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expression rewriting: enable more rewrites and limit CNF rewrites #14560

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merged 4 commits into from
Nov 22, 2023
Merged

expression rewriting: enable more rewrites and limit CNF rewrites #14560

merged 4 commits into from
Nov 22, 2023

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systay
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@systay systay commented Nov 21, 2023

Description

When we can't find a good vindex to use, we try rewriting the WHERE clause into CNF (conjuctive normal form), and this transformation can in the worst case become an exponentially large expression. To stop this from happening, we count the number of OR expression we are dealing to stop the worst case from happening.

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  • "Backport to:" labels have been added if this change should be back-ported
  • Tests were added or are not required
  • Did the new or modified tests pass consistently locally and on the CI
  • Documentation was added or is not required

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vitess-bot bot commented Nov 21, 2023

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Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

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@vitess-bot vitess-bot bot added NeedsDescriptionUpdate The description is not clear or comprehensive enough, and needs work NeedsIssue A linked issue is missing for this Pull Request NeedsWebsiteDocsUpdate What it says labels Nov 21, 2023
@github-actions github-actions bot added this to the v19.0.0 milestone Nov 21, 2023
@systay systay removed NeedsDescriptionUpdate The description is not clear or comprehensive enough, and needs work NeedsWebsiteDocsUpdate What it says NeedsIssue A linked issue is missing for this Pull Request labels Nov 21, 2023
frouioui
frouioui previously approved these changes Nov 21, 2023
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Tests are failing, otherwise looks good to me.

@frouioui
Fix test TestRewritePredicate
8373442 
Signed-off-by: Florent Poinsard <[email protected]>
@frouioui
update filter_cases.json
c443ce1 
Signed-off-by: Florent Poinsard <[email protected]>
@frouioui frouioui dismissed their stale review November 21, 2023 22:33

Something is off in the rewritten queries.

frouioui
frouioui reviewed Nov 21, 2023
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go/vt/vtgate/planbuilder/testdata/filter_cases.json
@@ -4110,7 +4110,7 @@
"Sharded": true
},
"FieldQuery": "select id from `user` where 1 != 1",
"Query": "select id from `user` where id = 5 and `name` = 'foo' or id = 12 and `name` = 'bar'",
"Query": "select id from `user` where id in ::__vals and (id = 5 or `name` = 'bar') and (`name` = 'foo' or id = 12) and `name` in ('foo', 'bar')",
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Sorry i had a doubt about this re-written query but turns out it looks good to me!

@frouioui
fix TestSelectINFromOR
4359717 
Signed-off-by: Florent Poinsard <[email protected]>
@frouioui frouioui merged commit ae8d61e into vitessio:main Nov 22, 2023
115 checks passed
@frouioui frouioui deleted the cnf-limit branch November 22, 2023 00:55
@vitess-bot vitess-bot bot mentioned this pull request Nov 22, 2023
Merged
vitess-bot pushed a commit that referenced this pull request Nov 22, 2023
@vitess-bot @frouioui
expression rewriting: enable more rewrites and limit CNF rewrites (#1…
8bc62b5 
…4560)

Co-authored-by: Florent Poinsard <[email protected]>
@vitess-bot vitess-bot bot mentioned this pull request Nov 22, 2023
Merged
vitess-bot pushed a commit that referenced this pull request Nov 22, 2023
@vitess-bot @frouioui
expression rewriting: enable more rewrites and limit CNF rewrites (#1…
07f76df 
…4560)

Co-authored-by: Florent Poinsard <[email protected]>
@vitess-bot vitess-bot bot mentioned this pull request Nov 22, 2023
Merged
vitess-bot pushed a commit that referenced this pull request Nov 22, 2023
@vitess-bot @frouioui
expression rewriting: enable more rewrites and limit CNF rewrites (#1…
02e3968 
…4560)

Co-authored-by: Florent Poinsard <[email protected]>
frouioui added a commit that referenced this pull request Nov 22, 2023
@vitess-bot @frouioui
[release-18.0] expression rewriting: enable more rewrites and limit C…
e93ca44 
…NF rewrites (#14560) (#14576)

Co-authored-by: vitess-bot[bot] <108069721+vitess-bot[bot]@users.noreply.github.com>
Co-authored-by: Florent Poinsard <[email protected]>
frouioui added a commit that referenced this pull request Nov 22, 2023
@vitess-bot @frouioui
[release-17.0] expression rewriting: enable more rewrites and limit C…
94e85d9 
…NF rewrites (#14560) (#14575)

Co-authored-by: vitess-bot[bot] <108069721+vitess-bot[bot]@users.noreply.github.com>
Co-authored-by: Florent Poinsard <[email protected]>
frouioui added a commit that referenced this pull request Nov 22, 2023
@vitess-bot @frouioui
[release-16.0] expression rewriting: enable more rewrites and limit C…
53dfd30 
…NF rewrites (#14560) (#14574)

Co-authored-by: vitess-bot[bot] <108069721+vitess-bot[bot]@users.noreply.github.com>
Co-authored-by: Florent Poinsard <[email protected]>
This was referenced Nov 22, 2023
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ejortegau pushed a commit to slackhq/vitess that referenced this pull request Dec 13, 2023
@systay @frouioui @ejortegau
expression rewriting: enable more rewrites and limit CNF rewrites (vi…
f89ade4 
…tessio#14560)

Co-authored-by: Florent Poinsard <[email protected]>
@hmaurer hmaurer mentioned this pull request Mar 21, 2024
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@frouioui frouioui frouioui approved these changes

@arthurschreiber arthurschreiber arthurschreiber approved these changes

@harshit-gangal harshit-gangal Awaiting requested review from harshit-gangal harshit-gangal is a code owner

@GuptaManan100 GuptaManan100 Awaiting requested review from GuptaManan100 GuptaManan100 is a code owner

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