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gen4: Subquery dependencies update #8998

Merged
merged 5 commits into from
Oct 14, 2021
Merged

gen4: Subquery dependencies update #8998

merged 5 commits into from
Oct 14, 2021

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systay
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@systay systay commented Oct 14, 2021 •
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Description

The way our semantic analysis works was causing problems for the plan building. Two different problems are solved by this changeset:

  1. Rewriting away subqueries did not update the binding information, so even when a subquery was removed from the query, the binding information was not updated.
  2. Dependencies from inside the subquery were leaking out. A small example will help illustrate the problem:
select (select col from foo), baz from bar

The col on the inside of the subquery has a dependency on foo. This was leaking out so that the subquery expression also had a dependency to foo, when it really shouldn't.

Related Issue(s)

#7280

@systay systay added Component: Query Serving release notes Type: Enhancement Logical improvement (somewhere between a bug and feature) labels Oct 14, 2021
@systay systay changed the title Subquery deps fix gen4: Subquery dependencies update Oct 14, 2021
GuptaManan100 and others added 4 commits October 14, 2021 11:42
@GuptaManan100 @systay
added failing testcases as unit tests
897cfa7 
Signed-off-by: Manan Gupta <manan@planetscale.com>
@GuptaManan100 @systay
fixed subquery binding
3954083 
Signed-off-by: Manan Gupta <manan@planetscale.com>
@systay
clean up code and add queries to test the new dependency code
4090a69 
Signed-off-by: Andres Taylor <andres@planetscale.com>
@systay
update test assertions
c0d1609 
Signed-off-by: Andres Taylor <andres@planetscale.com>
@systay systay marked this pull request as ready for review October 14, 2021 09:42
@systay
update query to test a more interesting situation
438a96d 
Signed-off-by: Andres Taylor <andres@planetscale.com>
GuptaManan100
GuptaManan100 approved these changes Oct 14, 2021
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LGTM now! 🌀

@systay systay merged commit 180ccfb into vitessio:main Oct 14, 2021
@systay systay deleted the subquery-deps-fix branch October 14, 2021 11:32
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@GuptaManan100 GuptaManan100 GuptaManan100 approved these changes

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

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@systay @GuptaManan100