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
STAGE DEPENDENCIES:
  Stage-1 is a root stage
  Stage-0 depends on stages: Stage-1

STAGE PLANS:
  Stage: Stage-1
    Map Reduce
      Map Operator Tree:
          TableScan
            alias: src
            Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: COMPLETE
            Select Operator
              Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: COMPLETE
              Group By Operator
                aggregations: sum('a'), avg('a'), variance('a'), std('a')
                mode: hash
                outputColumnNames: _col0, _col1, _col2, _col3
                Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
                Reduce Output Operator
                  sort order: 
                  Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
                  value expressions: _col0 (type: double), _col1 (type: struct<count:bigint,sum:double,input:string>), _col2 (type: struct<count:bigint,sum:double,variance:double>), _col3 (type: struct<count:bigint,sum:double,variance:double>)
      Reduce Operator Tree:
        Group By Operator
          aggregations: sum(VALUE._col0), avg(VALUE._col1), variance(VALUE._col2), std(VALUE._col3)
          mode: mergepartial
          outputColumnNames: _col0, _col1, _col2, _col3
          Statistics: Num rows: 1 Data size: 32 Basic stats: COMPLETE Column stats: COMPLETE
          File Output Operator
            compressed: false
            Statistics: Num rows: 1 Data size: 32 Basic stats: COMPLETE Column stats: COMPLETE
            table:
                input format: org.apache.hadoop.mapred.TextInputFormat
                output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe

  Stage: Stage-0
    Fetch Operator
      limit: -1
      Processor Tree:
        ListSink

PREHOOK: query: SELECT
  sum('a'),
  avg('a'),
  variance('a'),
  std('a')
FROM src
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT
  sum('a'),
  avg('a'),
  variance('a'),
  std('a')
FROM src
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
0.0	NULL	NULL	NULL