Fix window function lowering for correlated subqueries#9081
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asenac merged 1 commit intoMaterializeInc:mainfrom Nov 17, 2021
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Fix window function lowering for correlated subqueries#9081asenac merged 1 commit intoMaterializeInc:mainfrom
asenac merged 1 commit intoMaterializeInc:mainfrom
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madelynnblue
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Nov 15, 2021
wangandi
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Does this PR have tests for what happens if there are more than one outer context?
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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. |
wangandi
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Nov 16, 2021
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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. |
philip-stoev
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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.
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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
user-facing behavior changes.