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opt: allow apply-joins to be reordered#53355

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opt: allow apply-joins to be reordered#53355
DrewKimball wants to merge 1 commit intocockroachdb:masterfrom
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@DrewKimball
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This PR adds support to JoinOrderBuilder for the dependent variants of
inner-joins, left-joins, semi-joins and anti-joins.

This PR adds support to JoinOrderBuilder for the dependent variants of
inner-joins, left-joins, semi-joins and anti-joins.
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@DrewKimball
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Most likely, any query that would benefit from apply-join reordering should simply be decorrelated. However, I will leave this work-in-progress up in case a motivating use case is found in the future.

@tbg tbg added the X-noremind Bots won't notify about PRs with X-noremind label May 6, 2021
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