PREHOOK: query: CREATE TABLE T1(key STRING, val STRING)
SKEWED BY (key, val) ON ((2, 12)) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
POSTHOOK: query: CREATE TABLE T1(key STRING, val STRING)
SKEWED BY (key, val) ON ((2, 12)) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: default@T1
PREHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T1.txt' INTO TABLE T1
PREHOOK: type: LOAD
PREHOOK: Output: default@t1
POSTHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T1.txt' INTO TABLE T1
POSTHOOK: type: LOAD
POSTHOOK: Output: default@t1
PREHOOK: query: CREATE TABLE T2(key STRING, val STRING)
SKEWED BY (key) ON ((2)) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
POSTHOOK: query: CREATE TABLE T2(key STRING, val STRING)
SKEWED BY (key) ON ((2)) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: default@T2
PREHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T2.txt' INTO TABLE T2
PREHOOK: type: LOAD
PREHOOK: Output: default@t2
POSTHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T2.txt' INTO TABLE T2
POSTHOOK: type: LOAD
POSTHOOK: Output: default@t2
PREHOOK: query: -- One of the tables is skewed by 2 columns, and the other table is
-- skewed by one column. Ths join is performed on the first skewed column
-- The skewed value for the jon key is common to both the tables.
-- In this case, the skewed join value is not repeated in the filter.
-- adding a order by at the end to make the results deterministic

EXPLAIN
SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key
PREHOOK: type: QUERY
POSTHOOK: query: -- One of the tables is skewed by 2 columns, and the other table is
-- skewed by one column. Ths join is performed on the first skewed column
-- The skewed value for the jon key is common to both the tables.
-- In this case, the skewed join value is not repeated in the filter.
-- adding a order by at the end to make the results deterministic

EXPLAIN
SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_JOIN (TOK_TABREF (TOK_TABNAME T1) a) (TOK_TABREF (TOK_TABNAME T2) b) (= (. (TOK_TABLE_OR_COL a) key) (. (TOK_TABLE_OR_COL b) key)))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_ALLCOLREF (TOK_TABNAME a))) (TOK_SELEXPR (TOK_ALLCOLREF (TOK_TABNAME b))))))

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

STAGE PLANS:
  Stage: Stage-1
    Map Reduce
      Alias -> Map Operator Tree:
        subquery1:a 
          TableScan
            alias: a
            Filter Operator
              predicate:
                  expr: (not (key = '2'))
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                sort order: +
                Map-reduce partition columns:
                      expr: key
                      type: string
                tag: 0
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
        subquery1:b 
          TableScan
            alias: b
            Filter Operator
              predicate:
                  expr: (not (key = '2'))
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                sort order: +
                Map-reduce partition columns:
                      expr: key
                      type: string
                tag: 1
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
      Reduce Operator Tree:
        Join Operator
          condition map:
               Inner Join 0 to 1
          condition expressions:
            0 {VALUE._col0} {VALUE._col1}
            1 {VALUE._col0} {VALUE._col1}
          handleSkewJoin: false
          outputColumnNames: _col0, _col1, _col4, _col5
          Select Operator
            expressions:
                  expr: _col0
                  type: string
                  expr: _col1
                  type: string
                  expr: _col4
                  type: string
                  expr: _col5
                  type: string
            outputColumnNames: _col0, _col1, _col2, _col3
            File Output Operator
              compressed: false
              GlobalTableId: 0
              table:
                  input format: org.apache.hadoop.mapred.SequenceFileInputFormat
                  output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat

  Stage: Stage-2
    Map Reduce
      Alias -> Map Operator Tree:
#### A masked pattern was here ####
          TableScan
            Union
              Select Operator
                SELECT * : (no compute)
                File Output Operator
                  compressed: false
                  GlobalTableId: 0
                  table:
                      input format: org.apache.hadoop.mapred.TextInputFormat
                      output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
#### A masked pattern was here ####
          TableScan
            Union
              Select Operator
                SELECT * : (no compute)
                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-4
    Map Reduce
      Alias -> Map Operator Tree:
        a 
          TableScan
            alias: a
            Filter Operator
              predicate:
                  expr: (key = '2')
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                sort order: +
                Map-reduce partition columns:
                      expr: key
                      type: string
                tag: 0
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
        b 
          TableScan
            alias: b
            Filter Operator
              predicate:
                  expr: (key = '2')
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                sort order: +
                Map-reduce partition columns:
                      expr: key
                      type: string
                tag: 1
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
      Reduce Operator Tree:
        Join Operator
          condition map:
               Inner Join 0 to 1
          condition expressions:
            0 {VALUE._col0} {VALUE._col1}
            1 {VALUE._col0} {VALUE._col1}
          handleSkewJoin: false
          outputColumnNames: _col0, _col1, _col4, _col5
          Select Operator
            expressions:
                  expr: _col0
                  type: string
                  expr: _col1
                  type: string
                  expr: _col4
                  type: string
                  expr: _col5
                  type: string
            outputColumnNames: _col0, _col1, _col2, _col3
            File Output Operator
              compressed: false
              GlobalTableId: 0
              table:
                  input format: org.apache.hadoop.mapred.SequenceFileInputFormat
                  output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat

  Stage: Stage-0
    Fetch Operator
      limit: -1


PREHOOK: query: SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key
ORDER BY a.key, b.key, a.val, b.val
PREHOOK: type: QUERY
PREHOOK: Input: default@t1
PREHOOK: Input: default@t2
#### A masked pattern was here ####
POSTHOOK: query: SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key
ORDER BY a.key, b.key, a.val, b.val
POSTHOOK: type: QUERY
POSTHOOK: Input: default@t1
POSTHOOK: Input: default@t2
#### A masked pattern was here ####
2	12	2	22
3	13	3	13
8	18	8	18
8	18	8	18
8	28	8	18
8	28	8	18
PREHOOK: query: DROP TABLE T1
PREHOOK: type: DROPTABLE
PREHOOK: Input: default@t1
PREHOOK: Output: default@t1
POSTHOOK: query: DROP TABLE T1
POSTHOOK: type: DROPTABLE
POSTHOOK: Input: default@t1
POSTHOOK: Output: default@t1
PREHOOK: query: DROP TABLE T2
PREHOOK: type: DROPTABLE
PREHOOK: Input: default@t2
PREHOOK: Output: default@t2
POSTHOOK: query: DROP TABLE T2
POSTHOOK: type: DROPTABLE
POSTHOOK: Input: default@t2
POSTHOOK: Output: default@t2
PREHOOK: query: CREATE TABLE T1(key STRING, val STRING)
SKEWED BY (key, val) ON ((2, 12)) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
POSTHOOK: query: CREATE TABLE T1(key STRING, val STRING)
SKEWED BY (key, val) ON ((2, 12)) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: default@T1
PREHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T1.txt' INTO TABLE T1
PREHOOK: type: LOAD
PREHOOK: Output: default@t1
POSTHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T1.txt' INTO TABLE T1
POSTHOOK: type: LOAD
POSTHOOK: Output: default@t1
PREHOOK: query: CREATE TABLE T2(key STRING, val STRING)
SKEWED BY (key) ON ((2)) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
POSTHOOK: query: CREATE TABLE T2(key STRING, val STRING)
SKEWED BY (key) ON ((2)) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: default@T2
PREHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T2.txt' INTO TABLE T2
PREHOOK: type: LOAD
PREHOOK: Output: default@t2
POSTHOOK: query: LOAD DATA LOCAL INPATH '../data/files/T2.txt' INTO TABLE T2
POSTHOOK: type: LOAD
POSTHOOK: Output: default@t2
PREHOOK: query: -- One of the tables is skewed by 2 columns, and the other table is
-- skewed by one column. Ths join is performed on the both the columns
-- In this case, the skewed join value is repeated in the filter.

EXPLAIN
SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val
PREHOOK: type: QUERY
POSTHOOK: query: -- One of the tables is skewed by 2 columns, and the other table is
-- skewed by one column. Ths join is performed on the both the columns
-- In this case, the skewed join value is repeated in the filter.

EXPLAIN
SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val
POSTHOOK: type: QUERY
ABSTRACT SYNTAX TREE:
  (TOK_QUERY (TOK_FROM (TOK_JOIN (TOK_TABREF (TOK_TABNAME T1) a) (TOK_TABREF (TOK_TABNAME T2) b) (and (= (. (TOK_TABLE_OR_COL a) key) (. (TOK_TABLE_OR_COL b) key)) (= (. (TOK_TABLE_OR_COL a) val) (. (TOK_TABLE_OR_COL b) val))))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_ALLCOLREF (TOK_TABNAME a))) (TOK_SELEXPR (TOK_ALLCOLREF (TOK_TABNAME b))))))

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

STAGE PLANS:
  Stage: Stage-1
    Map Reduce
      Alias -> Map Operator Tree:
        subquery1:a 
          TableScan
            alias: a
            Filter Operator
              predicate:
                  expr: (not (((key = '2') and (val = '12')) or (key = '2')))
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
                sort order: ++
                Map-reduce partition columns:
                      expr: key
                      type: string
                      expr: val
                      type: string
                tag: 0
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
        subquery1:b 
          TableScan
            alias: b
            Filter Operator
              predicate:
                  expr: (not (((key = '2') and (val = '12')) or (key = '2')))
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
                sort order: ++
                Map-reduce partition columns:
                      expr: key
                      type: string
                      expr: val
                      type: string
                tag: 1
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
      Reduce Operator Tree:
        Join Operator
          condition map:
               Inner Join 0 to 1
          condition expressions:
            0 {VALUE._col0} {VALUE._col1}
            1 {VALUE._col0} {VALUE._col1}
          handleSkewJoin: false
          outputColumnNames: _col0, _col1, _col4, _col5
          Select Operator
            expressions:
                  expr: _col0
                  type: string
                  expr: _col1
                  type: string
                  expr: _col4
                  type: string
                  expr: _col5
                  type: string
            outputColumnNames: _col0, _col1, _col2, _col3
            File Output Operator
              compressed: false
              GlobalTableId: 0
              table:
                  input format: org.apache.hadoop.mapred.SequenceFileInputFormat
                  output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat

  Stage: Stage-2
    Map Reduce
      Alias -> Map Operator Tree:
#### A masked pattern was here ####
          TableScan
            Union
              Select Operator
                SELECT * : (no compute)
                File Output Operator
                  compressed: false
                  GlobalTableId: 0
                  table:
                      input format: org.apache.hadoop.mapred.TextInputFormat
                      output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
#### A masked pattern was here ####
          TableScan
            Union
              Select Operator
                SELECT * : (no compute)
                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-4
    Map Reduce
      Alias -> Map Operator Tree:
        a 
          TableScan
            alias: a
            Filter Operator
              predicate:
                  expr: (((key = '2') and (val = '12')) or (key = '2'))
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
                sort order: ++
                Map-reduce partition columns:
                      expr: key
                      type: string
                      expr: val
                      type: string
                tag: 0
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
        b 
          TableScan
            alias: b
            Filter Operator
              predicate:
                  expr: (((key = '2') and (val = '12')) or (key = '2'))
                  type: boolean
              Reduce Output Operator
                key expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
                sort order: ++
                Map-reduce partition columns:
                      expr: key
                      type: string
                      expr: val
                      type: string
                tag: 1
                value expressions:
                      expr: key
                      type: string
                      expr: val
                      type: string
      Reduce Operator Tree:
        Join Operator
          condition map:
               Inner Join 0 to 1
          condition expressions:
            0 {VALUE._col0} {VALUE._col1}
            1 {VALUE._col0} {VALUE._col1}
          handleSkewJoin: false
          outputColumnNames: _col0, _col1, _col4, _col5
          Select Operator
            expressions:
                  expr: _col0
                  type: string
                  expr: _col1
                  type: string
                  expr: _col4
                  type: string
                  expr: _col5
                  type: string
            outputColumnNames: _col0, _col1, _col2, _col3
            File Output Operator
              compressed: false
              GlobalTableId: 0
              table:
                  input format: org.apache.hadoop.mapred.SequenceFileInputFormat
                  output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat

  Stage: Stage-0
    Fetch Operator
      limit: -1

PREHOOK: query: SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val
ORDER BY a.key, b.key, a.val, b.val
PREHOOK: type: QUERY
PREHOOK: Input: default@t1
PREHOOK: Input: default@t2
#### A masked pattern was here ####
POSTHOOK: query: SELECT a.*, b.* FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val
ORDER BY a.key, b.key, a.val, b.val
POSTHOOK: type: QUERY
POSTHOOK: Input: default@t1
POSTHOOK: Input: default@t2
#### A masked pattern was here ####
3	13	3	13
8	18	8	18
8	18	8	18