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/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFAsin.java

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Java | 53 lines | 23 code | 6 blank | 24 comment | 3 complexity | 6db2e3b9aa1a5918aef966340c885929 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
  1. /**
  2. * Licensed to the Apache Software Foundation (ASF) under one
  3. * or more contributor license agreements. See the NOTICE file
  4. * distributed with this work for additional information
  5. * regarding copyright ownership. The ASF licenses this file
  6. * to you under the Apache License, Version 2.0 (the
  7. * "License"); you may not use this file except in compliance
  8. * with the License. You may obtain a copy of the License at
  9. *
  10. * http://www.apache.org/licenses/LICENSE-2.0
  11. *
  12. * Unless required by applicable law or agreed to in writing, software
  13. * distributed under the License is distributed on an "AS IS" BASIS,
  14. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15. * See the License for the specific language governing permissions and
  16. * limitations under the License.
  17. */
  18. package org.apache.hadoop.hive.ql.udf;
  19. import org.apache.hadoop.hive.ql.exec.Description;
  20. import org.apache.hadoop.hive.ql.exec.UDF;
  21. import org.apache.hadoop.hive.serde2.io.DoubleWritable;
  22. /**
  23. * UDFAsin.
  24. *
  25. */
  26. @Description(name = "asin",
  27. value = "_FUNC_(x) - returns the arc sine of x if -1<=x<=1 or NULL otherwise",
  28. extended = "Example:\n"
  29. + " > SELECT _FUNC_(0) FROM src LIMIT 1;\n"
  30. + " 0\n"
  31. + " > SELECT _FUNC_(2) FROM src LIMIT 1;\n" + " NULL")
  32. public class UDFAsin extends UDF {
  33. private DoubleWritable result = new DoubleWritable();
  34. public UDFAsin() {
  35. }
  36. /**
  37. * Take Arc Sine of a in radians.
  38. */
  39. public DoubleWritable evaluate(DoubleWritable a) {
  40. if (a == null) {
  41. return null;
  42. } else {
  43. result.set(Math.asin(a.get()));
  44. return result;
  45. }
  46. }
  47. }