PREHOOK: query: explain 
select sign(0) FROM src LIMIT 1
PREHOOK: type: QUERY
POSTHOOK: query: explain 
select sign(0) FROM src LIMIT 1
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME src))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION sign 0))) (TOK_LIMIT 1)))

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: sign(0)
                    type: double
              outputColumnNames: _col0
              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: 1


PREHOOK: query: select sign(0) FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-17_227_1383191053945370419/-mr-10000
POSTHOOK: query: select sign(0) FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-17_227_1383191053945370419/-mr-10000
0.0
PREHOOK: query: select sign(-45) FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-20_497_4344647994964610941/-mr-10000
POSTHOOK: query: select sign(-45) FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-20_497_4344647994964610941/-mr-10000
-1.0
PREHOOK: query: select sign(46)  FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-23_774_6548968224814030868/-mr-10000
POSTHOOK: query: select sign(46)  FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-23_774_6548968224814030868/-mr-10000
1.0
PREHOOK: query: DESCRIBE FUNCTION sign
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION sign
POSTHOOK: type: DESCFUNCTION
sign(x) - returns the sign of x )
PREHOOK: query: DESCRIBE FUNCTION EXTENDED sign
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED sign
POSTHOOK: type: DESCFUNCTION
sign(x) - returns the sign of x )
Example:
   > SELECT sign(40) FROM src LIMIT 1;
  1
PREHOOK: query: explain 
select sign(0) FROM src LIMIT 1
PREHOOK: type: QUERY
POSTHOOK: query: explain 
select sign(0) FROM src LIMIT 1
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME src))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION sign 0))) (TOK_LIMIT 1)))

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: sign(0)
                    type: double
              outputColumnNames: _col0
              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: 1


PREHOOK: query: select sign(0) FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-27_267_8942791588882991640/-mr-10000
POSTHOOK: query: select sign(0) FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-27_267_8942791588882991640/-mr-10000
0.0
PREHOOK: query: select sign(-45) FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-30_576_4621808874907335472/-mr-10000
POSTHOOK: query: select sign(-45) FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-30_576_4621808874907335472/-mr-10000
-1.0
PREHOOK: query: select sign(46)  FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-33_805_4140983550923146966/-mr-10000
POSTHOOK: query: select sign(46)  FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-41-33_805_4140983550923146966/-mr-10000
1.0
PREHOOK: query: DESCRIBE FUNCTION sign
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION sign
POSTHOOK: type: DESCFUNCTION
sign(x) - returns the sign of x )
PREHOOK: query: DESCRIBE FUNCTION EXTENDED sign
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED sign
POSTHOOK: type: DESCFUNCTION
sign(x) - returns the sign of x )
Example:
   > SELECT sign(40) FROM src LIMIT 1;
  1