insert selectした場合のexplain実行結果

gistfile1.txt

ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME hoge))) (TOK_INSERT (TOK_DESTINATION (TOK_TAB (TOK_TABNAME piyo))) (TOK_SELECT (TOK_SELEXPR TOK_ALLCOLREF))))

STAGE DEPENDENCIES:
  Stage-1 is a root stage
  Stage-5 depends on stages: Stage-1 , consists of Stage-4, Stage-3
  Stage-4
  Stage-0 depends on stages: Stage-4, Stage-3
  Stage-2 depends on stages: Stage-0
  Stage-3

STAGE PLANS:
  Stage: Stage-1
    Map Reduce
      Alias -> Map Operator Tree:
        hoge 
          TableScan
            alias: hoge
            Select Operator
              expressions:
                    expr: aaa
                    type: string
              outputColumnNames: _col0
              File Output Operator
                compressed: false
                GlobalTableId: 1
                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
                    name: default.piyo

  Stage: Stage-5
    Conditional Operator

  Stage: Stage-4
    Move Operator
      files:
          hdfs directory: true
          destination: file:/tmp/hive-wyukawa/hive_2012-05-20_15-42-48_828_2277773137428089858/-ext-10000

  Stage: Stage-0
    Move Operator
      tables:
          replace: true
          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
              name: default.piyo

  Stage: Stage-2
    Stats-Aggr Operator

  Stage: Stage-3
    Map Reduce
      Alias -> Map Operator Tree:
        file:/tmp/hive-wyukawa/hive_2012-05-20_15-42-48_828_2277773137428089858/-ext-10002 
            File Output Operator
              compressed: false
              GlobalTableId: 0
              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
                  name: default.piyo