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[GitHub] [hive] dengzhhu653 opened a new pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
dengzhhu653 opened a new pull request #2585:
URL: https://github.com/apache/hive/pull/2585
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[GitHub] [hive] dengzhhu653 edited a comment on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 edited a comment on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-1048902780
I found something interesting, when I explain `select col1, count(distinct col2) from partition_distinct_skew group by col1;` on master branch, the output is following:
```
Vertices:
Map 1
Map Operator Tree:
TableScan
alias: partition_distinct_skew
Statistics: Num rows: 3 Data size: 510 Basic stats: COMPLETE Column stats: COMPLETE
Select Operator
expressions: col1 (type: string), col2 (type: string)
outputColumnNames: col1, col2
Statistics: Num rows: 3 Data size: 510 Basic stats: COMPLETE Column stats: COMPLETE
Group By Operator
keys: col1 (type: string), col2 (type: string)
minReductionHashAggr: 0.4
mode: hash
outputColumnNames: _col0, _col1
Statistics: Num rows: 2 Data size: 340 Basic stats: COMPLETE Column stats: COMPLETE
Reduce Output Operator
key expressions: _col0 (type: string), _col1 (type: string)
null sort order: zz
sort order: ++
Map-reduce partition columns: rand() (type: double)
Statistics: Num rows: 2 Data size: 340 Basic stats: COMPLETE Column stats: COMPLETE
```
The partition column is **rand()** for this case. It's seems we have done something to improve the skew case, though I'm not able to find where the cause locates.
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[GitHub] [hive] github-actions[bot] closed pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #2585:
URL: https://github.com/apache/hive/pull/2585
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[GitHub] [hive] github-actions[bot] closed pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #2585:
URL: https://github.com/apache/hive/pull/2585
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[GitHub] [hive] kgyrtkirk commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
kgyrtkirk commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-975438145
@dengzhhu653 do you happen to have a testcase for this?
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[GitHub] [hive] dengzhhu653 commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-1048902780
I found something interesting, when I explain `select col1, count(distinct col2) from partition_distinct_skew group by col1;` on master branch, the output is following:
```
Vertices:
Map 1
Map Operator Tree:
TableScan
alias: partition_distinct_skew
Statistics: Num rows: 3 Data size: 510 Basic stats: COMPLETE Column stats: COMPLETE
Select Operator
expressions: col1 (type: string), col2 (type: string)
outputColumnNames: col1, col2
Statistics: Num rows: 3 Data size: 510 Basic stats: COMPLETE Column stats: COMPLETE
Group By Operator
keys: col1 (type: string), col2 (type: string)
minReductionHashAggr: 0.4
mode: hash
outputColumnNames: _col0, _col1
Statistics: Num rows: 2 Data size: 340 Basic stats: COMPLETE Column stats: COMPLETE
Reduce Output Operator
key expressions: _col0 (type: string), _col1 (type: string)
null sort order: zz
sort order: ++
Map-reduce partition columns: rand() (type: double)
Statistics: Num rows: 2 Data size: 340 Basic stats: COMPLETE Column stats: COMPLETE
```
The partition column is **rand()** for this case. it's seems we have done something to improve the skew case, though I not able to find where the cause locates.
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[GitHub] [hive] dengzhhu653 commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-975448819
> @dengzhhu653 do you happen to have a testcase for this?
Not yet, I have tested on our environment for the skew table, shows that it can get pretty performance gain(mr).
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[GitHub] [hive] github-actions[bot] commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-1027414846
This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.
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[GitHub] [hive] dengzhhu653 commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-938688401
Hey @pgaref, mind taking a look if have secs?
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[GitHub] [hive] dengzhhu653 commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-985433461
> > @dengzhhu653 do you happen to have a testcase for this?
>
> Not yet, I have tested on our environment for the skew table, shows that it can get pretty performance gain(mr).
Hi @kgyrtkirk, what do you think about this? there are also some tests like [groupby11.q](https://github.com/apache/hive/blob/7b3ecf617a6d46f48a3b6f77e0339fd4ad95a420/ql/src/test/queries/clientpositive/groupby11.q) and [groupby8_map_skew.q](https://github.com/apache/hive/blob/7b3ecf617a6d46f48a3b6f77e0339fd4ad95a420/ql/src/test/queries/clientpositive/groupby8_map_skew.q) showing the changes in partition columns after applying the fix. Thank you!
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[GitHub] [hive] dengzhhu653 commented on a change in pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on a change in pull request #2585:
URL: https://github.com/apache/hive/pull/2585#discussion_r813487836
##########
File path: ql/src/test/results/clientpositive/llap/partition_distinct_skew.q.out
##########
@@ -0,0 +1,261 @@
+PREHOOK: query: create table partition_distinct_skew(col1 string, col2 string)
+PREHOOK: type: CREATETABLE
+PREHOOK: Output: database:default
+PREHOOK: Output: default@partition_distinct_skew
+POSTHOOK: query: create table partition_distinct_skew(col1 string, col2 string)
+POSTHOOK: type: CREATETABLE
+POSTHOOK: Output: database:default
+POSTHOOK: Output: default@partition_distinct_skew
+PREHOOK: query: insert into table partition_distinct_skew values('a', 'b'), ('a', 'a'), ('a', 'b')
+PREHOOK: type: QUERY
+PREHOOK: Input: _dummy_database@_dummy_table
+PREHOOK: Output: default@partition_distinct_skew
+POSTHOOK: query: insert into table partition_distinct_skew values('a', 'b'), ('a', 'a'), ('a', 'b')
+POSTHOOK: type: QUERY
+POSTHOOK: Input: _dummy_database@_dummy_table
+POSTHOOK: Output: default@partition_distinct_skew
+POSTHOOK: Lineage: partition_distinct_skew.col1 SCRIPT []
+POSTHOOK: Lineage: partition_distinct_skew.col2 SCRIPT []
+PREHOOK: query: select col1, col2 from partition_distinct_skew
+PREHOOK: type: QUERY
+PREHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+POSTHOOK: query: select col1, col2 from partition_distinct_skew
+POSTHOOK: type: QUERY
+POSTHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+a b
+a a
+a b
+PREHOOK: query: explain select col1, count(distinct col2), count(col2) from partition_distinct_skew group by col1
+PREHOOK: type: QUERY
+PREHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+POSTHOOK: query: explain select col1, count(distinct col2), count(col2) from partition_distinct_skew group by col1
+POSTHOOK: type: QUERY
+POSTHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+STAGE DEPENDENCIES:
+ Stage-1 is a root stage
+ Stage-0 depends on stages: Stage-1
+
+STAGE PLANS:
+ Stage: Stage-1
+ Tez
+#### A masked pattern was here ####
+ Edges:
+ Reducer 2 <- Map 1 (SIMPLE_EDGE)
+ Reducer 3 <- Reducer 2 (SIMPLE_EDGE)
+#### A masked pattern was here ####
+ Vertices:
+ Map 1
+ Map Operator Tree:
+ TableScan
+ alias: partition_distinct_skew
+ Statistics: Num rows: 3 Data size: 510 Basic stats: COMPLETE Column stats: COMPLETE
+ Select Operator
+ expressions: col1 (type: string), col2 (type: string)
+ outputColumnNames: col1, col2
+ Statistics: Num rows: 3 Data size: 510 Basic stats: COMPLETE Column stats: COMPLETE
+ Group By Operator
+ aggregations: count(DISTINCT col2), count(col2)
+ keys: col1 (type: string), col2 (type: string)
+ minReductionHashAggr: 0.4
+ mode: hash
+ outputColumnNames: _col0, _col1, _col2, _col3
+ Statistics: Num rows: 2 Data size: 372 Basic stats: COMPLETE Column stats: COMPLETE
+ Reduce Output Operator
+ key expressions: _col0 (type: string), _col1 (type: string)
+ null sort order: zz
+ sort order: ++
+ Map-reduce partition columns: _col0 (type: string), _col1 (type: string)
+ Statistics: Num rows: 2 Data size: 372 Basic stats: COMPLETE Column stats: COMPLETE
+ value expressions: _col3 (type: bigint)
+ Execution mode: vectorized, llap
+ LLAP IO: all inputs
+ Reducer 2
+ Execution mode: llap
+ Reduce Operator Tree:
+ Group By Operator
+ aggregations: count(DISTINCT KEY._col1:0._col0), count(VALUE._col1)
+ keys: KEY._col0 (type: string)
+ mode: partials
+ outputColumnNames: _col0, _col1, _col2
+ Statistics: Num rows: 2 Data size: 202 Basic stats: COMPLETE Column stats: COMPLETE
+ Reduce Output Operator
+ key expressions: _col0 (type: string)
+ null sort order: z
+ sort order: +
+ Map-reduce partition columns: _col0 (type: string)
+ Statistics: Num rows: 2 Data size: 202 Basic stats: COMPLETE Column stats: COMPLETE
+ value expressions: _col1 (type: bigint), _col2 (type: bigint)
+ Reducer 3
+ Execution mode: llap
+ Reduce Operator Tree:
+ Group By Operator
+ aggregations: count(VALUE._col0), count(VALUE._col1)
+ keys: KEY._col0 (type: string)
+ mode: final
+ outputColumnNames: _col0, _col1, _col2
+ Statistics: Num rows: 1 Data size: 101 Basic stats: COMPLETE Column stats: COMPLETE
+ File Output Operator
+ compressed: false
+ Statistics: Num rows: 1 Data size: 101 Basic stats: COMPLETE Column stats: COMPLETE
+ table:
+ input format: org.apache.hadoop.mapred.SequenceFileInputFormat
+ output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
+ serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
+
+ Stage: Stage-0
+ Fetch Operator
+ limit: -1
+ Processor Tree:
+ ListSink
+
+PREHOOK: query: select col1, count(distinct col2), count(col2) from partition_distinct_skew group by col1
+PREHOOK: type: QUERY
+PREHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+POSTHOOK: query: select col1, count(distinct col2), count(col2) from partition_distinct_skew group by col1
+POSTHOOK: type: QUERY
+POSTHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+a 2 3
+PREHOOK: query: explain select col1, count(distinct col2) from partition_distinct_skew group by col1
+PREHOOK: type: QUERY
+PREHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+POSTHOOK: query: explain select col1, count(distinct col2) from partition_distinct_skew group by col1
+POSTHOOK: type: QUERY
+POSTHOOK: Input: default@partition_distinct_skew
+#### A masked pattern was here ####
+STAGE DEPENDENCIES:
+ Stage-1 is a root stage
+ Stage-0 depends on stages: Stage-1
+
+STAGE PLANS:
+ Stage: Stage-1
+ Tez
+#### A masked pattern was here ####
+ Edges:
+ Reducer 2 <- Map 1 (SIMPLE_EDGE)
+ Reducer 3 <- Reducer 2 (SIMPLE_EDGE)
+ Reducer 4 <- Reducer 3 (SIMPLE_EDGE)
+ Reducer 5 <- Reducer 4 (SIMPLE_EDGE)
+#### A masked pattern was here ####
Review comment:
The plan of `select col1, count(distinct col2) from partition_distinct_skew group by col1` introduces some redundant reducers.
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[GitHub] [hive] dengzhhu653 commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-918013599
@kasakrisz cloud you please take a look at the changes ?
Thanks,
Zhihua Deng
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[GitHub] [hive] dengzhhu653 commented on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 commented on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-899965525
Hi @kgyrtkirk @zabetak, cloud you please take a look if have secs?
Thanks!
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[GitHub] [hive] dengzhhu653 removed a comment on pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
dengzhhu653 removed a comment on pull request #2585:
URL: https://github.com/apache/hive/pull/2585#issuecomment-918013599
@kasakrisz cloud you please take a look at the changes ?
Thanks,
Zhihua Deng
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[GitHub] [hive] kgyrtkirk commented on a change in pull request #2585: HIVE-25448: Invalid partition columns when skew with distinct
Posted by GitBox <gi...@apache.org>.
kgyrtkirk commented on a change in pull request #2585:
URL: https://github.com/apache/hive/pull/2585#discussion_r812739484
##########
File path: ql/src/test/results/clientpositive/llap/autoColumnStats_7.q.out
##########
@@ -56,7 +56,7 @@ STAGE PLANS:
key expressions: _col0 (type: string), _col1 (type: string)
null sort order: zz
sort order: ++
- Map-reduce partition columns: _col0 (type: string)
+ Map-reduce partition columns: _col0 (type: string), _col1 (type: string)
Review comment:
do you happen to have a directed testcase which were working incorrectly before this patch?
I guess it was returning 3 for distinct in case the rows were in the order of:
```
a | b
a | a
a | b
```
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