PREHOOK: query: DESCRIBE FUNCTION case
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION case
POSTHOOK: type: DESCFUNCTION
CASE a WHEN b THEN c [WHEN d THEN e]* [ELSE f] END - When a = b, returns c; when a = d, return e; else return f
PREHOOK: query: DESCRIBE FUNCTION EXTENDED case
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED case
POSTHOOK: type: DESCFUNCTION
CASE a WHEN b THEN c [WHEN d THEN e]* [ELSE f] END - When a = b, returns c; when a = d, return e; else return f
Example:
 SELECT
 CASE deptno
   WHEN 1 THEN Engineering
   WHEN 2 THEN Finance
   ELSE admin
 END,
 CASE zone
   WHEN 7 THEN Americas
   ELSE Asia-Pac
 END
 FROM emp_details
PREHOOK: query: EXPLAIN
SELECT CASE 1
        WHEN 1 THEN 2
        WHEN 3 THEN 4
        ELSE 5
       END,
       CASE 2
        WHEN 1 THEN 2
        ELSE 5
       END,
       CASE 14
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 16
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 17
        WHEN 18 THEN NULL
        WHEN 17 THEN 20
       END,
       CASE 21
        WHEN 22 THEN 23
        WHEN 21 THEN 24
       END
FROM src tablesample (1 rows)
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN
SELECT CASE 1
        WHEN 1 THEN 2
        WHEN 3 THEN 4
        ELSE 5
       END,
       CASE 2
        WHEN 1 THEN 2
        ELSE 5
       END,
       CASE 14
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 16
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 17
        WHEN 18 THEN NULL
        WHEN 17 THEN 20
       END,
       CASE 21
        WHEN 22 THEN 23
        WHEN 21 THEN 24
       END
FROM src tablesample (1 rows)
POSTHOOK: type: QUERY
STAGE DEPENDENCIES:
  Stage-0 is a root stage

STAGE PLANS:
  Stage: Stage-0
    Fetch Operator
      limit: -1
      Processor Tree:
        TableScan
          alias: src
          Row Limit Per Split: 1
          Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: COMPLETE
          Select Operator
            expressions: 2 (type: int), 5 (type: int), 15 (type: int), null (type: void), CASE (17) WHEN (18) THEN (null) WHEN (17) THEN (20) END (type: int), 24 (type: int)
            outputColumnNames: _col0, _col1, _col2, _col3, _col4, _col5
            Statistics: Num rows: 500 Data size: 10000 Basic stats: COMPLETE Column stats: COMPLETE
            ListSink

PREHOOK: query: SELECT CASE 1
        WHEN 1 THEN 2
        WHEN 3 THEN 4
        ELSE 5
       END,
       CASE 2
        WHEN 1 THEN 2
        ELSE 5
       END,
       CASE 14
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 16
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 17
        WHEN 18 THEN NULL
        WHEN 17 THEN 20
       END,
       CASE 21
        WHEN 22 THEN 23
        WHEN 21 THEN 24
       END
FROM src tablesample (1 rows)
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT CASE 1
        WHEN 1 THEN 2
        WHEN 3 THEN 4
        ELSE 5
       END,
       CASE 2
        WHEN 1 THEN 2
        ELSE 5
       END,
       CASE 14
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 16
        WHEN 12 THEN 13
        WHEN 14 THEN 15
       END,
       CASE 17
        WHEN 18 THEN NULL
        WHEN 17 THEN 20
       END,
       CASE 21
        WHEN 22 THEN 23
        WHEN 21 THEN 24
       END
FROM src tablesample (1 rows)
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
2	5	15	NULL	20	24
PREHOOK: query: -- verify that short-circuiting is working correctly for CASE
-- we should never get to the ELSE branch, which would raise an exception
SELECT CASE 1 WHEN 1 THEN 'yo'
ELSE reflect('java.lang.String', 'bogus', 1) END
FROM src tablesample (1 rows)
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: -- verify that short-circuiting is working correctly for CASE
-- we should never get to the ELSE branch, which would raise an exception
SELECT CASE 1 WHEN 1 THEN 'yo'
ELSE reflect('java.lang.String', 'bogus', 1) END
FROM src tablesample (1 rows)
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
yo
PREHOOK: query: -- Allow compatible types in when/return type
SELECT CASE 1
        WHEN 1 THEN 123.0BD
        ELSE 0.0BD
       END,
       CASE 1
        WHEN 1.0 THEN 123
        WHEN 2 THEN 1.0
        ELSE 222.02BD
       END,
       CASE 'abc'
        WHEN cast('abc' as varchar(3)) THEN 'abcd'
        WHEN 'efg' THEN cast('efgh' as varchar(10))
        ELSE cast('ijkl' as char(4))
       END
FROM src tablesample (1 rows)
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: -- Allow compatible types in when/return type
SELECT CASE 1
        WHEN 1 THEN 123.0BD
        ELSE 0.0BD
       END,
       CASE 1
        WHEN 1.0 THEN 123
        WHEN 2 THEN 1.0
        ELSE 222.02BD
       END,
       CASE 'abc'
        WHEN cast('abc' as varchar(3)) THEN 'abcd'
        WHEN 'efg' THEN cast('efgh' as varchar(10))
        ELSE cast('ijkl' as char(4))
       END
FROM src tablesample (1 rows)
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
123	123.0	abcd