PREHOOK: query: EXPLAIN
SELECT src.key, sum(substr(src.value,5)) FROM src GROUP BY src.key LIMIT 5
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN
SELECT src.key, sum(substr(src.value,5)) FROM src GROUP BY src.key LIMIT 5
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_TABLE_OR_COL src) key)) (TOK_SELEXPR (TOK_FUNCTION sum (TOK_FUNCTION substr (. (TOK_TABLE_OR_COL src) value) 5)))) (TOK_GROUPBY (. (TOK_TABLE_OR_COL src) key)) (TOK_LIMIT 5)))

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: key
                    type: string
                    expr: value
                    type: string
              outputColumnNames: key, value
              Group By Operator
                aggregations:
                      expr: sum(substr(value, 5))
                bucketGroup: false
                keys:
                      expr: key
                      type: string
                mode: hash
                outputColumnNames: _col0, _col1
                Reduce Output Operator
                  key expressions:
                        expr: _col0
                        type: string
                  sort order: +
                  Map-reduce partition columns:
                        expr: _col0
                        type: string
                  tag: -1
                  value expressions:
                        expr: _col1
                        type: double
      Reduce Operator Tree:
        Group By Operator
          aggregations:
                expr: sum(VALUE._col0)
          bucketGroup: false
          keys:
                expr: KEY._col0
                type: string
          mode: mergepartial
          outputColumnNames: _col0, _col1
          Select Operator
            expressions:
                  expr: _col0
                  type: string
                  expr: _col1
                  type: double
            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: 5


PREHOOK: query: SELECT src.key, sum(substr(src.value,5)) FROM src GROUP BY src.key LIMIT 5
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/data/users/heyongqiang/hive-trunk-commit/build/ql/tmp/184969854/10000
POSTHOOK: query: SELECT src.key, sum(substr(src.value,5)) FROM src GROUP BY src.key LIMIT 5
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/data/users/heyongqiang/hive-trunk-commit/build/ql/tmp/184969854/10000
0	0.0
10	10.0
100	200.0
103	206.0
104	208.0