Causality Analysis for Builtin Window Functions #9048
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Co-authored-by: Mehmet Ozan Kabak <ozankabak@gmail.com>
# Please enter a commit message to explain why this merge is necessary, # especially if it merges an updated upstream into a topic branch. # # Lines starting with '#' will be ignored, and an empty message aborts # the commit.
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Jan 29, 2024
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lgtm thanks @mustafasrepo
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Since this is a fairly simple change, I will go ahead and merge it (hence we can utilize @alamb's review cycles more effectively) |
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Which issue does this PR close?
Closes #.
Rationale for this change
In the PR8842 causality (analysis whether window frame need future values to calculate its result. Similar to signal processing terminology) support for window frame is introduced. Although most of the window functions uses window frame to determine its necessary rows. Some of the window functions do not use window frame to determine necessary rows for its result (such as
ROW_NUMBER,RANK,LEAD,LAG, etc.)This PR adds causality analysis support for these window functions. With the changes introduced in this PR, we can generate results for these window functions earlier.
What changes are included in this PR?
Are these changes tested?
Yes
Are there any user-facing changes?