fix: FilterExec should drop projection when apply projection pushdown#21460
Merged
alamb merged 5 commits intoapache:mainfrom Apr 8, 2026
Merged
fix: FilterExec should drop projection when apply projection pushdown#21460alamb merged 5 commits intoapache:mainfrom
alamb merged 5 commits intoapache:mainfrom
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alamb
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Apr 8, 2026
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Thanks @haohuaijin
the fix makes sense to me, but I think it would be better to try and add some higher level tests if possible
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Thanks @haohuaijin |
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Thanks for your quick reviews @alamb |
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Gotta love the bug fixes. THanks @haohuaijin Cna you please make a backport for this issue to |
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I agree -- it is fine that the test is not included |
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Which issue does this PR close?
Rationale for this change
When a
ProjectionExecsits on top of aFilterExecthat already carries an explicit projection, theProjectionPushdownoptimizer attempts to swap them viatry_swapping_with_projection. The swap replaces theFilterExec'sinput with the narrowerProjectionExec, butFilterExecBuilder::from(self)carried over the old projection indices (e.g. [0, 1, 2]). After the swap the new input only has the columns selected by theProjectionExec(e.g. 2 columns), so .build() tries to validate the stale projection against the narrower schema and panics with "project index 2 out of bounds, max field 2".What changes are included in this PR?
In
FilterExec::try_swapping_with_projection, after replacing the input with the narrower ProjectionExec, clear the FilterExec's own projection via .apply_projection(None). The ProjectionExec that is now the input already handles column selection, so the FilterExec no longer needs its own projection.Are these changes tested?
yes, add test case
Are there any user-facing changes?