/**
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
grammar Hive;

options
{
output=AST;
ASTLabelType=CommonTree;
backtrack=false;
k=3;
}

tokens {
TOK_INSERT;
TOK_QUERY;
TOK_SELECT;
TOK_SELECTDI;
TOK_SELEXPR;
TOK_FROM;
TOK_TAB;
TOK_PARTSPEC;
TOK_PARTVAL;
TOK_DIR;
TOK_LOCAL_DIR;
TOK_TABREF;
TOK_SUBQUERY;
TOK_DESTINATION;
TOK_ALLCOLREF;
TOK_TABLE_OR_COL;
TOK_FUNCTION;
TOK_FUNCTIONDI;
TOK_FUNCTIONSTAR;
TOK_WHERE;
TOK_OP_EQ;
TOK_OP_NE;
TOK_OP_LE;
TOK_OP_LT;
TOK_OP_GE;
TOK_OP_GT;
TOK_OP_DIV;
TOK_OP_ADD;
TOK_OP_SUB;
TOK_OP_MUL;
TOK_OP_MOD;
TOK_OP_BITAND;
TOK_OP_BITNOT;
TOK_OP_BITOR;
TOK_OP_BITXOR;
TOK_OP_AND;
TOK_OP_OR;
TOK_OP_NOT;
TOK_OP_LIKE;
TOK_TRUE;
TOK_FALSE;
TOK_TRANSFORM;
TOK_SERDE;
TOK_SERDENAME;
TOK_SERDEPROPS;
TOK_EXPLIST;
TOK_ALIASLIST;
TOK_GROUPBY;
TOK_HAVING;
TOK_ORDERBY;
TOK_CLUSTERBY;
TOK_DISTRIBUTEBY;
TOK_SORTBY;
TOK_UNION;
TOK_JOIN;
TOK_LEFTOUTERJOIN;
TOK_RIGHTOUTERJOIN;
TOK_FULLOUTERJOIN;
TOK_UNIQUEJOIN;
TOK_LOAD;
TOK_NULL;
TOK_ISNULL;
TOK_ISNOTNULL;
TOK_TINYINT;
TOK_SMALLINT;
TOK_INT;
TOK_BIGINT;
TOK_BOOLEAN;
TOK_FLOAT;
TOK_DOUBLE;
TOK_DATE;
TOK_DATETIME;
TOK_TIMESTAMP;
TOK_STRING;
TOK_LIST;
TOK_STRUCT;
TOK_MAP;
TOK_UNIONTYPE;
TOK_COLTYPELIST;
TOK_CREATEDATABASE;
TOK_CREATETABLE;
TOK_CREATEINDEX;
TOK_CREATEINDEX_INDEXTBLNAME;
TOK_DEFERRED_REBUILDINDEX;
TOK_DROPINDEX;
TOK_LIKETABLE;
TOK_DESCTABLE;
TOK_DESCFUNCTION;
TOK_ALTERTABLE_PARTITION;
TOK_ALTERTABLE_RENAME;
TOK_ALTERTABLE_ADDCOLS;
TOK_ALTERTABLE_RENAMECOL;
TOK_ALTERTABLE_REPLACECOLS;
TOK_ALTERTABLE_ADDPARTS;
TOK_ALTERTABLE_DROPPARTS;
TOK_ALTERTABLE_ALTERPARTS_PROTECTMODE;
TOK_ALTERTABLE_TOUCH;
TOK_ALTERTABLE_ARCHIVE;
TOK_ALTERTABLE_UNARCHIVE;
TOK_ALTERTABLE_SERDEPROPERTIES;
TOK_ALTERTABLE_SERIALIZER;
TOK_TABLE_PARTITION;
TOK_ALTERTABLE_FILEFORMAT;
TOK_ALTERTABLE_LOCATION;
TOK_ALTERTABLE_PROPERTIES;
TOK_ALTERTABLE_CHANGECOL_AFTER_POSITION;
TOK_ALTERINDEX_REBUILD;
TOK_ALTERINDEX_PROPERTIES;
TOK_MSCK;
TOK_SHOWDATABASES;
TOK_SHOWTABLES;
TOK_SHOWFUNCTIONS;
TOK_SHOWPARTITIONS;
TOK_SHOW_TABLESTATUS;
TOK_SHOWLOCKS;
TOK_LOCKTABLE;
TOK_UNLOCKTABLE;
TOK_SWITCHDATABASE;
TOK_DROPDATABASE;
TOK_DROPTABLE;
TOK_DATABASECOMMENT;
TOK_TABCOLLIST;
TOK_TABCOL;
TOK_TABLECOMMENT;
TOK_TABLEPARTCOLS;
TOK_TABLEBUCKETS;
TOK_TABLEROWFORMAT;
TOK_TABLEROWFORMATFIELD;
TOK_TABLEROWFORMATCOLLITEMS;
TOK_TABLEROWFORMATMAPKEYS;
TOK_TABLEROWFORMATLINES;
TOK_TBLSEQUENCEFILE;
TOK_TBLTEXTFILE;
TOK_TBLRCFILE;
TOK_TABLEFILEFORMAT;
TOK_FILEFORMAT_GENERIC;
TOK_OFFLINE;
TOK_ENABLE;
TOK_DISABLE;
TOK_READONLY;
TOK_NO_DROP;
TOK_STORAGEHANDLER;
TOK_ALTERTABLE_CLUSTER_SORT;
TOK_TABCOLNAME;
TOK_TABLELOCATION;
TOK_PARTITIONLOCATION;
TOK_TABLESAMPLE;
TOK_TMP_FILE;
TOK_TABSORTCOLNAMEASC;
TOK_TABSORTCOLNAMEDESC;
TOK_CHARSETLITERAL;
TOK_CREATEFUNCTION;
TOK_DROPFUNCTION;
TOK_CREATEVIEW;
TOK_DROPVIEW;
TOK_ALTERVIEW_PROPERTIES;
TOK_EXPLAIN;
TOK_TABLESERIALIZER;
TOK_TABLEPROPERTIES;
TOK_TABLEPROPLIST;
TOK_INDEXPROPERTIES;
TOK_INDEXPROPLIST;
TOK_TABTYPE;
TOK_LIMIT;
TOK_TABLEPROPERTY;
TOK_IFEXISTS;
TOK_IFNOTEXISTS;
TOK_HINTLIST;
TOK_HINT;
TOK_MAPJOIN;
TOK_STREAMTABLE;
TOK_HOLD_DDLTIME;
TOK_HINTARGLIST;
TOK_USERSCRIPTCOLNAMES;
TOK_USERSCRIPTCOLSCHEMA;
TOK_RECORDREADER;
TOK_RECORDWRITER;
TOK_LEFTSEMIJOIN;
TOK_LATERAL_VIEW;
TOK_TABALIAS;
TOK_ANALYZE;
TOK_CREATEROLE;
TOK_DROPROLE;
TOK_GRANT;
TOK_REVOKE;
TOK_SHOW_GRANT;
TOK_PRIVILEGE_LIST;
TOK_PRIVILEGE;
TOK_PRINCIPAL_NAME;
TOK_USER;
TOK_GROUP;
TOK_ROLE;
TOK_GRANT_WITH_OPTION;
TOK_PRIV_ALL;
TOK_PRIV_ALTER_METADATA;
TOK_PRIV_ALTER_DATA;
TOK_PRIV_DROP;
TOK_PRIV_INDEX;
TOK_PRIV_LOCK;
TOK_PRIV_SELECT;
TOK_PRIV_SHOW_DATABASE;
TOK_PRIV_CREATE;
TOK_PRIV_OBJECT;
TOK_PRIV_OBJECT_COL;
TOK_GRANT_ROLE;
TOK_REVOKE_ROLE;
TOK_SHOW_ROLE_GRANT;
TOK_SHOWINDEXES;
TOK_INDEXCOMMENT;
TOK_DESCDATABASE;
TOK_DATABASEPROPERTIES;
TOK_DBPROPLIST;
TOK_ALTERDATABASE_PROPERTIES;
TOK_TABNAME;
TOK_TABSRC;
}


// Package headers
@header {
package org.apache.hadoop.hive.ql.parse;
}
@lexer::header {package org.apache.hadoop.hive.ql.parse;}


@members {
  Stack msgs = new Stack<String>();
}

@rulecatch {
catch (RecognitionException e) {
 reportError(e);
  throw e;
}
}

// starting rule
statement
	: explainStatement EOF
	| execStatement EOF
	;

explainStatement
@init { msgs.push("explain statement"); }
@after { msgs.pop(); }
	: KW_EXPLAIN (isExtended=KW_EXTENDED)? execStatement -> ^(TOK_EXPLAIN execStatement $isExtended?)
	;

execStatement
@init { msgs.push("statement"); }
@after { msgs.pop(); }
    : queryStatementExpression
    | loadStatement
    | ddlStatement
    ;

loadStatement
@init { msgs.push("load statement"); }
@after { msgs.pop(); }
    : KW_LOAD KW_DATA (islocal=KW_LOCAL)? KW_INPATH (path=StringLiteral) (isoverwrite=KW_OVERWRITE)? KW_INTO KW_TABLE (tab=tableOrPartition)
    -> ^(TOK_LOAD $path $tab $islocal? $isoverwrite?)
    ;

ddlStatement
@init { msgs.push("ddl statement"); }
@after { msgs.pop(); }
    : createDatabaseStatement
    | switchDatabaseStatement
    | dropDatabaseStatement
    | createTableStatement
    | dropTableStatement
    | alterStatement
    | descStatement
    | showStatement
    | metastoreCheck
    | createViewStatement
    | dropViewStatement
    | createFunctionStatement
    | createIndexStatement
    | dropIndexStatement
    | dropFunctionStatement
    | analyzeStatement
    | lockStatement
    | unlockStatement
    | createRoleStatement
    | dropRoleStatement
    | grantPrivileges
    | revokePrivileges
    | showGrants
    | showRoleGrants
    | grantRole
    | revokeRole
    ;

ifExists
@init { msgs.push("if exists clause"); }
@after { msgs.pop(); }
    : KW_IF KW_EXISTS
    -> ^(TOK_IFEXISTS)
    ;

ifNotExists
@init { msgs.push("if not exists clause"); }
@after { msgs.pop(); }
    : KW_IF KW_NOT KW_EXISTS
    -> ^(TOK_IFNOTEXISTS)
    ;


createDatabaseStatement
@init { msgs.push("create database statement"); }
@after { msgs.pop(); }
    : KW_CREATE (KW_DATABASE|KW_SCHEMA)
        ifNotExists?
        name=Identifier
        databaseComment?
        (KW_WITH KW_DBPROPERTIES dbprops=dbProperties)?
    -> ^(TOK_CREATEDATABASE $name ifNotExists? databaseComment? $dbprops?)
    ;

dbProperties
@init { msgs.push("dbproperties"); }
@after { msgs.pop(); }
    :
      LPAREN dbPropertiesList RPAREN -> ^(TOK_DATABASEPROPERTIES dbPropertiesList)
    ;

dbPropertiesList
@init { msgs.push("database properties list"); }
@after { msgs.pop(); }
    :
      keyValueProperty (COMMA keyValueProperty)* -> ^(TOK_DBPROPLIST keyValueProperty+)
    ;

 
switchDatabaseStatement
@init { msgs.push("switch database statement"); }
@after { msgs.pop(); }
    : KW_USE Identifier
    -> ^(TOK_SWITCHDATABASE Identifier)
    ;

dropDatabaseStatement
@init { msgs.push("drop database statement"); }
@after { msgs.pop(); }
    : KW_DROP (KW_DATABASE|KW_SCHEMA) ifExists? Identifier
    -> ^(TOK_DROPDATABASE Identifier ifExists?)
    ;

databaseComment
@init { msgs.push("database's comment"); }
@after { msgs.pop(); }
    : KW_COMMENT comment=StringLiteral
    -> ^(TOK_DATABASECOMMENT $comment)
    ;

createTableStatement
@init { msgs.push("create table statement"); }
@after { msgs.pop(); }
    : KW_CREATE (ext=KW_EXTERNAL)? KW_TABLE ifNotExists? name=tableName
      (  like=KW_LIKE likeName=tableName
         tableLocation?
       | (LPAREN columnNameTypeList RPAREN)?
         tableComment?
         tablePartition?
         tableBuckets?
         tableRowFormat?
         tableFileFormat?
         tableLocation?
         tablePropertiesPrefixed?
         (KW_AS selectStatement)?
      )
    -> ^(TOK_CREATETABLE $name $ext? ifNotExists?
         ^(TOK_LIKETABLE $likeName?)
         columnNameTypeList?
         tableComment?
         tablePartition?
         tableBuckets?
         tableRowFormat?
         tableFileFormat?
         tableLocation?
         tablePropertiesPrefixed?
         selectStatement?
        )
    ;

createIndexStatement
@init { msgs.push("create index statement");}
@after {msgs.pop();}
    : KW_CREATE KW_INDEX indexName=Identifier
      KW_ON KW_TABLE tab=tableName LPAREN indexedCols=columnNameList RPAREN
      KW_AS typeName=StringLiteral
      autoRebuild?
      indexPropertiesPrefixed?
      indexTblName?
      tableRowFormat?
      tableFileFormat?
      tableLocation?
      tablePropertiesPrefixed?
      indexComment?
    ->^(TOK_CREATEINDEX $indexName $typeName $tab $indexedCols 
        autoRebuild?
        indexPropertiesPrefixed?
        indexTblName?
        tableRowFormat?
        tableFileFormat?
        tableLocation?
        tablePropertiesPrefixed?
        indexComment?)
    ;

indexComment
@init { msgs.push("comment on an index");}
@after {msgs.pop();}
        :
                KW_COMMENT comment=StringLiteral  -> ^(TOK_INDEXCOMMENT $comment)
        ;

autoRebuild
@init { msgs.push("auto rebuild index");}
@after {msgs.pop();}
    : KW_WITH KW_DEFERRED KW_REBUILD
    ->^(TOK_DEFERRED_REBUILDINDEX)
    ;

indexTblName
@init { msgs.push("index table name");}
@after {msgs.pop();}
    : KW_IN KW_TABLE indexTbl=tableName
    ->^(TOK_CREATEINDEX_INDEXTBLNAME $indexTbl)
    ;

indexPropertiesPrefixed
@init { msgs.push("table properties with prefix"); }
@after { msgs.pop(); }
    :
        KW_IDXPROPERTIES! indexProperties
    ;

indexProperties
@init { msgs.push("index properties"); }
@after { msgs.pop(); }
    :
      LPAREN indexPropertiesList RPAREN -> ^(TOK_INDEXPROPERTIES indexPropertiesList)
    ;

indexPropertiesList
@init { msgs.push("index properties list"); }
@after { msgs.pop(); }
    :
      keyValueProperty (COMMA keyValueProperty)* -> ^(TOK_INDEXPROPLIST keyValueProperty+)
    ;

dropIndexStatement
@init { msgs.push("drop index statement");}
@after {msgs.pop();}
    : KW_DROP KW_INDEX ifExists? indexName=Identifier KW_ON tab=tableName
    ->^(TOK_DROPINDEX $indexName $tab ifExists?)
    ;

dropTableStatement
@init { msgs.push("drop statement"); }
@after { msgs.pop(); }
    : KW_DROP KW_TABLE ifExists? tableName -> ^(TOK_DROPTABLE tableName ifExists?)
    ;

alterStatement
@init { msgs.push("alter statement"); }
@after { msgs.pop(); }
    : KW_ALTER!
        (
            KW_TABLE! alterTableStatementSuffix
        |
            KW_VIEW! alterViewStatementSuffix
        |
            KW_INDEX! alterIndexStatementSuffix
        |
            KW_DATABASE! alterDatabaseStatementSuffix
        )
    ;

alterTableStatementSuffix
@init { msgs.push("alter table statement"); }
@after { msgs.pop(); }
    : alterStatementSuffixRename
    | alterStatementSuffixAddCol
    | alterStatementSuffixRenameCol
    | alterStatementSuffixDropPartitions
    | alterStatementSuffixAddPartitions
    | alterStatementSuffixTouch
    | alterStatementSuffixArchive
    | alterStatementSuffixUnArchive
    | alterStatementSuffixProperties
    | alterStatementSuffixSerdeProperties
    | alterTblPartitionStatement
    | alterStatementSuffixClusterbySortby
    ;

alterViewStatementSuffix
@init { msgs.push("alter view statement"); }
@after { msgs.pop(); }
    : alterViewSuffixProperties
    ;

alterIndexStatementSuffix
@init { msgs.push("alter index statement"); }
@after { msgs.pop(); }
    : indexName=Identifier
      (KW_ON tableNameId=Identifier)
      partitionSpec?
    (
      KW_REBUILD
      ->^(TOK_ALTERINDEX_REBUILD $tableNameId $indexName partitionSpec?)
    |
      KW_SET KW_IDXPROPERTIES
      indexProperties
      ->^(TOK_ALTERINDEX_PROPERTIES $tableNameId $indexName indexProperties)
    )
    ;

alterDatabaseStatementSuffix
@init { msgs.push("alter database statement"); }
@after { msgs.pop(); }
    : alterDatabaseSuffixProperties
    ;
    
alterDatabaseSuffixProperties
@init { msgs.push("alter database properties statement"); }
@after { msgs.pop(); }
    : name=Identifier KW_SET KW_DBPROPERTIES dbProperties
    -> ^(TOK_ALTERDATABASE_PROPERTIES $name dbProperties)
    ;

alterStatementSuffixRename
@init { msgs.push("rename statement"); }
@after { msgs.pop(); }
    : oldName=Identifier KW_RENAME KW_TO newName=Identifier
    -> ^(TOK_ALTERTABLE_RENAME $oldName $newName)
    ;

alterStatementSuffixAddCol
@init { msgs.push("add column statement"); }
@after { msgs.pop(); }
    : Identifier (add=KW_ADD | replace=KW_REPLACE) KW_COLUMNS LPAREN columnNameTypeList RPAREN
    -> {$add != null}? ^(TOK_ALTERTABLE_ADDCOLS Identifier columnNameTypeList)
    ->                 ^(TOK_ALTERTABLE_REPLACECOLS Identifier columnNameTypeList)
    ;

alterStatementSuffixRenameCol
@init { msgs.push("rename column name"); }
@after { msgs.pop(); }
    : Identifier KW_CHANGE KW_COLUMN? oldName=Identifier newName=Identifier colType (KW_COMMENT comment=StringLiteral)? alterStatementChangeColPosition?
    ->^(TOK_ALTERTABLE_RENAMECOL Identifier $oldName $newName colType $comment? alterStatementChangeColPosition?)
    ;

alterStatementChangeColPosition
    : first=KW_FIRST|KW_AFTER afterCol=Identifier
    ->{$first != null}? ^(TOK_ALTERTABLE_CHANGECOL_AFTER_POSITION )
    -> ^(TOK_ALTERTABLE_CHANGECOL_AFTER_POSITION $afterCol)
    ;

alterStatementSuffixAddPartitions
@init { msgs.push("add partition statement"); }
@after { msgs.pop(); }
    : Identifier KW_ADD ifNotExists? partitionSpec partitionLocation? (partitionSpec partitionLocation?)*
    -> ^(TOK_ALTERTABLE_ADDPARTS Identifier ifNotExists? (partitionSpec partitionLocation?)+)
    ;

alterStatementSuffixTouch
@init { msgs.push("touch statement"); }
@after { msgs.pop(); }
    : Identifier KW_TOUCH (partitionSpec)*
    -> ^(TOK_ALTERTABLE_TOUCH Identifier (partitionSpec)*)
    ;

alterStatementSuffixArchive
@init { msgs.push("archive statement"); }
@after { msgs.pop(); }
    : Identifier KW_ARCHIVE (partitionSpec)*
    -> ^(TOK_ALTERTABLE_ARCHIVE Identifier (partitionSpec)*)
    ;

alterStatementSuffixUnArchive
@init { msgs.push("unarchive statement"); }
@after { msgs.pop(); }
    : Identifier KW_UNARCHIVE (partitionSpec)*
    -> ^(TOK_ALTERTABLE_UNARCHIVE Identifier (partitionSpec)*)
    ;

partitionLocation
@init { msgs.push("partition location"); }
@after { msgs.pop(); }
    :
      KW_LOCATION locn=StringLiteral -> ^(TOK_PARTITIONLOCATION $locn)
    ;

alterStatementSuffixDropPartitions
@init { msgs.push("drop partition statement"); }
@after { msgs.pop(); }
    : Identifier KW_DROP ifExists? partitionSpec (COMMA partitionSpec)*
    -> ^(TOK_ALTERTABLE_DROPPARTS Identifier partitionSpec+ ifExists?)
    ;

alterStatementSuffixProperties
@init { msgs.push("alter properties statement"); }
@after { msgs.pop(); }
    : name=Identifier KW_SET KW_TBLPROPERTIES tableProperties
    -> ^(TOK_ALTERTABLE_PROPERTIES $name tableProperties)
    ;

alterViewSuffixProperties
@init { msgs.push("alter view properties statement"); }
@after { msgs.pop(); }
    : name=Identifier KW_SET KW_TBLPROPERTIES tableProperties
    -> ^(TOK_ALTERVIEW_PROPERTIES $name tableProperties)
    ;

alterStatementSuffixSerdeProperties
@init { msgs.push("alter serdes statement"); }
@after { msgs.pop(); }
    : name=Identifier KW_SET KW_SERDE serdeName=StringLiteral (KW_WITH KW_SERDEPROPERTIES tableProperties)?
    -> ^(TOK_ALTERTABLE_SERIALIZER $name $serdeName tableProperties?)
    | name=Identifier KW_SET KW_SERDEPROPERTIES tableProperties
    -> ^(TOK_ALTERTABLE_SERDEPROPERTIES $name tableProperties)
    ;

tablePartitionPrefix
@init {msgs.push("table partition prefix");}
@after {msgs.pop();}
  :name=Identifier partitionSpec?
  ->^(TOK_TABLE_PARTITION $name partitionSpec?)
  ;

alterTblPartitionStatement
@init {msgs.push("alter table partition statement");}
@after {msgs.pop();}
  :  tablePartitionPrefix alterTblPartitionStatementSuffix
  -> ^(TOK_ALTERTABLE_PARTITION tablePartitionPrefix alterTblPartitionStatementSuffix)
  ;

alterTblPartitionStatementSuffix
@init {msgs.push("alter table partition statement suffix");}
@after {msgs.pop();}
  : alterStatementSuffixFileFormat
  | alterStatementSuffixLocation
  | alterStatementSuffixProtectMode
  ;

alterStatementSuffixFileFormat
@init {msgs.push("alter fileformat statement"); }
@after {msgs.pop();}
	: KW_SET KW_FILEFORMAT fileFormat
	-> ^(TOK_ALTERTABLE_FILEFORMAT fileFormat)
	;

alterStatementSuffixLocation
@init {msgs.push("alter location");}
@after {msgs.pop();}
  : KW_SET KW_LOCATION newLoc=StringLiteral
  -> ^(TOK_ALTERTABLE_LOCATION $newLoc)
  ;

alterStatementSuffixProtectMode
@init { msgs.push("alter partition protect mode statement"); }
@after { msgs.pop(); }
    : alterProtectMode
    -> ^(TOK_ALTERTABLE_ALTERPARTS_PROTECTMODE alterProtectMode)
    ;

alterProtectMode
@init { msgs.push("protect mode specification enable"); }
@after { msgs.pop(); }
    : KW_ENABLE alterProtectModeMode  -> ^(TOK_ENABLE alterProtectModeMode)
    | KW_DISABLE alterProtectModeMode  -> ^(TOK_DISABLE alterProtectModeMode)
    ;

alterProtectModeMode
@init { msgs.push("protect mode specification enable"); }
@after { msgs.pop(); }
    : KW_OFFLINE  -> ^(TOK_OFFLINE)
    | KW_NO_DROP  -> ^(TOK_NO_DROP)
    | KW_READONLY  -> ^(TOK_READONLY)
    ;


alterStatementSuffixClusterbySortby
@init {msgs.push("alter cluster by sort by statement");}
@after{msgs.pop();}
	:name=Identifier tableBuckets
	->^(TOK_ALTERTABLE_CLUSTER_SORT $name tableBuckets)
	|
	name=Identifier KW_NOT KW_CLUSTERED
	->^(TOK_ALTERTABLE_CLUSTER_SORT $name)
	;

fileFormat
@init { msgs.push("file format specification"); }
@after { msgs.pop(); }
    : KW_SEQUENCEFILE  -> ^(TOK_TBLSEQUENCEFILE)
    | KW_TEXTFILE  -> ^(TOK_TBLTEXTFILE)
    | KW_RCFILE  -> ^(TOK_TBLRCFILE)
    | KW_INPUTFORMAT inFmt=StringLiteral KW_OUTPUTFORMAT outFmt=StringLiteral (KW_INPUTDRIVER inDriver=StringLiteral KW_OUTPUTDRIVER outDriver=StringLiteral)?
      -> ^(TOK_TABLEFILEFORMAT $inFmt $outFmt $inDriver? $outDriver?)
    | genericSpec=Identifier -> ^(TOK_FILEFORMAT_GENERIC $genericSpec)
    ;

tabTypeExpr
@init { msgs.push("specifying table types"); }
@after { msgs.pop(); }

   : Identifier (DOT^ (Identifier | KW_ELEM_TYPE | KW_KEY_TYPE | KW_VALUE_TYPE))*
   ;

partTypeExpr
@init { msgs.push("specifying table partitions"); }
@after { msgs.pop(); }
    :  tabTypeExpr partitionSpec? -> ^(TOK_TABTYPE tabTypeExpr partitionSpec?)
    ;

descStatement
@init { msgs.push("describe statement"); }
@after { msgs.pop(); }
    : (KW_DESCRIBE|KW_DESC) (descOptions=KW_FORMATTED|descOptions=KW_EXTENDED)? (parttype=partTypeExpr) -> ^(TOK_DESCTABLE $parttype $descOptions?)
    | (KW_DESCRIBE|KW_DESC) KW_FUNCTION KW_EXTENDED? (name=descFuncNames) -> ^(TOK_DESCFUNCTION $name KW_EXTENDED?)
    | (KW_DESCRIBE|KW_DESC) KW_DATABASE KW_EXTENDED? (dbName=Identifier) -> ^(TOK_DESCDATABASE $dbName KW_EXTENDED?)
    ;

analyzeStatement
@init { msgs.push("analyze statement"); }
@after { msgs.pop(); }
    : KW_ANALYZE KW_TABLE (parttype=tableOrPartition) KW_COMPUTE KW_STATISTICS -> ^(TOK_ANALYZE $parttype)
    ;

showStatement
@init { msgs.push("show statement"); }
@after { msgs.pop(); }
    : KW_SHOW (KW_DATABASES|KW_SCHEMAS) (KW_LIKE showStmtIdentifier)? -> ^(TOK_SHOWDATABASES showStmtIdentifier?)
    | KW_SHOW KW_TABLES ((KW_FROM|KW_IN) db_name=Identifier)? (KW_LIKE showStmtIdentifier|showStmtIdentifier)?  -> ^(TOK_SHOWTABLES (TOK_FROM $db_name)? showStmtIdentifier?)
    | KW_SHOW KW_FUNCTIONS showStmtIdentifier?  -> ^(TOK_SHOWFUNCTIONS showStmtIdentifier?)
    | KW_SHOW KW_PARTITIONS Identifier partitionSpec? -> ^(TOK_SHOWPARTITIONS Identifier partitionSpec?)
    | KW_SHOW KW_TABLE KW_EXTENDED ((KW_FROM|KW_IN) db_name=Identifier)? KW_LIKE showStmtIdentifier partitionSpec?
    -> ^(TOK_SHOW_TABLESTATUS showStmtIdentifier $db_name? partitionSpec?)
    | KW_SHOW KW_LOCKS (parttype=partTypeExpr)? (isExtended=KW_EXTENDED)? -> ^(TOK_SHOWLOCKS $parttype? $isExtended?)
    | KW_SHOW (showOptions=KW_FORMATTED)? (KW_INDEX|KW_INDEXES) KW_ON showStmtIdentifier ((KW_FROM|KW_IN) db_name=Identifier)?
    -> ^(TOK_SHOWINDEXES showStmtIdentifier $showOptions? $db_name?)  
    ;

lockStatement
@init { msgs.push("lock statement"); }
@after { msgs.pop(); }
    : KW_LOCK KW_TABLE tableName partitionSpec? lockMode -> ^(TOK_LOCKTABLE tableName lockMode partitionSpec?)
    ;

lockMode
@init { msgs.push("lock mode"); }
@after { msgs.pop(); }
    : KW_SHARED | KW_EXCLUSIVE
    ;

unlockStatement
@init { msgs.push("unlock statement"); }
@after { msgs.pop(); }
    : KW_UNLOCK KW_TABLE tableName partitionSpec?  -> ^(TOK_UNLOCKTABLE tableName partitionSpec?)
    ;

createRoleStatement
@init { msgs.push("create role"); }
@after { msgs.pop(); }
    : KW_CREATE kwRole roleName=Identifier
    -> ^(TOK_CREATEROLE $roleName)
    ;

dropRoleStatement
@init {msgs.push("drop role");}
@after {msgs.pop();}
    : KW_DROP kwRole roleName=Identifier
    -> ^(TOK_DROPROLE $roleName)
    ;

grantPrivileges
@init {msgs.push("grant privileges");}
@after {msgs.pop();}
    : KW_GRANT privList=privilegeList 
      privilegeObject?
      KW_TO principalSpecification
      (KW_WITH withOption)?
    -> ^(TOK_GRANT $privList principalSpecification privilegeObject? withOption?)
    ;

revokePrivileges
@init {msgs.push("revoke privileges");}
@afer {msgs.pop();}
    : KW_REVOKE privilegeList privilegeObject? KW_FROM principalSpecification
    -> ^(TOK_REVOKE privilegeList principalSpecification privilegeObject?)
    ;

grantRole
@init {msgs.push("grant role");}
@after {msgs.pop();}
    : KW_GRANT kwRole Identifier (COMMA Identifier)* KW_TO principalSpecification
    -> ^(TOK_GRANT_ROLE principalSpecification Identifier+)
    ;

revokeRole
@init {msgs.push("revoke role");}
@after {msgs.pop();}
    : KW_REVOKE kwRole Identifier (COMMA Identifier)* KW_FROM principalSpecification
    -> ^(TOK_REVOKE_ROLE principalSpecification Identifier+)
    ;

showRoleGrants
@init {msgs.push("show role grants");}
@after {msgs.pop();}
    : KW_SHOW kwRole KW_GRANT principalName
    -> ^(TOK_SHOW_ROLE_GRANT principalName)
    ;

showGrants
@init {msgs.push("show grants");}
@after {msgs.pop();}
    : KW_SHOW KW_GRANT principalName privilegeIncludeColObject?
    -> ^(TOK_SHOW_GRANT principalName privilegeIncludeColObject?)
    ;

privilegeIncludeColObject
@init {msgs.push("privilege object including columns");}
@after {msgs.pop();}
    : KW_ON (table=KW_TABLE|KW_DATABASE) Identifier (LPAREN cols=columnNameList RPAREN)? partitionSpec?
    -> ^(TOK_PRIV_OBJECT_COL Identifier $table? $cols? partitionSpec?)
    ;

privilegeObject
@init {msgs.push("privilege subject");}
@after {msgs.pop();}
    : KW_ON (table=KW_TABLE|KW_DATABASE) Identifier partitionSpec?
    -> ^(TOK_PRIV_OBJECT Identifier $table? partitionSpec?)
    ;

privilegeList
@init {msgs.push("grant privilege list");}
@after {msgs.pop();}
    : privlegeDef (COMMA privlegeDef)* 
    -> ^(TOK_PRIVILEGE_LIST privlegeDef+)
    ;

privlegeDef
@init {msgs.push("grant privilege");}
@after {msgs.pop();}
    : privilegeType (LPAREN cols=columnNameList RPAREN)?
    -> ^(TOK_PRIVILEGE privilegeType $cols?)
    ;
    
privilegeType
@init {msgs.push("privilege type");}
@after {msgs.pop();}
    : KW_ALL -> ^(TOK_PRIV_ALL)
    | KW_ALTER -> ^(TOK_PRIV_ALTER_METADATA)
    | KW_UPDATE -> ^(TOK_PRIV_ALTER_DATA)
    | KW_CREATE -> ^(TOK_PRIV_CREATE)
    | KW_DROP -> ^(TOK_PRIV_DROP)
    | KW_INDEX -> ^(TOK_PRIV_INDEX)
    | KW_LOCK -> ^(TOK_PRIV_LOCK)
    | KW_SELECT -> ^(TOK_PRIV_SELECT)
    | KW_SHOW_DATABASE -> ^(TOK_PRIV_SHOW_DATABASE)
    ;

principalSpecification
@init { msgs.push("user/group/role name list"); }
@after { msgs.pop(); }
    : principalName (COMMA principalName)* -> ^(TOK_PRINCIPAL_NAME principalName+)
    ;

principalName
@init {msgs.push("user|group|role name");}
@after {msgs.pop();}
    : kwUser Identifier -> ^(TOK_USER Identifier)
    | KW_GROUP Identifier -> ^(TOK_GROUP Identifier)
    | kwRole Identifier -> ^(TOK_ROLE Identifier)
    ;

withOption
@init {msgs.push("grant with option");}
@after {msgs.pop();}
    : KW_GRANT KW_OPTION
    -> ^(TOK_GRANT_WITH_OPTION)
    ;

metastoreCheck
@init { msgs.push("metastore check statement"); }
@after { msgs.pop(); }
    : KW_MSCK (repair=KW_REPAIR)? (KW_TABLE table=Identifier partitionSpec? (COMMA partitionSpec)*)?
    -> ^(TOK_MSCK $repair? ($table partitionSpec*)?)
    ;

createFunctionStatement
@init { msgs.push("create function statement"); }
@after { msgs.pop(); }
    : KW_CREATE KW_TEMPORARY KW_FUNCTION Identifier KW_AS StringLiteral
    -> ^(TOK_CREATEFUNCTION Identifier StringLiteral)
    ;

dropFunctionStatement
@init { msgs.push("drop temporary function statement"); }
@after { msgs.pop(); }
    : KW_DROP KW_TEMPORARY KW_FUNCTION ifExists? Identifier
    -> ^(TOK_DROPFUNCTION Identifier ifExists?)
    ;

createViewStatement
@init {
    msgs.push("create view statement");
}
@after { msgs.pop(); }
    : KW_CREATE KW_VIEW ifNotExists? name=tableName
        (LPAREN columnNameCommentList RPAREN)? tableComment?
        tablePropertiesPrefixed?
        KW_AS
        selectStatement
    -> ^(TOK_CREATEVIEW $name ifNotExists?
         columnNameCommentList?
         tableComment?
         tablePropertiesPrefixed?
         selectStatement
        )
    ;

dropViewStatement
@init { msgs.push("drop view statement"); }
@after { msgs.pop(); }
    : KW_DROP KW_VIEW ifExists? viewName -> ^(TOK_DROPVIEW viewName ifExists?)
    ;

showStmtIdentifier
@init { msgs.push("Identifier for show statement"); }
@after { msgs.pop(); }
    : Identifier
    | StringLiteral
    ;

tableComment
@init { msgs.push("table's comment"); }
@after { msgs.pop(); }
    :
      KW_COMMENT comment=StringLiteral  -> ^(TOK_TABLECOMMENT $comment)
    ;

tablePartition
@init { msgs.push("table partition specification"); }
@after { msgs.pop(); }
    : KW_PARTITIONED KW_BY LPAREN columnNameTypeList RPAREN
    -> ^(TOK_TABLEPARTCOLS columnNameTypeList)
    ;

tableBuckets
@init { msgs.push("table buckets specification"); }
@after { msgs.pop(); }
    :
      KW_CLUSTERED KW_BY LPAREN bucketCols=columnNameList RPAREN (KW_SORTED KW_BY LPAREN sortCols=columnNameOrderList RPAREN)? KW_INTO num=Number KW_BUCKETS
    -> ^(TOK_TABLEBUCKETS $bucketCols $sortCols? $num)
    ;

rowFormat
@init { msgs.push("serde specification"); }
@after { msgs.pop(); }
    : rowFormatSerde -> ^(TOK_SERDE rowFormatSerde)
    | rowFormatDelimited -> ^(TOK_SERDE rowFormatDelimited)
    |   -> ^(TOK_SERDE)
    ;

recordReader
@init { msgs.push("record reader specification"); }
@after { msgs.pop(); }
    : KW_RECORDREADER StringLiteral -> ^(TOK_RECORDREADER StringLiteral)
    |   -> ^(TOK_RECORDREADER)
    ;

recordWriter
@init { msgs.push("record writer specification"); }
@after { msgs.pop(); }
    : KW_RECORDWRITER StringLiteral -> ^(TOK_RECORDWRITER StringLiteral)
    |   -> ^(TOK_RECORDWRITER)
    ;

rowFormatSerde
@init { msgs.push("serde format specification"); }
@after { msgs.pop(); }
    : KW_ROW KW_FORMAT KW_SERDE name=StringLiteral (KW_WITH KW_SERDEPROPERTIES serdeprops=tableProperties)?
    -> ^(TOK_SERDENAME $name $serdeprops?)
    ;

rowFormatDelimited
@init { msgs.push("serde properties specification"); }
@after { msgs.pop(); }
    :
      KW_ROW KW_FORMAT KW_DELIMITED tableRowFormatFieldIdentifier? tableRowFormatCollItemsIdentifier? tableRowFormatMapKeysIdentifier? tableRowFormatLinesIdentifier?
    -> ^(TOK_SERDEPROPS tableRowFormatFieldIdentifier? tableRowFormatCollItemsIdentifier? tableRowFormatMapKeysIdentifier? tableRowFormatLinesIdentifier?)
    ;

tableRowFormat
@init { msgs.push("table row format specification"); }
@after { msgs.pop(); }
    :
      rowFormatDelimited
    -> ^(TOK_TABLEROWFORMAT rowFormatDelimited)
    | rowFormatSerde
    -> ^(TOK_TABLESERIALIZER rowFormatSerde)
    ;

tablePropertiesPrefixed
@init { msgs.push("table properties with prefix"); }
@after { msgs.pop(); }
    :
        KW_TBLPROPERTIES! tableProperties
    ;

tableProperties
@init { msgs.push("table properties"); }
@after { msgs.pop(); }
    :
      LPAREN tablePropertiesList RPAREN -> ^(TOK_TABLEPROPERTIES tablePropertiesList)
    ;

tablePropertiesList
@init { msgs.push("table properties list"); }
@after { msgs.pop(); }
    :
      keyValueProperty (COMMA keyValueProperty)* -> ^(TOK_TABLEPROPLIST keyValueProperty+)
    ;

keyValueProperty
@init { msgs.push("specifying key/value property"); }
@after { msgs.pop(); }
    :
      key=StringLiteral EQUAL value=StringLiteral -> ^(TOK_TABLEPROPERTY $key $value)
    ;

tableRowFormatFieldIdentifier
@init { msgs.push("table row format's field separator"); }
@after { msgs.pop(); }
    :
      KW_FIELDS KW_TERMINATED KW_BY fldIdnt=StringLiteral (KW_ESCAPED KW_BY fldEscape=StringLiteral)?
    -> ^(TOK_TABLEROWFORMATFIELD $fldIdnt $fldEscape?)
    ;

tableRowFormatCollItemsIdentifier
@init { msgs.push("table row format's column separator"); }
@after { msgs.pop(); }
    :
      KW_COLLECTION KW_ITEMS KW_TERMINATED KW_BY collIdnt=StringLiteral
    -> ^(TOK_TABLEROWFORMATCOLLITEMS $collIdnt)
    ;

tableRowFormatMapKeysIdentifier
@init { msgs.push("table row format's map key separator"); }
@after { msgs.pop(); }
    :
      KW_MAP KW_KEYS KW_TERMINATED KW_BY mapKeysIdnt=StringLiteral
    -> ^(TOK_TABLEROWFORMATMAPKEYS $mapKeysIdnt)
    ;

tableRowFormatLinesIdentifier
@init { msgs.push("table row format's line separator"); }
@after { msgs.pop(); }
    :
      KW_LINES KW_TERMINATED KW_BY linesIdnt=StringLiteral
    -> ^(TOK_TABLEROWFORMATLINES $linesIdnt)
    ;

tableFileFormat
@init { msgs.push("table file format specification"); }
@after { msgs.pop(); }
    :
      KW_STORED KW_AS KW_SEQUENCEFILE  -> TOK_TBLSEQUENCEFILE
      | KW_STORED KW_AS KW_TEXTFILE  -> TOK_TBLTEXTFILE
      | KW_STORED KW_AS KW_RCFILE  -> TOK_TBLRCFILE
      | KW_STORED KW_AS KW_INPUTFORMAT inFmt=StringLiteral KW_OUTPUTFORMAT outFmt=StringLiteral (KW_INPUTDRIVER inDriver=StringLiteral KW_OUTPUTDRIVER outDriver=StringLiteral)?
      -> ^(TOK_TABLEFILEFORMAT $inFmt $outFmt $inDriver? $outDriver?)
      | KW_STORED KW_BY storageHandler=StringLiteral
         (KW_WITH KW_SERDEPROPERTIES serdeprops=tableProperties)?
      -> ^(TOK_STORAGEHANDLER $storageHandler $serdeprops?)
      | KW_STORED KW_AS genericSpec=Identifier
      -> ^(TOK_FILEFORMAT_GENERIC $genericSpec)
    ;

tableLocation
@init { msgs.push("table location specification"); }
@after { msgs.pop(); }
    :
      KW_LOCATION locn=StringLiteral -> ^(TOK_TABLELOCATION $locn)
    ;

columnNameTypeList
@init { msgs.push("column name type list"); }
@after { msgs.pop(); }
    : columnNameType (COMMA columnNameType)* -> ^(TOK_TABCOLLIST columnNameType+)
    ;

columnNameColonTypeList
@init { msgs.push("column name type list"); }
@after { msgs.pop(); }
    : columnNameColonType (COMMA columnNameColonType)* -> ^(TOK_TABCOLLIST columnNameColonType+)
    ;

columnNameList
@init { msgs.push("column name list"); }
@after { msgs.pop(); }
    : columnName (COMMA columnName)* -> ^(TOK_TABCOLNAME columnName+)
    ;

columnName
@init { msgs.push("column name"); }
@after { msgs.pop(); }
    :
      Identifier
    ;

columnNameOrderList
@init { msgs.push("column name order list"); }
@after { msgs.pop(); }
    : columnNameOrder (COMMA columnNameOrder)* -> ^(TOK_TABCOLNAME columnNameOrder+)
    ;

columnNameOrder
@init { msgs.push("column name order"); }
@after { msgs.pop(); }
    : Identifier (asc=KW_ASC | desc=KW_DESC)?
    -> {$desc == null}? ^(TOK_TABSORTCOLNAMEASC Identifier)
    ->                  ^(TOK_TABSORTCOLNAMEDESC Identifier)
    ;

columnNameCommentList
@init { msgs.push("column name comment list"); }
@after { msgs.pop(); }
    : columnNameComment (COMMA columnNameComment)* -> ^(TOK_TABCOLNAME columnNameComment+)
    ;

columnNameComment
@init { msgs.push("column name comment"); }
@after { msgs.pop(); }
    : colName=Identifier (KW_COMMENT comment=StringLiteral)?
    -> ^(TOK_TABCOL $colName TOK_NULL $comment?)
    ;

columnRefOrder
@init { msgs.push("column order"); }
@after { msgs.pop(); }
    : expression (asc=KW_ASC | desc=KW_DESC)?
    -> {$desc == null}? ^(TOK_TABSORTCOLNAMEASC expression)
    ->                  ^(TOK_TABSORTCOLNAMEDESC expression)
    ;

columnNameType
@init { msgs.push("column specification"); }
@after { msgs.pop(); }
    : colName=Identifier colType (KW_COMMENT comment=StringLiteral)?
    -> {$comment == null}? ^(TOK_TABCOL $colName colType)
    ->                     ^(TOK_TABCOL $colName colType $comment)
    ;

columnNameColonType
@init { msgs.push("column specification"); }
@after { msgs.pop(); }
    : colName=Identifier COLON colType (KW_COMMENT comment=StringLiteral)?
    -> {$comment == null}? ^(TOK_TABCOL $colName colType)
    ->                     ^(TOK_TABCOL $colName colType $comment)
    ;

colType
@init { msgs.push("column type"); }
@after { msgs.pop(); }
    : type
    ;

colTypeList
@init { msgs.push("column type list"); }
@after { msgs.pop(); }
    : colType (COMMA colType)* -> ^(TOK_COLTYPELIST colType+)
    ;

type
    : primitiveType
    | listType
    | structType
    | mapType
    | unionType;

primitiveType
@init { msgs.push("primitive type specification"); }
@after { msgs.pop(); }
    : KW_TINYINT       ->    TOK_TINYINT
    | KW_SMALLINT      ->    TOK_SMALLINT
    | KW_INT           ->    TOK_INT
    | KW_BIGINT        ->    TOK_BIGINT
    | KW_BOOLEAN       ->    TOK_BOOLEAN
    | KW_FLOAT         ->    TOK_FLOAT
    | KW_DOUBLE        ->    TOK_DOUBLE
    | KW_DATE          ->    TOK_DATE
    | KW_DATETIME      ->    TOK_DATETIME
    | KW_TIMESTAMP     ->    TOK_TIMESTAMP
    | KW_STRING        ->    TOK_STRING
    ;

listType
@init { msgs.push("list type"); }
@after { msgs.pop(); }
    : KW_ARRAY LESSTHAN type GREATERTHAN   -> ^(TOK_LIST type)
    ;

structType
@init { msgs.push("struct type"); }
@after { msgs.pop(); }
    : KW_STRUCT LESSTHAN columnNameColonTypeList GREATERTHAN -> ^(TOK_STRUCT columnNameColonTypeList)
    ;

mapType
@init { msgs.push("map type"); }
@after { msgs.pop(); }
    : KW_MAP LESSTHAN left=primitiveType COMMA right=type GREATERTHAN
    -> ^(TOK_MAP $left $right)
    ;

unionType
@init { msgs.push("uniontype type"); }
@after { msgs.pop(); }
    : KW_UNIONTYPE LESSTHAN colTypeList GREATERTHAN -> ^(TOK_UNIONTYPE colTypeList)
    ;

queryOperator
@init { msgs.push("query operator"); }
@after { msgs.pop(); }
    : KW_UNION KW_ALL -> ^(TOK_UNION)
    ;

// select statement select ... from ... where ... group by ... order by ...
queryStatementExpression
    : queryStatement (queryOperator^ queryStatement)*
    ;

queryStatement
    :
    fromClause
    ( b+=body )+ -> ^(TOK_QUERY fromClause body+)
    | regular_body
    ;

regular_body
   :
   insertClause
   selectClause
   fromClause
   whereClause?
   groupByClause?
   havingClause?
   orderByClause?
   clusterByClause?
   distributeByClause?
   sortByClause?
   limitClause? -> ^(TOK_QUERY fromClause ^(TOK_INSERT insertClause
                     selectClause whereClause? groupByClause? havingClause? orderByClause? clusterByClause?
                     distributeByClause? sortByClause? limitClause?))
   |
   selectStatement
   ;

selectStatement
   :
   selectClause
   fromClause
   whereClause?
   groupByClause?
   havingClause?
   orderByClause?
   clusterByClause?
   distributeByClause?
   sortByClause?
   limitClause? -> ^(TOK_QUERY fromClause ^(TOK_INSERT ^(TOK_DESTINATION ^(TOK_DIR TOK_TMP_FILE))
                     selectClause whereClause? groupByClause? havingClause? orderByClause? clusterByClause?
                     distributeByClause? sortByClause? limitClause?))
   ;


body
   :
   insertClause
   selectClause
   whereClause?
   groupByClause?
   havingClause?
   orderByClause?
   clusterByClause?
   distributeByClause?
   sortByClause?
   limitClause? -> ^(TOK_INSERT insertClause?
                     selectClause whereClause? groupByClause? havingClause? orderByClause? clusterByClause?
                     distributeByClause? sortByClause? limitClause?)
   |
   selectClause
   whereClause?
   groupByClause?
   havingClause?
   orderByClause?
   clusterByClause?
   distributeByClause?
   sortByClause?
   limitClause? -> ^(TOK_INSERT ^(TOK_DESTINATION ^(TOK_DIR TOK_TMP_FILE))
                     selectClause whereClause? groupByClause? havingClause? orderByClause? clusterByClause?
                     distributeByClause? sortByClause? limitClause?)
   ;

insertClause
@init { msgs.push("insert clause"); }
@after { msgs.pop(); }
   :
   KW_INSERT KW_OVERWRITE destination -> ^(TOK_DESTINATION destination)
   ;

destination
@init { msgs.push("destination specification"); }
@after { msgs.pop(); }
   :
     KW_LOCAL KW_DIRECTORY StringLiteral -> ^(TOK_LOCAL_DIR StringLiteral)
   | KW_DIRECTORY StringLiteral -> ^(TOK_DIR StringLiteral)
   | KW_TABLE tableOrPartition -> ^(tableOrPartition)
   ;

limitClause
@init { msgs.push("limit clause"); }
@after { msgs.pop(); }
   :
   KW_LIMIT num=Number -> ^(TOK_LIMIT $num)
   ;

//----------------------- Rules for parsing selectClause -----------------------------
// select a,b,c ...
selectClause
@init { msgs.push("select clause"); }
@after { msgs.pop(); }
    :
    KW_SELECT hintClause? (((KW_ALL | dist=KW_DISTINCT)? selectList)
                          | (transform=KW_TRANSFORM selectTrfmClause))
     -> {$transform == null && $dist == null}? ^(TOK_SELECT hintClause? selectList)
     -> {$transform == null && $dist != null}? ^(TOK_SELECTDI hintClause? selectList)
     -> ^(TOK_SELECT hintClause? ^(TOK_SELEXPR selectTrfmClause) )
    |
    trfmClause  ->^(TOK_SELECT ^(TOK_SELEXPR trfmClause))
    ;

selectList
@init { msgs.push("select list"); }
@after { msgs.pop(); }
    :
    selectItem ( COMMA  selectItem )* -> selectItem+
    ;

selectTrfmClause
@init { msgs.push("transform clause"); }
@after { msgs.pop(); }
    :
    LPAREN selectExpressionList RPAREN
    inSerde=rowFormat inRec=recordWriter
    KW_USING StringLiteral
    ( KW_AS ((LPAREN (aliasList | columnNameTypeList) RPAREN) | (aliasList | columnNameTypeList)))?
    outSerde=rowFormat outRec=recordReader
    -> ^(TOK_TRANSFORM selectExpressionList $inSerde $inRec StringLiteral $outSerde $outRec aliasList? columnNameTypeList?)
    ;

hintClause
@init { msgs.push("hint clause"); }
@after { msgs.pop(); }
    :
    DIVIDE STAR PLUS hintList STAR DIVIDE -> ^(TOK_HINTLIST hintList)
    ;

hintList
@init { msgs.push("hint list"); }
@after { msgs.pop(); }
    :
    hintItem (COMMA hintItem)* -> hintItem+
    ;

hintItem
@init { msgs.push("hint item"); }
@after { msgs.pop(); }
    :
    hintName (LPAREN hintArgs RPAREN)? -> ^(TOK_HINT hintName hintArgs?)
    ;

hintName
@init { msgs.push("hint name"); }
@after { msgs.pop(); }
    :
    KW_MAPJOIN -> TOK_MAPJOIN
    | KW_STREAMTABLE -> TOK_STREAMTABLE
    | KW_HOLD_DDLTIME -> TOK_HOLD_DDLTIME
    ;

hintArgs
@init { msgs.push("hint arguments"); }
@after { msgs.pop(); }
    :
    hintArgName (COMMA hintArgName)* -> ^(TOK_HINTARGLIST hintArgName+)
    ;

hintArgName
@init { msgs.push("hint argument name"); }
@after { msgs.pop(); }
    :
    Identifier
    ;

selectItem
@init { msgs.push("selection target"); }
@after { msgs.pop(); }
    :
    ( selectExpression  ((KW_AS? Identifier) | (KW_AS LPAREN Identifier (COMMA Identifier)* RPAREN))?) -> ^(TOK_SELEXPR selectExpression Identifier*)
    ;

trfmClause
@init { msgs.push("transform clause"); }
@after { msgs.pop(); }
    :
    (   KW_MAP    selectExpressionList
      | KW_REDUCE selectExpressionList )
    inSerde=rowFormat inRec=recordWriter
    KW_USING StringLiteral
    ( KW_AS ((LPAREN (aliasList | columnNameTypeList) RPAREN) | (aliasList | columnNameTypeList)))?
    outSerde=rowFormat outRec=recordReader
    -> ^(TOK_TRANSFORM selectExpressionList $inSerde $inRec StringLiteral $outSerde $outRec aliasList? columnNameTypeList?)
    ;

selectExpression
@init { msgs.push("select expression"); }
@after { msgs.pop(); }
    :
    expression | tableAllColumns
    ;

selectExpressionList
@init { msgs.push("select expression list"); }
@after { msgs.pop(); }
    :
    selectExpression (COMMA selectExpression)* -> ^(TOK_EXPLIST selectExpression+)
    ;


//-----------------------------------------------------------------------------------

tableAllColumns
    : STAR
        -> ^(TOK_ALLCOLREF)
    | tableName DOT STAR
        -> ^(TOK_ALLCOLREF tableName)
    ;

// (table|column)
tableOrColumn
@init { msgs.push("table or column identifier"); }
@after { msgs.pop(); }
    :
    Identifier -> ^(TOK_TABLE_OR_COL Identifier)
    ;

expressionList
@init { msgs.push("expression list"); }
@after { msgs.pop(); }
    :
    expression (COMMA expression)* -> ^(TOK_EXPLIST expression+)
    ;

aliasList
@init { msgs.push("alias list"); }
@after { msgs.pop(); }
    :
    Identifier (COMMA Identifier)* -> ^(TOK_ALIASLIST Identifier+)
    ;

//----------------------- Rules for parsing fromClause ------------------------------
// from [col1, col2, col3] table1, [col4, col5] table2
fromClause
@init { msgs.push("from clause"); }
@after { msgs.pop(); }
    :
    KW_FROM joinSource -> ^(TOK_FROM joinSource)
    ;

joinSource
@init { msgs.push("join source"); }
@after { msgs.pop(); }
    : fromSource ( joinToken^ fromSource (KW_ON! expression)? )*
    | uniqueJoinToken^ uniqueJoinSource (COMMA! uniqueJoinSource)+
    ;

uniqueJoinSource
@init { msgs.push("join source"); }
@after { msgs.pop(); }
    : KW_PRESERVE? fromSource uniqueJoinExpr
    ;

uniqueJoinExpr
@init { msgs.push("unique join expression list"); }
@after { msgs.pop(); }
    : LPAREN e1+=expression (COMMA e1+=expression)* RPAREN
      -> ^(TOK_EXPLIST $e1*)
    ;

uniqueJoinToken
@init { msgs.push("unique join"); }
@after { msgs.pop(); }
    : KW_UNIQUEJOIN -> TOK_UNIQUEJOIN;

joinToken
@init { msgs.push("join type specifier"); }
@after { msgs.pop(); }
    :
      KW_JOIN                     -> TOK_JOIN
    | KW_LEFT  KW_OUTER KW_JOIN   -> TOK_LEFTOUTERJOIN
    | KW_RIGHT KW_OUTER KW_JOIN   -> TOK_RIGHTOUTERJOIN
    | KW_FULL  KW_OUTER KW_JOIN   -> TOK_FULLOUTERJOIN
    | KW_LEFT  KW_SEMI  KW_JOIN   -> TOK_LEFTSEMIJOIN
    ;

lateralView
@init {msgs.push("lateral view"); }
@after {msgs.pop(); }
	:
	KW_LATERAL KW_VIEW function tableAlias KW_AS Identifier (COMMA Identifier)* -> ^(TOK_LATERAL_VIEW ^(TOK_SELECT ^(TOK_SELEXPR function Identifier+ tableAlias)))
	;

tableAlias
@init {msgs.push("table alias"); }
@after {msgs.pop(); }
    :
    Identifier -> ^(TOK_TABALIAS Identifier)
    ;

fromSource
@init { msgs.push("from source"); }
@after { msgs.pop(); }
    :
    (tableSource | subQuerySource) (lateralView^)*
    ;

tableSample
@init { msgs.push("table sample specification"); }
@after { msgs.pop(); }
    :
    KW_TABLESAMPLE LPAREN KW_BUCKET (numerator=Number) KW_OUT KW_OF (denominator=Number) (KW_ON expr+=expression (COMMA expr+=expression)*)? RPAREN -> ^(TOK_TABLESAMPLE $numerator $denominator $expr*)
    ;

tableSource
@init { msgs.push("table source"); }
@after { msgs.pop(); }
    : tabname=tableName (ts=tableSample)? (alias=Identifier)?
    -> ^(TOK_TABREF $tabname $ts? $alias?)
    ;

tableName
@init { msgs.push("table name"); }
@after { msgs.pop(); }
    : (db=Identifier DOT)? tab=Identifier
    -> ^(TOK_TABNAME $db? $tab)
    ;

viewName
@init { msgs.push("view name"); }
@after { msgs.pop(); }
    :
    (db=Identifier DOT)? view=Identifier
    -> ^(TOK_TABNAME $db? $view)
    ;

subQuerySource
@init { msgs.push("subquery source"); }
@after { msgs.pop(); }
    :
    LPAREN queryStatementExpression RPAREN Identifier -> ^(TOK_SUBQUERY queryStatementExpression Identifier)
    ;

//----------------------- Rules for parsing whereClause -----------------------------
// where a=b and ...
whereClause
@init { msgs.push("where clause"); }
@after { msgs.pop(); }
    :
    KW_WHERE searchCondition -> ^(TOK_WHERE searchCondition)
    ;

searchCondition
@init { msgs.push("search condition"); }
@after { msgs.pop(); }
    :
    expression
    ;

//-----------------------------------------------------------------------------------

// group by a,b
groupByClause
@init { msgs.push("group by clause"); }
@after { msgs.pop(); }
    :
    KW_GROUP KW_BY
    groupByExpression
    ( COMMA groupByExpression )*
    -> ^(TOK_GROUPBY groupByExpression+)
    ;

groupByExpression
@init { msgs.push("group by expression"); }
@after { msgs.pop(); }
    :
    expression
    ;

havingClause
@init { msgs.push("having clause"); }
@after { msgs.pop(); }
    :
    KW_HAVING havingCondition -> ^(TOK_HAVING havingCondition)
    ;

havingCondition
@init { msgs.push("having condition"); }
@after { msgs.pop(); }
    :
    expression
    ;

// order by a,b
orderByClause
@init { msgs.push("order by clause"); }
@after { msgs.pop(); }
    :
    KW_ORDER KW_BY
    columnRefOrder
    ( COMMA columnRefOrder)* -> ^(TOK_ORDERBY columnRefOrder+)
    ;

clusterByClause
@init { msgs.push("cluster by clause"); }
@after { msgs.pop(); }
    :
    KW_CLUSTER KW_BY
    expression
    ( COMMA expression )* -> ^(TOK_CLUSTERBY expression+)
    ;

distributeByClause
@init { msgs.push("distribute by clause"); }
@after { msgs.pop(); }
    :
    KW_DISTRIBUTE KW_BY
    expression (COMMA expression)* -> ^(TOK_DISTRIBUTEBY expression+)
    ;

sortByClause
@init { msgs.push("sort by clause"); }
@after { msgs.pop(); }
    :
    KW_SORT KW_BY
    columnRefOrder
    ( COMMA columnRefOrder)* -> ^(TOK_SORTBY columnRefOrder+)
    ;

// fun(par1, par2, par3)
function
@init { msgs.push("function specification"); }
@after { msgs.pop(); }
    :
    functionName
    LPAREN
      (
        (star=STAR)
        | (dist=KW_DISTINCT)? (expression (COMMA expression)*)?
      )
    RPAREN -> {$star != null}? ^(TOK_FUNCTIONSTAR functionName)
           -> {$dist == null}? ^(TOK_FUNCTION functionName (expression+)?)
                            -> ^(TOK_FUNCTIONDI functionName (expression+)?)
    ;

functionName
@init { msgs.push("function name"); }
@after { msgs.pop(); }
    : // Keyword IF is also a function name
    Identifier | KW_IF | KW_ARRAY | KW_MAP | KW_STRUCT | KW_UNIONTYPE
    ;

castExpression
@init { msgs.push("cast expression"); }
@after { msgs.pop(); }
    :
    KW_CAST
    LPAREN
          expression
          KW_AS
          primitiveType
    RPAREN -> ^(TOK_FUNCTION primitiveType expression)
    ;

caseExpression
@init { msgs.push("case expression"); }
@after { msgs.pop(); }
    :
    KW_CASE expression
    (KW_WHEN expression KW_THEN expression)+
    (KW_ELSE expression)?
    KW_END -> ^(TOK_FUNCTION KW_CASE expression*)
    ;

whenExpression
@init { msgs.push("case expression"); }
@after { msgs.pop(); }
    :
    KW_CASE
     ( KW_WHEN expression KW_THEN expression)+
    (KW_ELSE expression)?
    KW_END -> ^(TOK_FUNCTION KW_WHEN expression*)
    ;

constant
@init { msgs.push("constant"); }
@after { msgs.pop(); }
    :
    Number
    | StringLiteral
    | charSetStringLiteral
    | booleanValue
    ;

charSetStringLiteral
@init { msgs.push("character string literal"); }
@after { msgs.pop(); }
    :
    csName=CharSetName csLiteral=CharSetLiteral -> ^(TOK_CHARSETLITERAL $csName $csLiteral)
    ;

expression
@init { msgs.push("expression specification"); }
@after { msgs.pop(); }
    :
    precedenceOrExpression
    ;

atomExpression
    :
    KW_NULL -> TOK_NULL
    | constant
    | function
    | castExpression
    | caseExpression
    | whenExpression
    | tableOrColumn
    | LPAREN! expression RPAREN!
    ;


precedenceFieldExpression
    :
    atomExpression ((LSQUARE^ expression RSQUARE!) | (DOT^ Identifier))*
    ;

precedenceUnaryOperator
    :
    PLUS | MINUS | TILDE
    ;

nullCondition
    :
    KW_NULL -> ^(TOK_ISNULL)
    | KW_NOT KW_NULL -> ^(TOK_ISNOTNULL)
    ;

precedenceUnaryPrefixExpression
    :
    (precedenceUnaryOperator^)* precedenceFieldExpression
    ;

precedenceUnarySuffixExpression
    : precedenceUnaryPrefixExpression (a=KW_IS nullCondition)?
    -> {$a != null}? ^(TOK_FUNCTION nullCondition precedenceUnaryPrefixExpression)
    -> precedenceUnaryPrefixExpression
    ;


precedenceBitwiseXorOperator
    :
    BITWISEXOR
    ;

precedenceBitwiseXorExpression
    :
    precedenceUnarySuffixExpression (precedenceBitwiseXorOperator^ precedenceUnarySuffixExpression)*
    ;


precedenceStarOperator
    :
    STAR | DIVIDE | MOD | DIV
    ;

precedenceStarExpression
    :
    precedenceBitwiseXorExpression (precedenceStarOperator^ precedenceBitwiseXorExpression)*
    ;


precedencePlusOperator
    :
    PLUS | MINUS
    ;

precedencePlusExpression
    :
    precedenceStarExpression (precedencePlusOperator^ precedenceStarExpression)*
    ;


precedenceAmpersandOperator
    :
    AMPERSAND
    ;

precedenceAmpersandExpression
    :
    precedencePlusExpression (precedenceAmpersandOperator^ precedencePlusExpression)*
    ;


precedenceBitwiseOrOperator
    :
    BITWISEOR
    ;

precedenceBitwiseOrExpression
    :
    precedenceAmpersandExpression (precedenceBitwiseOrOperator^ precedenceAmpersandExpression)*
    ;


precedenceEqualOperator
    :
    EQUAL | NOTEQUAL | LESSTHANOREQUALTO | LESSTHAN | GREATERTHANOREQUALTO | GREATERTHAN
    | KW_LIKE | KW_RLIKE | KW_REGEXP
    ;

precedenceEqualExpression
    :
    precedenceBitwiseOrExpression ( (precedenceEqualOperator^ precedenceBitwiseOrExpression) | (inOperator^ expressions) )*
    ;

inOperator
    :
    KW_IN -> ^(TOK_FUNCTION KW_IN)
    ;

expressions
    :
    LPAREN expression (COMMA expression)* RPAREN -> expression*
    ;

precedenceNotOperator
    :
    KW_NOT
    ;

precedenceNotExpression
    :
    (precedenceNotOperator^)* precedenceEqualExpression
    ;


precedenceAndOperator
    :
    KW_AND
    ;

precedenceAndExpression
    :
    precedenceNotExpression (precedenceAndOperator^ precedenceNotExpression)*
    ;


precedenceOrOperator
    :
    KW_OR
    ;

precedenceOrExpression
    :
    precedenceAndExpression (precedenceOrOperator^ precedenceAndExpression)*
    ;


booleanValue
    :
    KW_TRUE^ | KW_FALSE^
    ;

tableOrPartition
   :
   tableName partitionSpec? -> ^(TOK_TAB tableName partitionSpec?)
   ;

partitionSpec
    :
    KW_PARTITION
     LPAREN partitionVal (COMMA  partitionVal )* RPAREN -> ^(TOK_PARTSPEC partitionVal +)
    ;

partitionVal
    :
    Identifier (EQUAL constant)? -> ^(TOK_PARTVAL Identifier constant?)
    ;

sysFuncNames
    :
      KW_AND
    | KW_OR
    | KW_NOT
    | KW_LIKE
    | KW_IF
    | KW_CASE
    | KW_WHEN
    | KW_TINYINT
    | KW_SMALLINT
    | KW_INT
    | KW_BIGINT
    | KW_FLOAT
    | KW_DOUBLE
    | KW_BOOLEAN
    | KW_STRING
    | KW_ARRAY
    | KW_MAP
    | KW_STRUCT
    | KW_UNIONTYPE
    | EQUAL
    | NOTEQUAL
    | LESSTHANOREQUALTO
    | LESSTHAN
    | GREATERTHANOREQUALTO
    | GREATERTHAN
    | DIVIDE
    | PLUS
    | MINUS
    | STAR
    | MOD
    | DIV
    | AMPERSAND
    | TILDE
    | BITWISEOR
    | BITWISEXOR
    | KW_RLIKE
    | KW_REGEXP
    | KW_IN
    ;

descFuncNames
    :
      sysFuncNames
    | StringLiteral
    | Identifier
    ;

// Keywords

kwUser 
: 
{input.LT(1).getText().equalsIgnoreCase("user")}? Identifier;

kwRole 
: 
{input.LT(1).getText().equalsIgnoreCase("role")}? Identifier;

KW_TRUE : 'TRUE';
KW_FALSE : 'FALSE';
KW_ALL : 'ALL';
KW_AND : 'AND';
KW_OR : 'OR';
KW_NOT : 'NOT' | '!';
KW_LIKE : 'LIKE';

KW_IF : 'IF';
KW_EXISTS : 'EXISTS';

KW_ASC : 'ASC';
KW_DESC : 'DESC';
KW_ORDER : 'ORDER';
KW_GROUP : 'GROUP';
KW_BY : 'BY';
KW_HAVING : 'HAVING';
KW_WHERE : 'WHERE';
KW_FROM : 'FROM';
KW_AS : 'AS';
KW_SELECT : 'SELECT';
KW_DISTINCT : 'DISTINCT';
KW_INSERT : 'INSERT';
KW_OVERWRITE : 'OVERWRITE';
KW_OUTER : 'OUTER';
KW_UNIQUEJOIN : 'UNIQUEJOIN';
KW_PRESERVE : 'PRESERVE';
KW_JOIN : 'JOIN';
KW_LEFT : 'LEFT';
KW_RIGHT : 'RIGHT';
KW_FULL : 'FULL';
KW_ON : 'ON';
KW_PARTITION : 'PARTITION';
KW_PARTITIONS : 'PARTITIONS';
KW_TABLE: 'TABLE';
KW_TABLES: 'TABLES';
KW_INDEX: 'INDEX';
KW_INDEXES: 'INDEXES';
KW_REBUILD: 'REBUILD';
KW_FUNCTIONS: 'FUNCTIONS';
KW_SHOW: 'SHOW';
KW_MSCK: 'MSCK';
KW_REPAIR: 'REPAIR';
KW_DIRECTORY: 'DIRECTORY';
KW_LOCAL: 'LOCAL';
KW_TRANSFORM : 'TRANSFORM';
KW_USING: 'USING';
KW_CLUSTER: 'CLUSTER';
KW_DISTRIBUTE: 'DISTRIBUTE';
KW_SORT: 'SORT';
KW_UNION: 'UNION';
KW_LOAD: 'LOAD';
KW_DATA: 'DATA';
KW_INPATH: 'INPATH';
KW_IS: 'IS';
KW_NULL: 'NULL';
KW_CREATE: 'CREATE';
KW_EXTERNAL: 'EXTERNAL';
KW_ALTER: 'ALTER';
KW_CHANGE: 'CHANGE';
KW_COLUMN: 'COLUMN';
KW_FIRST: 'FIRST';
KW_AFTER: 'AFTER';
KW_DESCRIBE: 'DESCRIBE';
KW_DROP: 'DROP';
KW_RENAME: 'RENAME';
KW_TO: 'TO';
KW_COMMENT: 'COMMENT';
KW_BOOLEAN: 'BOOLEAN';
KW_TINYINT: 'TINYINT';
KW_SMALLINT: 'SMALLINT';
KW_INT: 'INT';
KW_BIGINT: 'BIGINT';
KW_FLOAT: 'FLOAT';
KW_DOUBLE: 'DOUBLE';
KW_DATE: 'DATE';
KW_DATETIME: 'DATETIME';
KW_TIMESTAMP: 'TIMESTAMP';
KW_STRING: 'STRING';
KW_ARRAY: 'ARRAY';
KW_STRUCT: 'STRUCT';
KW_MAP: 'MAP';
KW_UNIONTYPE: 'UNIONTYPE';
KW_REDUCE: 'REDUCE';
KW_PARTITIONED: 'PARTITIONED';
KW_CLUSTERED: 'CLUSTERED';
KW_SORTED: 'SORTED';
KW_INTO: 'INTO';
KW_BUCKETS: 'BUCKETS';
KW_ROW: 'ROW';
KW_FORMAT: 'FORMAT';
KW_DELIMITED: 'DELIMITED';
KW_FIELDS: 'FIELDS';
KW_TERMINATED: 'TERMINATED';
KW_ESCAPED: 'ESCAPED';
KW_COLLECTION: 'COLLECTION';
KW_ITEMS: 'ITEMS';
KW_KEYS: 'KEYS';
KW_KEY_TYPE: '$KEY$';
KW_LINES: 'LINES';
KW_STORED: 'STORED';
KW_FILEFORMAT: 'FILEFORMAT';
KW_SEQUENCEFILE: 'SEQUENCEFILE';
KW_TEXTFILE: 'TEXTFILE';
KW_RCFILE: 'RCFILE';
KW_INPUTFORMAT: 'INPUTFORMAT';
KW_OUTPUTFORMAT: 'OUTPUTFORMAT';
KW_INPUTDRIVER: 'INPUTDRIVER';
KW_OUTPUTDRIVER: 'OUTPUTDRIVER';
KW_OFFLINE: 'OFFLINE';
KW_ENABLE: 'ENABLE';
KW_DISABLE: 'DISABLE';
KW_READONLY: 'READONLY';
KW_NO_DROP: 'NO_DROP';
KW_LOCATION: 'LOCATION';
KW_TABLESAMPLE: 'TABLESAMPLE';
KW_BUCKET: 'BUCKET';
KW_OUT: 'OUT';
KW_OF: 'OF';
KW_CAST: 'CAST';
KW_ADD: 'ADD';
KW_REPLACE: 'REPLACE';
KW_COLUMNS: 'COLUMNS';
KW_RLIKE: 'RLIKE';
KW_REGEXP: 'REGEXP';
KW_TEMPORARY: 'TEMPORARY';
KW_FUNCTION: 'FUNCTION';
KW_EXPLAIN: 'EXPLAIN';
KW_EXTENDED: 'EXTENDED';
KW_FORMATTED: 'FORMATTED';
KW_SERDE: 'SERDE';
KW_WITH: 'WITH';
KW_DEFERRED: 'DEFERRED';
KW_SERDEPROPERTIES: 'SERDEPROPERTIES';
KW_DBPROPERTIES: 'DBPROPERTIES';
KW_LIMIT: 'LIMIT';
KW_SET: 'SET';
KW_TBLPROPERTIES: 'TBLPROPERTIES';
KW_IDXPROPERTIES: 'IDXPROPERTIES';
KW_VALUE_TYPE: '$VALUE$';
KW_ELEM_TYPE: '$ELEM$';
KW_CASE: 'CASE';
KW_WHEN: 'WHEN';
KW_THEN: 'THEN';
KW_ELSE: 'ELSE';
KW_END: 'END';
KW_MAPJOIN: 'MAPJOIN';
KW_STREAMTABLE: 'STREAMTABLE';
KW_HOLD_DDLTIME: 'HOLD_DDLTIME';
KW_CLUSTERSTATUS: 'CLUSTERSTATUS';
KW_UTC: 'UTC';
KW_UTCTIMESTAMP: 'UTC_TMESTAMP';
KW_LONG: 'LONG';
KW_DELETE: 'DELETE';
KW_PLUS: 'PLUS';
KW_MINUS: 'MINUS';
KW_FETCH: 'FETCH';
KW_INTERSECT: 'INTERSECT';
KW_VIEW: 'VIEW';
KW_IN: 'IN';
KW_DATABASE: 'DATABASE';
KW_DATABASES: 'DATABASES';
KW_MATERIALIZED: 'MATERIALIZED';
KW_SCHEMA: 'SCHEMA';
KW_SCHEMAS: 'SCHEMAS';
KW_GRANT: 'GRANT';
KW_REVOKE: 'REVOKE';
KW_SSL: 'SSL';
KW_UNDO: 'UNDO';
KW_LOCK: 'LOCK';
KW_LOCKS: 'LOCKS';
KW_UNLOCK: 'UNLOCK';
KW_SHARED: 'SHARED';
KW_EXCLUSIVE: 'EXCLUSIVE';
KW_PROCEDURE: 'PROCEDURE';
KW_UNSIGNED: 'UNSIGNED';
KW_WHILE: 'WHILE';
KW_READ: 'READ';
KW_READS: 'READS';
KW_PURGE: 'PURGE';
KW_RANGE: 'RANGE';
KW_ANALYZE: 'ANALYZE';
KW_BEFORE: 'BEFORE';
KW_BETWEEN: 'BETWEEN';
KW_BOTH: 'BOTH';
KW_BINARY: 'BINARY';
KW_CROSS: 'CROSS';
KW_CONTINUE: 'CONTINUE';
KW_CURSOR: 'CURSOR';
KW_TRIGGER: 'TRIGGER';
KW_RECORDREADER: 'RECORDREADER';
KW_RECORDWRITER: 'RECORDWRITER';
KW_SEMI: 'SEMI';
KW_LATERAL: 'LATERAL';
KW_TOUCH: 'TOUCH';
KW_ARCHIVE: 'ARCHIVE';
KW_UNARCHIVE: 'UNARCHIVE';
KW_COMPUTE: 'COMPUTE';
KW_STATISTICS: 'STATISTICS';
KW_USE: 'USE';
KW_OPTION: 'OPTION';
KW_SHOW_DATABASE: 'SHOW_DATABASE';
KW_UPDATE: 'UPDATE';


// Operators
// NOTE: if you add a new function/operator, add it to sysFuncNames so that describe function _FUNC_ will work.

DOT : '.'; // generated as a part of Number rule
COLON : ':' ;
COMMA : ',' ;
SEMICOLON : ';' ;

LPAREN : '(' ;
RPAREN : ')' ;
LSQUARE : '[' ;
RSQUARE : ']' ;
LCURLY : '{';
RCURLY : '}';

EQUAL : '=' | '==';
NOTEQUAL : '<>' | '!=';
LESSTHANOREQUALTO : '<=';
LESSTHAN : '<';
GREATERTHANOREQUALTO : '>=';
GREATERTHAN : '>';

DIVIDE : '/';
PLUS : '+';
MINUS : '-';
STAR : '*';
MOD : '%';
DIV : 'DIV';

AMPERSAND : '&';
TILDE : '~';
BITWISEOR : '|';
BITWISEXOR : '^';
QUESTION : '?';
DOLLAR : '$';

// LITERALS
fragment
Letter
    : 'a'..'z' | 'A'..'Z'
    ;

fragment
HexDigit
    : 'a'..'f' | 'A'..'F'
    ;

fragment
Digit
    :
    '0'..'9'
    ;

fragment
Exponent
    :
    'e' ( PLUS|MINUS )? (Digit)+
    ;

fragment
RegexComponent
    : 'a'..'z' | 'A'..'Z' | '0'..'9' | '_'
    | PLUS | STAR | QUESTION | MINUS | DOT
    | LPAREN | RPAREN | LSQUARE | RSQUARE | LCURLY | RCURLY
    | BITWISEXOR | BITWISEOR | DOLLAR
    ;

StringLiteral
    :
    ( '\'' ( ~('\''|'\\') | ('\\' .) )* '\''
    | '\"' ( ~('\"'|'\\') | ('\\' .) )* '\"'
    )+
    ;

CharSetLiteral
    :
    StringLiteral
    | '0' 'X' (HexDigit|Digit)+
    ;

Number
    :
    (Digit)+ ( DOT (Digit)* (Exponent)? | Exponent)?
    ;

Identifier
    :
    (Letter | Digit) (Letter | Digit | '_')*
    | '`' RegexComponent+ '`'
    ;

CharSetName
    :
    '_' (Letter | Digit | '_' | '-' | '.' | ':' )+
    ;

WS  :  (' '|'\r'|'\t'|'\n') {$channel=HIDDEN;}
    ;

COMMENT
  : '--' (~('\n'|'\r'))*
    { $channel=HIDDEN; }
  ;