PREHOOK: query: DESCRIBE FUNCTION create_union
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION create_union
POSTHOOK: type: DESCFUNCTION
create_union(tag, obj1, obj2, obj3, ...) - Creates a union with the object for given tag
PREHOOK: query: DESCRIBE FUNCTION EXTENDED create_union
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED create_union
POSTHOOK: type: DESCFUNCTION
create_union(tag, obj1, obj2, obj3, ...) - Creates a union with the object for given tag
Example:
  > SELECT create_union(1, 1, "one") FROM src LIMIT 1;
  one
PREHOOK: query: EXPLAIN
SELECT create_union(0, key), create_union(if(key<100, 0, 1), 2.0, value),
create_union(1, "a", struct(2, "b"))
FROM src LIMIT 2
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN
SELECT create_union(0, key), create_union(if(key<100, 0, 1), 2.0, value),
create_union(1, "a", struct(2, "b"))
FROM src LIMIT 2
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME src))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION create_union 0 (TOK_TABLE_OR_COL key))) (TOK_SELEXPR (TOK_FUNCTION create_union (TOK_FUNCTION if (< (TOK_TABLE_OR_COL key) 100) 0 1) 2.0 (TOK_TABLE_OR_COL value))) (TOK_SELEXPR (TOK_FUNCTION create_union 1 "a" (TOK_FUNCTION struct 2 "b")))) (TOK_LIMIT 2)))

STAGE DEPENDENCIES:
  Stage-1 is a root stage
  Stage-0 is a root stage

STAGE PLANS:
  Stage: Stage-1
    Map Reduce
      Alias -> Map Operator Tree:
        src 
          TableScan
            alias: src
            Select Operator
              expressions:
                    expr: create_union(0,key)
                    type: uniontype<string>
                    expr: create_union(if((key < 100), 0, 1),2.0,value)
                    type: uniontype<double,string>
                    expr: create_union(1,'a',struct(2,'b'))
                    type: uniontype<string,struct<col1:int,col2:string>>
              outputColumnNames: _col0, _col1, _col2
              Limit
                File Output Operator
                  compressed: false
                  GlobalTableId: 0
                  table:
                      input format: org.apache.hadoop.mapred.TextInputFormat
                      output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat

  Stage: Stage-0
    Fetch Operator
      limit: 2


PREHOOK: query: SELECT create_union(0, key), create_union(if(key<100, 0, 1), 2.0, value),
create_union(1, "a", struct(2, "b"))
FROM src LIMIT 2
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-43-01_598_5119870403669486647/-mr-10000
POSTHOOK: query: SELECT create_union(0, key), create_union(if(key<100, 0, 1), 2.0, value),
create_union(1, "a", struct(2, "b"))
FROM src LIMIT 2
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-43-01_598_5119870403669486647/-mr-10000
{0:"238"}	{1:"val_238"}	{1:{"col1":2,"col2":"b"}}
{0:"86"}	{0:2.0}	{1:{"col1":2,"col2":"b"}}