PREHOOK: query: EXPLAIN SELECT
  sum('a'),
  avg('a'),
  variance('a'),
  std('a')
FROM src
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN SELECT
  sum('a'),
  avg('a'),
  variance('a'),
  std('a')
FROM src
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_TABREF src)) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION sum 'a')) (TOK_SELEXPR (TOK_FUNCTION avg 'a')) (TOK_SELEXPR (TOK_FUNCTION variance 'a')) (TOK_SELEXPR (TOK_FUNCTION std 'a')))))

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
              Group By Operator
                aggregations:
                      expr: sum('a')
                      expr: avg('a')
                      expr: variance('a')
                      expr: std('a')
                bucketGroup: false
                mode: hash
                outputColumnNames: _col0, _col1, _col2, _col3
                Reduce Output Operator
                  sort order: 
                  tag: -1
                  value expressions:
                        expr: _col0
                        type: double
                        expr: _col1
                        type: struct<count:bigint,sum:double>
                        expr: _col2
                        type: struct<count:bigint,sum:double,variance:double>
                        expr: _col3
                        type: struct<count:bigint,sum:double,variance:double>
      Reduce Operator Tree:
        Group By Operator
          aggregations:
                expr: sum(VALUE._col0)
                expr: avg(VALUE._col1)
                expr: variance(VALUE._col2)
                expr: std(VALUE._col3)
          bucketGroup: false
          mode: mergepartial
          outputColumnNames: _col0, _col1, _col2, _col3
          Select Operator
            expressions:
                  expr: _col0
                  type: double
                  expr: _col1
                  type: double
                  expr: _col2
                  type: double
                  expr: _col3
                  type: double
            outputColumnNames: _col0, _col1, _col2, _col3
            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: -1


PREHOOK: query: SELECT
  sum('a'),
  avg('a'),
  variance('a'),
  std('a')
FROM src
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/data/users/heyongqiang/hive-trunk-commit/build/ql/tmp/735631475/10000
POSTHOOK: query: SELECT
  sum('a'),
  avg('a'),
  variance('a'),
  std('a')
FROM src
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/data/users/heyongqiang/hive-trunk-commit/build/ql/tmp/735631475/10000
0.0	NULL	NULL	NULL