mustafasrepo opened a new pull request, #8842:
URL: https://github.com/apache/arrow-datafusion/pull/8842
## Which issue does this PR close?
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## Rationale for this change
In streaming execution, window functions generate result when frame end is
smaller than batch size (This guarantees that future rows may not extend up the
current window frame). However, for causal window frame (e.g window frame that
doesn't include future rows than the current row). We can generate results even
if frame end is same with batch size.
With this support we can decrease latency for causal queries.
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## What changes are included in this PR?
This PR adds support for causality analysis for window frame to decrease
latency and memory during generating window function results.
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## Are these changes tested?
Yes
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## Are there any user-facing changes?
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