Fix bug in CombineApproxPercentileFunctions with duplicate aggregation expressions #18889
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The current implementation assumes that there are no duplicate aggregation expressions, which does not hold in some cases. In this PR, I filter out these aggregations to fix the bug.
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kaikalur
approved these changes
Dec 30, 2022
rschlussel
approved these changes
Jan 3, 2023
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On second thoughts, talking to Feilong offline, I feel we should not have special cases like this, instead fix up the optimization to project out original expressions (multiple times if needed). |
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Sounds good. let's do a follow up fix, but in the meantime at least the queries will stop failing. |
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The current implementation assumes that there are no duplicate aggregation expressions, which does not hold in some cases. To solve this problem, I need to either 1) fix the code to take care of the duplicates or 2) filter these aggregations which have duplicates. Since approach 1 will complicate the code and it's not a common case, I decided to take approach 2 to filter out these aggregations to fix the bug.
Test plan - (Please fill in how you tested your changes)
Add unit tests.