PREHOOK: query: -- SORT_QUERY_RESULTS CREATE TABLE T1(key STRING, val STRING) SKEWED BY (key) ON ((2), (7)) STORED AS TEXTFILE PREHOOK: type: CREATETABLE PREHOOK: Output: database:default PREHOOK: Output: default@T1 POSTHOOK: query: -- SORT_QUERY_RESULTS CREATE TABLE T1(key STRING, val STRING) SKEWED BY (key) ON ((2), (7)) 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) SKEWED BY (key) ON ((3), (8)) STORED AS TEXTFILE PREHOOK: type: CREATETABLE PREHOOK: Output: database:default PREHOOK: Output: default@T2 POSTHOOK: query: CREATE TABLE T2(key STRING, val STRING) SKEWED BY (key) ON ((3), (8)) 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: -- a simple query with skew on both the tables on the join key -- multiple skew values are present for the skewed keys -- but the skewed values do not overlap. -- The join values are a superset of the skewed keys. -- 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 and a.val = b.val PREHOOK: type: QUERY POSTHOOK: query: -- a simple query with skew on both the tables on the join key -- multiple skew values are present for the skewed keys -- but the skewed values do not overlap. -- The join values are a superset of the skewed keys. -- 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 and a.val = b.val POSTHOOK: type: QUERY STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 STAGE PLANS: Stage: Stage-1 Spark Edges: Reducer 2 <- Map 1 (PARTITION-LEVEL SORT, 2), Map 3 (PARTITION-LEVEL SORT, 2) Reducer 5 <- Map 4 (PARTITION-LEVEL SORT, 2), Map 6 (PARTITION-LEVEL SORT, 2) #### A masked pattern was here #### Vertices: Map 1 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) and ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 3 Map Operator Tree: TableScan alias: b 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) and ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 4 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) and (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 6 Map Operator Tree: TableScan alias: b 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) and (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reducer 2 Reduce Operator Tree: Join Operator condition map: Inner Join 0 to 1 outputColumnNames: _col0, _col1, _col5, _col6 Select Operator expressions: _col0 (type: string), _col1 (type: string), _col5 (type: string), _col6 (type: string) outputColumnNames: _col0, _col1, _col2, _col3 File Output Operator compressed: false 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 Reducer 5 Reduce Operator Tree: Join Operator condition map: Inner Join 0 to 1 outputColumnNames: _col0, _col1, _col5, _col6 Select Operator expressions: _col0 (type: string), _col1 (type: string), _col5 (type: string), _col6 (type: string) outputColumnNames: _col0, _col1, _col2, _col3 File Output Operator compressed: false 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 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 PREHOOK: query: -- test outer joins also EXPLAIN SELECT a.*, b.* FROM T1 a LEFT OUTER JOIN T2 b ON a.key = b.key and a.val = b.val PREHOOK: type: QUERY POSTHOOK: query: -- test outer joins also EXPLAIN SELECT a.*, b.* FROM T1 a LEFT OUTER JOIN T2 b ON a.key = b.key and a.val = b.val POSTHOOK: type: QUERY STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 STAGE PLANS: Stage: Stage-1 Spark Edges: Reducer 2 <- Map 1 (PARTITION-LEVEL SORT, 2), Map 3 (PARTITION-LEVEL SORT, 2) Reducer 5 <- Map 4 (PARTITION-LEVEL SORT, 2), Map 6 (PARTITION-LEVEL SORT, 2) #### A masked pattern was here #### Vertices: Map 1 Map Operator Tree: TableScan alias: a Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 3 Map Operator Tree: TableScan alias: b Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 4 Map Operator Tree: TableScan alias: a Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 6 Map Operator Tree: TableScan alias: b Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reducer 2 Reduce Operator Tree: Join Operator condition map: Left Outer Join0 to 1 outputColumnNames: _col0, _col1, _col5, _col6 Select Operator expressions: _col0 (type: string), _col1 (type: string), _col5 (type: string), _col6 (type: string) outputColumnNames: _col0, _col1, _col2, _col3 File Output Operator compressed: false 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 Reducer 5 Reduce Operator Tree: Join Operator condition map: Left Outer Join0 to 1 outputColumnNames: _col0, _col1, _col5, _col6 Select Operator expressions: _col0 (type: string), _col1 (type: string), _col5 (type: string), _col6 (type: string) outputColumnNames: _col0, _col1, _col2, _col3 File Output Operator compressed: false 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 a.*, b.* FROM T1 a LEFT OUTER 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 LEFT OUTER 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 #### 1 11 NULL NULL 2 12 NULL NULL 3 13 3 13 7 17 NULL NULL 8 18 8 18 8 18 8 18 8 28 NULL NULL PREHOOK: query: -- a group by at the end should not change anything EXPLAIN SELECT a.key, count(1) FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key PREHOOK: type: QUERY POSTHOOK: query: -- a group by at the end should not change anything EXPLAIN SELECT a.key, count(1) FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key POSTHOOK: type: QUERY STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 STAGE PLANS: Stage: Stage-1 Spark Edges: Reducer 2 <- Map 1 (PARTITION-LEVEL SORT, 2), Map 4 (PARTITION-LEVEL SORT, 2) Reducer 6 <- Map 5 (PARTITION-LEVEL SORT, 2), Map 7 (PARTITION-LEVEL SORT, 2) Reducer 3 <- Reducer 2 (GROUP, 2), Reducer 6 (GROUP, 2) #### A masked pattern was here #### Vertices: Map 1 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) and ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 4 Map Operator Tree: TableScan alias: b 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) and ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 5 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) and (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 7 Map Operator Tree: TableScan alias: b 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) and (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reducer 2 Reduce Operator Tree: Join Operator condition map: Inner Join 0 to 1 outputColumnNames: _col0 Group By Operator aggregations: count(1) keys: _col0 (type: string) mode: hash outputColumnNames: _col0, _col1 Reduce Output Operator key expressions: _col0 (type: string) sort order: + Map-reduce partition columns: _col0 (type: string) value expressions: _col1 (type: bigint) Reducer 3 Reduce Operator Tree: Group By Operator aggregations: count(VALUE._col0) keys: KEY._col0 (type: string) mode: mergepartial outputColumnNames: _col0, _col1 Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Select Operator expressions: _col0 (type: string), _col1 (type: bigint) outputColumnNames: _col0, _col1 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 Reducer 6 Reduce Operator Tree: Join Operator condition map: Inner Join 0 to 1 outputColumnNames: _col0 Group By Operator aggregations: count(1) keys: _col0 (type: string) mode: hash outputColumnNames: _col0, _col1 Reduce Output Operator key expressions: _col0 (type: string) sort order: + Map-reduce partition columns: _col0 (type: string) value expressions: _col1 (type: bigint) Stage: Stage-0 Fetch Operator limit: -1 Processor Tree: ListSink PREHOOK: query: SELECT a.key, count(1) FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key PREHOOK: type: QUERY PREHOOK: Input: default@t1 PREHOOK: Input: default@t2 #### A masked pattern was here #### POSTHOOK: query: SELECT a.key, count(1) FROM T1 a JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key POSTHOOK: type: QUERY POSTHOOK: Input: default@t1 POSTHOOK: Input: default@t2 #### A masked pattern was here #### 3 1 8 2 PREHOOK: query: EXPLAIN SELECT a.key, count(1) FROM T1 a LEFT OUTER JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key PREHOOK: type: QUERY POSTHOOK: query: EXPLAIN SELECT a.key, count(1) FROM T1 a LEFT OUTER JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key POSTHOOK: type: QUERY STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 STAGE PLANS: Stage: Stage-1 Spark Edges: Reducer 2 <- Map 1 (PARTITION-LEVEL SORT, 2), Map 4 (PARTITION-LEVEL SORT, 2) Reducer 6 <- Map 5 (PARTITION-LEVEL SORT, 2), Map 7 (PARTITION-LEVEL SORT, 2) Reducer 3 <- Reducer 2 (GROUP, 2), Reducer 6 (GROUP, 2) #### A masked pattern was here #### Vertices: Map 1 Map Operator Tree: TableScan alias: a Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 4 Map Operator Tree: TableScan alias: b Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8')) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 5 Map Operator Tree: TableScan alias: a Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Map 7 Map Operator Tree: TableScan alias: b Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Filter Operator predicate: (not ((((key = '2') or (key = '7')) or (key = '3')) or (key = '8'))) (type: boolean) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: key (type: string), val (type: string) sort order: ++ Map-reduce partition columns: key (type: string), val (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reducer 2 Reduce Operator Tree: Join Operator condition map: Left Outer Join0 to 1 outputColumnNames: _col0 Group By Operator aggregations: count(1) keys: _col0 (type: string) mode: hash outputColumnNames: _col0, _col1 Reduce Output Operator key expressions: _col0 (type: string) sort order: + Map-reduce partition columns: _col0 (type: string) value expressions: _col1 (type: bigint) Reducer 3 Reduce Operator Tree: Group By Operator aggregations: count(VALUE._col0) keys: KEY._col0 (type: string) mode: mergepartial outputColumnNames: _col0, _col1 Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Select Operator expressions: _col0 (type: string), _col1 (type: bigint) outputColumnNames: _col0, _col1 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 Reducer 6 Reduce Operator Tree: Join Operator condition map: Left Outer Join0 to 1 outputColumnNames: _col0 Group By Operator aggregations: count(1) keys: _col0 (type: string) mode: hash outputColumnNames: _col0, _col1 Reduce Output Operator key expressions: _col0 (type: string) sort order: + Map-reduce partition columns: _col0 (type: string) value expressions: _col1 (type: bigint) Stage: Stage-0 Fetch Operator limit: -1 Processor Tree: ListSink PREHOOK: query: SELECT a.key, count(1) FROM T1 a LEFT OUTER JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key PREHOOK: type: QUERY PREHOOK: Input: default@t1 PREHOOK: Input: default@t2 #### A masked pattern was here #### POSTHOOK: query: SELECT a.key, count(1) FROM T1 a LEFT OUTER JOIN T2 b ON a.key = b.key and a.val = b.val group by a.key POSTHOOK: type: QUERY POSTHOOK: Input: default@t1 POSTHOOK: Input: default@t2 #### A masked pattern was here #### 1 1 2 1 3 1 7 1 8 3