Handle nested projection with derived column optimization #8951
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mustafasrepo
previously approved these changes
Jan 23, 2024
|
@gruuya after some thinking through, I think best approach is your initial suggestion in the issue. I think, the only safe condition we can remove top projection is schema having same, and all expressions are trivial. And window test changes are another issue, that this fix reveals. And we should fix them separately. I filed the PR8960 with I think safest way to proceed is that PR. What do you think? |
mustafasrepo
dismissed
their stale review
after some thinking through, we can proceed with a safer approach
Agreed, that makes sense; closing this one. |
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Which issue does this PR close?
Closes #8942.
Rationale for this change
Before discarding an outer projection that has the same output schema as the optimized inner projection, check for the equality of their expressions as well, and if these are different (e.g. having a non-trivial but aliased expression) keep the outer node.
What changes are included in this PR?
Changes to the
OptimizeProjectionslogical optimizer.Are these changes tested?
Yes, a test is added.
Are there any user-facing changes?
Fixes a regression from #8942.