PREHOOK: query: DESCRIBE FUNCTION stack
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION stack
POSTHOOK: type: DESCFUNCTION
stack(n, cols...) - turns k columns into n rows of size k/n each
PREHOOK: query: EXPLAIN SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z') a AS x, y LIMIT 2
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z') a AS x, y LIMIT 2
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_LATERAL_VIEW (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION STACK 2 'x' (TOK_FUNCTION array 1) 'z') x y (TOK_TABALIAS a))) (TOK_TABREF (TOK_TABNAME src)))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_TABLE_OR_COL x)) (TOK_SELEXPR (TOK_TABLE_OR_COL y))) (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
            Lateral View Forward
              Select Operator
                Lateral View Join Operator
                  outputColumnNames: _col2, _col3
                  Select Operator
                    expressions:
                          expr: _col2
                          type: string
                          expr: _col3
                          type: array<int>
                    outputColumnNames: _col0, _col1
                    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
              Select Operator
                expressions:
                      expr: 2
                      type: int
                      expr: 'x'
                      type: string
                      expr: array(1)
                      type: array<int>
                      expr: 'z'
                      type: string
                outputColumnNames: _col0, _col1, _col2, _col3
                UDTF Operator
                  function name: stack
                  Lateral View Join Operator
                    outputColumnNames: _col2, _col3
                    Select Operator
                      expressions:
                            expr: _col2
                            type: string
                            expr: _col3
                            type: array<int>
                      outputColumnNames: _col0, _col1
                      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: EXPLAIN SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z', array(4)) a AS x, y LIMIT 2
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z', array(4)) a AS x, y LIMIT 2
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_LATERAL_VIEW (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION STACK 2 'x' (TOK_FUNCTION array 1) 'z' (TOK_FUNCTION array 4)) x y (TOK_TABALIAS a))) (TOK_TABREF (TOK_TABNAME src)))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_TABLE_OR_COL x)) (TOK_SELEXPR (TOK_TABLE_OR_COL y))) (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
            Lateral View Forward
              Select Operator
                Lateral View Join Operator
                  outputColumnNames: _col2, _col3
                  Select Operator
                    expressions:
                          expr: _col2
                          type: string
                          expr: _col3
                          type: array<int>
                    outputColumnNames: _col0, _col1
                    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
              Select Operator
                expressions:
                      expr: 2
                      type: int
                      expr: 'x'
                      type: string
                      expr: array(1)
                      type: array<int>
                      expr: 'z'
                      type: string
                      expr: array(4)
                      type: array<int>
                outputColumnNames: _col0, _col1, _col2, _col3, _col4
                UDTF Operator
                  function name: stack
                  Lateral View Join Operator
                    outputColumnNames: _col2, _col3
                    Select Operator
                      expressions:
                            expr: _col2
                            type: string
                            expr: _col3
                            type: array<int>
                      outputColumnNames: _col0, _col1
                      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 x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z') a AS x, y LIMIT 2
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z') a AS x, y LIMIT 2
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
x	[1]
z	null
PREHOOK: query: SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z', array(4)) a AS x, y LIMIT 2
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT x, y FROM src LATERAL VIEW STACK(2, 'x', array(1), 'z', array(4)) a AS x, y LIMIT 2
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
x	[1]
z	[4]