Optimize const grouping keys by mlyublena · Pull Request #17642 · prestodb/presto

mlyublena · 2022-04-13T23:09:32Z

Move constant grouping keys into a Project node above the group by, for example:

SELECT userid, 'constant val' AS extra, COUNT(1) as cnt from T GROUP BY 1, 2

into

SELECT userid,  'constant val' as extra, cnt from (SELECT userid, AS extra, COUNT(1) from T GROUP BY 1) s

Test plan

linux-foundation-easycla · 2022-04-13T23:09:34Z

The committers listed above are authorized under a signed CLA.

✅ login: mlyublena (612ae0390b34baf1fa04f7edb026ec85e58b84c7)

kaikalur

Also squash the commits

presto-main/src/main/java/com/facebook/presto/SystemSessionProperties.java

kaikalur · 2022-04-14T21:48:51Z

presto-main/src/main/java/com/facebook/presto/SystemSessionProperties.java

Fix wording

thanks, will do, copy-paste error

kaikalur · 2022-04-14T21:49:47Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

I believe we have a isConst method in ExpressionUtils?

yes, thank you!

done: the utility function expects Expression, I added a wrapper below

mlyublena · 2022-04-14T22:00:14Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

@kaikalur is there a way to check if a variable reference is a constant without hard-coding the type of child node? that would miss cases when the constant is introduced further down in the tree, or is the result of a filter. Not sure if we support that type of property/constraint derivation?

We are always rewriting the plans through all the optimizations so maybe just doing this at the end (just before exchanges) will do it. And I think this is the way to capture the children.

I think the way to do that would be to have additional "pull up constant" rules for other node types. We can run all of them until the constant is as far up in the plan as it goes.

kaikalur · 2022-04-18T20:18:39Z

presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestQueries.java

You might want to add the expected one as well - for example:

select 'blah', * from (select regiokey, count(*) from nation group by regionkey)

So it is more obvious.

rschlussel · 2022-04-18T21:04:07Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

static import isConstant

Our style is to use static imports unless it would not be obvious without the fully qualified name

rschlussel · 2022-04-18T21:06:29Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

I think the way to do that would be to have additional "pull up constant" rules for other node types. We can run all of them until the constant is as far up in the plan as it goes.

rschlussel · 2022-04-18T21:08:41Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

instead override the method "isEnabled"

rschlussel · 2022-04-18T21:15:15Z

presto-main/src/main/java/com/facebook/presto/sql/planner/PlanOptimizers.java

this doesn't need a special variable since it only adds one rule

rschlussel · 2022-04-18T21:17:04Z

presto-main/src/main/java/com/facebook/presto/sql/planner/PlanOptimizers.java

I would actually tag this on to some other block of rules. It doesn't need to be off by itself. Also, make sure inlineProjections gets called after this (InlineProjections and RemoveRedundantIdentityProject).

rschlussel · 2022-04-18T21:50:42Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

this spacing isn't correct. the arguments here should be indented another level

rschlussel · 2022-04-18T21:54:21Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

static import Function.identity()

rschlussel · 2022-04-18T22:01:25Z

...-main/src/main/java/com/facebook/presto/sql/planner/iterative/rule/GroupByWithConstants.java

In the pattern you also need to check that the aggregation only has a single grouping set. Then you should add a test that shows the optimization is not applied if there is more than one grouping set

done + added a new test

rschlussel · 2022-04-18T22:04:08Z

...n/src/test/java/com/facebook/presto/sql/planner/iterative/rule/TestGroupByWithConstants.java

all names should be camel case so testNotApplicable(). Also, add a more descriptive name (even if it's kind of long), as we want to also test other not applicable cases, and it should be obvious from looking at the test name exactly what is being tested e.g. all the not applicable tests could be testXXXDoesNotFier()

rschlussel · 2022-04-18T22:04:49Z

...n/src/test/java/com/facebook/presto/sql/planner/iterative/rule/TestGroupByWithConstants.java

Some additional cases to test

does not fire with the flag disabled

multiple constants

if only some constants aren't in the aggregation output, they don't get projected, but other constants do

Multiple grouping sets

added 1,2&4
having issues with plan matching for # 3 (let's discuss offline)

kaikalur · 2022-04-20T23:49:42Z

.../src/main/java/com/facebook/presto/sql/planner/iterative/rule/PullConstantsAboveGroupBy.java

Since we use source of an aggregation, I think it will be good to use that same terminology here instead of child so it's easier to understand.

kaikalur · 2022-04-21T00:00:44Z

.../src/main/java/com/facebook/presto/sql/planner/iterative/rule/PullConstantsAboveGroupBy.java

And you should rewrite the child to drop the constant assignment and outputs

this is not always correct, the constant variable may be used as an argument to one of the agg functions, for example

select avg(x) from (select 1 as x) group by x;

I think pruning unused columns should be done separately as it may show up in other cases as well

You can call PruneUnreferencedOutputs after this optimizer runs

rschlussel

minor comments, but looks great

rschlussel · 2022-04-21T14:41:34Z

.../test/java/com/facebook/presto/sql/planner/iterative/rule/TestPullConstantsAboveGroupBy.java

give this a descriptive name e.g. testSingleConstColumn

rschlussel · 2022-04-21T14:42:31Z

.../test/java/com/facebook/presto/sql/planner/iterative/rule/TestPullConstantsAboveGroupBy.java

static import expression

rschlussel · 2022-04-25T16:19:42Z

@mlyublena you still need to sign the CLA

rschlussel · 2022-05-06T20:35:13Z

Sorry, noticed the commit message title is too long and I don't think I have permission to update your branch myself. We follow https://cbea.ms/git-commit/ for our commit guidelines.

Can you change the commit title to "Move constant grouping keys above the group by" and put "For example" on the next line?

yingsu00

@mlyublena Could you please check if the query SELECT userid, 'constant val' as extra, cnt from (SELECT userid, AS extra, COUNT(1) from T GROUP BY 1) s in the commit message is correct? Did you mean this?

SELECT userid, 'constant val' as extra, cnt from (SELECT userid,  COUNT(1) as cnt from t GROUP BY 1) s;

mlyublena · 2022-11-04T18:25:50Z

...hmark/src/main/java/com/facebook/presto/benchmark/SqlPullConstantsAboveGroupByBenchmark.java

Added a benchmark test @kaikalur:

INFO: Without optimization Nov 04, 2022 11:13:36 AM com.facebook.airlift.log.Logger info INFO: -- Loading system access control -- Nov 04, 2022 11:13:36 AM com.facebook.airlift.log.Logger info INFO: -- Loaded system access control allow-all -- Nov 04, 2022 11:13:36 AM com.facebook.airlift.log.Logger info INFO: -- Loading temp storage local -- Nov 04, 2022 11:13:36 AM com.facebook.airlift.log.Logger info INFO: -- Loaded temp storage local -- Nov 04, 2022 11:13:36 AM com.facebook.airlift.log.Logger info INFO: -- Loading temp storage local -- Nov 04, 2022 11:13:36 AM com.facebook.airlift.log.Logger info INFO: -- Loaded temp storage local -- peak_memory:1049052,elapsed_millis:71,input_rows_per_second:352,output_rows_per_second:70,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:70884750,cpu_nanos:63690000,user_nanos:59689000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:88,input_rows_per_second:282,output_rows_per_second:56,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:88427792,cpu_nanos:82240000,user_nanos:76153000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:73,input_rows_per_second:342,output_rows_per_second:68,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:73053500,cpu_nanos:66569000,user_nanos:61794000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:90,input_rows_per_second:277,output_rows_per_second:55,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:89986583,cpu_nanos:83379000,user_nanos:76933000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:81,input_rows_per_second:307,output_rows_per_second:61,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:81414083,cpu_nanos:72700000,user_nanos:68129000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:75,input_rows_per_second:335,output_rows_per_second:67,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:74596792,cpu_nanos:70166000,user_nanos:65303000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:73,input_rows_per_second:341,output_rows_per_second:68,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:73201583,cpu_nanos:67967000,user_nanos:62847000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:96,input_rows_per_second:261,output_rows_per_second:52,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:95575666,cpu_nanos:85599000,user_nanos:78474000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:151,input_rows_per_second:165,output_rows_per_second:33,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:151015041,cpu_nanos:135654000,user_nanos:123756000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:153,input_rows_per_second:163,output_rows_per_second:32,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:153300500,cpu_nanos:124190000,user_nanos:114321000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:150,input_rows_per_second:166,output_rows_per_second:33,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:149765583,cpu_nanos:139011000,user_nanos:127773000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:121,input_rows_per_second:206,output_rows_per_second:41,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:121312292,cpu_nanos:113491000,user_nanos:105332000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:58,input_rows_per_second:428,output_rows_per_second:85,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:58363583,cpu_nanos:53699000,user_nanos:50201000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:67,input_rows_per_second:371,output_rows_per_second:74,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:67276167,cpu_nanos:62683000,user_nanos:58266000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:59,input_rows_per_second:421,output_rows_per_second:84,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:59347209,cpu_nanos:55699000,user_nanos:51709000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:51,input_rows_per_second:493,output_rows_per_second:98,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:50684583,cpu_nanos:47907000,user_nanos:45072000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:53,input_rows_per_second:475,output_rows_per_second:95,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:52540792,cpu_nanos:48898000,user_nanos:45745000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:77,input_rows_per_second:326,output_rows_per_second:65,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:76682500,cpu_nanos:69061000,user_nanos:63892000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:57,input_rows_per_second:441,output_rows_per_second:88,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:56605834,cpu_nanos:52881000,user_nanos:49281000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1049052,elapsed_millis:54,input_rows_per_second:459,output_rows_per_second:91,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:54454666,cpu_nanos:51225000,user_nanos:47822000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 pull_constants_above_group_by :: 77.335 cpu ms :: 1MB peak memory :: in 25, 0B, 323/s, 0B/s :: out 5, 130B, 64/s, 1.64KB/s Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: With optimization Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: -- Loading system access control -- Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: -- Loaded system access control allow-all -- Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: -- Loading temp storage local -- Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: -- Loaded temp storage local -- Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: -- Loading temp storage local -- Nov 04, 2022 11:13:45 AM com.facebook.airlift.log.Logger info INFO: -- Loaded temp storage local -- peak_memory:1495616,elapsed_millis:37,input_rows_per_second:684,output_rows_per_second:136,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:36547500,cpu_nanos:35853000,user_nanos:30955000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:42,input_rows_per_second:595,output_rows_per_second:119,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:42003750,cpu_nanos:40892000,user_nanos:34889000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:59,input_rows_per_second:421,output_rows_per_second:84,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:59294625,cpu_nanos:55689000,user_nanos:47761000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:48,input_rows_per_second:522,output_rows_per_second:104,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:47834833,cpu_nanos:45860000,user_nanos:39594000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:36,input_rows_per_second:693,output_rows_per_second:138,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:36051750,cpu_nanos:35401000,user_nanos:30276000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:108,input_rows_per_second:232,output_rows_per_second:46,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:107698834,cpu_nanos:67399000,user_nanos:60120000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:89,input_rows_per_second:279,output_rows_per_second:55,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:89431750,cpu_nanos:87399000,user_nanos:82486000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:36,input_rows_per_second:702,output_rows_per_second:140,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:35595250,cpu_nanos:34275000,user_nanos:32643000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:39,input_rows_per_second:642,output_rows_per_second:128,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:38891708,cpu_nanos:37020000,user_nanos:34996000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:34,input_rows_per_second:732,output_rows_per_second:146,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:34141125,cpu_nanos:32628000,user_nanos:30786000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:38,input_rows_per_second:653,output_rows_per_second:130,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:38242459,cpu_nanos:36824000,user_nanos:35107000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:48,input_rows_per_second:520,output_rows_per_second:104,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:48046416,cpu_nanos:44795000,user_nanos:41783000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:38,input_rows_per_second:664,output_rows_per_second:132,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:37624625,cpu_nanos:36067000,user_nanos:34233000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:29,input_rows_per_second:860,output_rows_per_second:172,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:29043125,cpu_nanos:28326000,user_nanos:27263000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:53,input_rows_per_second:470,output_rows_per_second:94,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:53106041,cpu_nanos:49474000,user_nanos:46099000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:45,input_rows_per_second:553,output_rows_per_second:110,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:45162917,cpu_nanos:42568000,user_nanos:39742000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:40,input_rows_per_second:619,output_rows_per_second:123,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:40335667,cpu_nanos:36132000,user_nanos:34354000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:43,input_rows_per_second:581,output_rows_per_second:116,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:43028208,cpu_nanos:40935000,user_nanos:38190000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:30,input_rows_per_second:822,output_rows_per_second:164,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:30398000,cpu_nanos:29613000,user_nanos:28504000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 peak_memory:1495616,elapsed_millis:29,input_rows_per_second:867,output_rows_per_second:173,input_megabytes:0,input_megabytes_per_second:0,wall_nanos:28825333,cpu_nanos:28177000,user_nanos:27255000,input_rows:25,input_bytes:0,output_rows:5,output_bytes:130 pull_constants_above_group_by :: 42.266 cpu ms :: 1.43MB peak memory :: in 25, 0B, 591/s, 0B/s :: out 5, 130B, 118/s, 3KB/s

kaikalur · 2022-11-04T18:37:05Z

Please squash the commits into a single one

For example: SELECT userid, 'constant val' AS extra, COUNT(1) as cnt from T GROUP BY 1, 2 into SELECT userid, 'constant val' as extra, cnt from (SELECT userid, AS extra, COUNT(1) from T GROUP BY 1) s

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Move constant grouping keys above the group by

00b69cc

For example: SELECT userid, 'constant val' AS extra, COUNT(1) as cnt from T GROUP BY 1, 2 into SELECT userid, 'constant val' as extra, cnt from (SELECT userid, AS extra, COUNT(1) from T GROUP BY 1) s

mlyublena force-pushed the optimize-const-grouping-keys branch from 3cd42fe to 00b69cc Compare November 4, 2022 18:41

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kaikalur merged commit 6ad58d8 into prestodb:master Nov 4, 2022

wanglinsong mentioned this pull request Jan 12, 2023

Add release notes for 0.279 #18920

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mlyublena commented Apr 13, 2022

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linux-foundation-easycla bot commented Apr 13, 2022 •

edited

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kaikalur Apr 18, 2022 •

edited

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mlyublena Nov 4, 2022 •

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