/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFStruct.java
Java | 73 lines | 47 code | 9 blank | 17 comment | 4 complexity | c098e627612c73765c8a6d85e69d660f MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- /**
- * 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.
- */
- package org.apache.hadoop.hive.ql.udf.generic;
- import java.util.ArrayList;
- import java.util.Arrays;
- import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
- import org.apache.hadoop.hive.ql.exec.Description;
- import org.apache.hadoop.hive.ql.metadata.HiveException;
- import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
- import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
- import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
- @Description(name = "struct",
- value = "_FUNC_(col1, col2, col3, ...) - Creates a struct with the given field values")
- public class GenericUDFStruct extends GenericUDF {
- Object[] ret;
- @Override
- public ObjectInspector initialize(ObjectInspector[] arguments)
- throws UDFArgumentException {
-
- int numFields = arguments.length;
- ret = new Object[numFields];
-
- ArrayList<String> fname = new ArrayList<String>(numFields);
- for (int f = 1; f <= numFields; f++) {
- fname.add("col" + f);
- }
- StructObjectInspector soi =
- ObjectInspectorFactory.getStandardStructObjectInspector(fname, Arrays.asList(arguments));
- return soi;
- }
- @Override
- public Object evaluate(DeferredObject[] arguments) throws HiveException {
- for (int i = 0; i < arguments.length; i++) {
- ret[i] = arguments[i].get();
- }
- return ret;
- }
- @Override
- public String getDisplayString(String[] children) {
- StringBuilder sb = new StringBuilder();
- sb.append("struct(");
- for (int i = 0; i < children.length; i++) {
- if (i > 0) {
- sb.append(',');
- }
- sb.append(children[i]);
- }
- sb.append(')');
- return sb.toString();
- }
- }