Support CASE and IF statement
-----------------------------
Key: HIVE-164
URL: https://issues.apache.org/jira/browse/HIVE-164
Project: Hadoop Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Zheng Shao
See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html for
details.
Syntax:
{code}
CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result
...] [<ELSE result] END
CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...] [ELSE
result] END
IF(expr1,expr2,expr3)
{code}
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