PREHOOK: query: CREATE TABLE T1(key STRING, val STRING) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
PREHOOK: Output: database:default
PREHOOK: Output: default@T1
POSTHOOK: query: CREATE TABLE T1(key STRING, val STRING) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: database:default
POSTHOOK: Output: default@T1
PREHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T1
PREHOOK: type: LOAD
#### A masked pattern was here ####
PREHOOK: Output: default@t1
POSTHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T1
POSTHOOK: type: LOAD
#### A masked pattern was here ####
POSTHOOK: Output: default@t1
PREHOOK: query: CREATE TABLE T2(key STRING, val STRING) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
PREHOOK: Output: database:default
PREHOOK: Output: default@T2
POSTHOOK: query: CREATE TABLE T2(key STRING, val STRING) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: database:default
POSTHOOK: Output: default@T2
PREHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T2.txt' INTO TABLE T2
PREHOOK: type: LOAD
#### A masked pattern was here ####
PREHOOK: Output: default@t2
POSTHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T2.txt' INTO TABLE T2
POSTHOOK: type: LOAD
#### A masked pattern was here ####
POSTHOOK: Output: default@t2
PREHOOK: query: CREATE TABLE T3(key STRING, val STRING)
SKEWED BY (val) ON ((12)) STORED AS TEXTFILE
PREHOOK: type: CREATETABLE
PREHOOK: Output: database:default
PREHOOK: Output: default@T3
POSTHOOK: query: CREATE TABLE T3(key STRING, val STRING)
SKEWED BY (val) ON ((12)) STORED AS TEXTFILE
POSTHOOK: type: CREATETABLE
POSTHOOK: Output: database:default
POSTHOOK: Output: default@T3
PREHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T3.txt' INTO TABLE T3
PREHOOK: type: LOAD
#### A masked pattern was here ####
PREHOOK: Output: default@t3
POSTHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T3.txt' INTO TABLE T3
POSTHOOK: type: LOAD
#### A masked pattern was here ####
POSTHOOK: Output: default@t3
PREHOOK: query: -- This test is for skewed join compile time optimization for more than 2 tables.
-- The join key for table 3 is different from the join key used for joining
-- tables 1 and 2. Table 3 is skewed, but since one of the join sources for table
-- 3 consist of a sub-query which contains a join, the compile time skew join 
-- optimization is not performed
-- adding a order by at the end to make the results deterministic

EXPLAIN
select *
from 
T1 a join T2 b on a.key = b.key 
join T3 c on a.val = c.val
PREHOOK: type: QUERY
POSTHOOK: query: -- This test is for skewed join compile time optimization for more than 2 tables.
-- The join key for table 3 is different from the join key used for joining
-- tables 1 and 2. Table 3 is skewed, but since one of the join sources for table
-- 3 consist of a sub-query which contains a join, the compile time skew join 
-- optimization is not performed
-- adding a order by at the end to make the results deterministic

EXPLAIN
select *
from 
T1 a join T2 b on a.key = b.key 
join T3 c on a.val = c.val
POSTHOOK: type: QUERY
STAGE DEPENDENCIES:
  Stage-1 is a root stage
  Stage-2 depends on stages: Stage-1
  Stage-0 depends on stages: Stage-2

STAGE PLANS:
  Stage: Stage-1
    Map Reduce
      Map Operator Tree:
          TableScan
            alias: a
            Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE
            Filter Operator
              predicate: (key is not null and val is not null) (type: boolean)
              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
              Reduce Output Operator
                key expressions: key (type: string)
                sort order: +
                Map-reduce partition columns: key (type: string)
                Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
                value expressions: val (type: string)
          TableScan
            alias: b
            Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE
            Filter Operator
              predicate: key is not null (type: boolean)
              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
              Reduce Output Operator
                key expressions: key (type: string)
                sort order: +
                Map-reduce partition columns: key (type: string)
                Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
                value expressions: val (type: string)
      Reduce Operator Tree:
        Join Operator
          condition map:
               Inner Join 0 to 1
          keys:
            0 key (type: string)
            1 key (type: string)
          outputColumnNames: _col0, _col1, _col5, _col6
          Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
          File Output Operator
            compressed: false
            table:
                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
                serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe

  Stage: Stage-2
    Map Reduce
      Map Operator Tree:
          TableScan
            Reduce Output Operator
              key expressions: _col1 (type: string)
              sort order: +
              Map-reduce partition columns: _col1 (type: string)
              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
              value expressions: _col0 (type: string), _col5 (type: string), _col6 (type: string)
          TableScan
            alias: c
            Statistics: Num rows: 0 Data size: 20 Basic stats: PARTIAL Column stats: NONE
            Filter Operator
              predicate: val is not null (type: boolean)
              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
              Reduce Output Operator
                key expressions: val (type: string)
                sort order: +
                Map-reduce partition columns: val (type: string)
                Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
                value expressions: key (type: string)
      Reduce Operator Tree:
        Join Operator
          condition map:
               Inner Join 0 to 1
          keys:
            0 _col1 (type: string)
            1 val (type: string)
          outputColumnNames: _col0, _col1, _col5, _col6, _col10, _col11
          Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
          Select Operator
            expressions: _col0 (type: string), _col1 (type: string), _col5 (type: string), _col6 (type: string), _col10 (type: string), _col11 (type: string)
            outputColumnNames: _col0, _col1, _col2, _col3, _col4, _col5
            Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
            File Output Operator
              compressed: false
              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
              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 *
from 
T1 a join T2 b on a.key = b.key 
join T3 c on a.val = c.val
order by a.key, b.key, c.key, a.val, b.val, c.val
PREHOOK: type: QUERY
PREHOOK: Input: default@t1
PREHOOK: Input: default@t2
PREHOOK: Input: default@t3
#### A masked pattern was here ####
POSTHOOK: query: select *
from 
T1 a join T2 b on a.key = b.key 
join T3 c on a.val = c.val
order by a.key, b.key, c.key, a.val, b.val, c.val
POSTHOOK: type: QUERY
POSTHOOK: Input: default@t1
POSTHOOK: Input: default@t2
POSTHOOK: Input: default@t3
#### A masked pattern was here ####
2	12	2	22	2	12