Optimize first_value and last_value functions with IGNORE NULLS #22092
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Record recently seen non null or null positions, and use them when processing new frames. Should speed up queries with regular framing like ROWS BETWEEN 100 PRECEDING AND 100 FOLLOWING, ROWS CURRENT ROW, or RANGE UNBOUNDED PRECEDING UNBOUNDED FOLLOWING, and with non-null values being sparse or none.
kasiafi
force-pushed
the
516_FirstLastValue
branch
from
cd6a02b
to
9999404
Compare
findepi
approved these changes
May 23, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Record recently seen non null or null positions,
and use them when processing new frames.
Should speed up queries with regular framing like
ROWS BETWEEN 100 PRECEDING AND 100 FOLLOWING,
ROWS CURRENT ROW,
or RANGE UNBOUNDED PRECEDING UNBOUNDED FOLLOWING,
and with non-null values being sparse or none.