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Fix window function lowering for correlated subqueries#9081

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asenac merged 1 commit intoMaterializeInc:mainfrom
asenac:window-function-decorrelation
Nov 17, 2021
Merged

Fix window function lowering for correlated subqueries#9081
asenac merged 1 commit intoMaterializeInc:mainfrom
asenac:window-function-decorrelation

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@asenac
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@asenac asenac commented Nov 15, 2021

Motivation

Fixes MaterializeInc/database-issues#2760.

The reduction that computes the window function must be keyed on the columns from the outer context.

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Checklist

  • This PR has adequate test coverage / QA involvement has been duly considered.
  • This PR adds a release note for any
    user-facing behavior changes.

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Does this PR have tests for what happens if there are more than one outer context?

Comment thread src/sql/src/plan/lowering.rs
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asenac commented Nov 16, 2021

Does this PR have tests for what happens if there are more than one outer context?

It doesn't, but I think the fact that the outer context is the concatenation of all the elements from the outer query blocks the query sub-tree is correlated with is a contract in the lowering code we can rely on.

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I need to write a new RQG grammar because the one that I have only rarely produces fully-valid queries with window functions. So please give me another day.

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I am now able to readily hit the original issue and this branch fixes it. No other wrong results or panics.

The reduction must be keyed on the outer columns.
@asenac asenac force-pushed the window-function-decorrelation branch from bd0edf7 to ce3bff1 Compare November 17, 2021 13:30
@asenac asenac enabled auto-merge November 17, 2021 13:32
@asenac asenac merged commit 6dfa237 into MaterializeInc:main Nov 17, 2021
def- pushed a commit that referenced this pull request Feb 9, 2026
Bumps [pip](https://github.com/pypa/pip) from 25.3 to 26.0.1.
<details>
<summary>Changelog</summary>
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<h2>Bug Fixes</h2>
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<li>Fix <code>--pre</code> not being respected from the command line
when a requirement file
includes an option e.g. <code>-extra-index-url</code>.
(<code>[#13788](pypa/pip#13788)
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<h1>26.0 (2026-01-30)</h1>
<h2>Deprecations and Removals</h2>
<ul>
<li>Remove support for non-bare project names in egg fragments. Affected
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(<code>[#13157](pypa/pip#13157)
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<li>
<p>Display pip's command-line help in colour, if possible.
(<code>[#12134](pypa/pip#12134)
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</li>
<li>
<p>Support installing dependencies declared with inline script metadata
(:pep:<code>723</code>) with <code>--requirements-from-script</code>.
(<code>[#12891](pypa/pip#12891)
&lt;https://github.com/pypa/pip/issues/12891&gt;</code>_)</p>
</li>
<li>
<p>Add <code>--all-releases</code> and <code>--only-final</code> options
to control pre-release
and final release selection during package installation.
(<code>[#13221](pypa/pip#13221)
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<li>
<p>Add <code>--uploaded-prior-to</code> option to only consider packages
uploaded prior to
a given datetime when the <code>upload-time</code> field is available
from a remote index.
(<code>[#13625](pypa/pip#13625)
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<li>
<p>Add <code>--use-feature inprocess-build-deps</code> to request that
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and <code>--no-cache-dir</code> reliably, and supports prompting for
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<p>Enabling this feature will also enable <code>--use-feature
build-constraints</code>. This feature will
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2.0rc1</code> now installs
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<li>Precompute Python requirements on each candidate, reducing time of
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<li>Skip redundant work converting version objects to strings when using
the</li>
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<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
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windows fix tests</li>
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Bump for release</li>
<li><a
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Update AUTHORS.txt</li>
<li><a
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Merge pull request <a
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ichard26/docs/groups</li>
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