[feat](nereids)Compress materialize for group by - #41983
Closed
englefly wants to merge 7 commits into
Closed
Conversation
|
Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
englefly
marked this pull request as draft
October 16, 2024 12:42
englefly
marked this pull request as ready for review
October 17, 2024 10:44
Contributor
Author
|
run buildall |
TPC-H: Total hot run time: 41596 ms |
Contributor
Author
|
run buildall |
TPC-H: Total hot run time: 42218 ms |
This file contains hidden or 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
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Proposed changes
Aggregation on int column is more efficient than aggregation on string column. And hence this optimization is to
convert
'select A from T group by A'
to
'select any_value(A) from T group by encode_as_int(A)' ,
where A is a string column.
there are some limitations:
example:
select *
from
(select substring(A, 1, 3) as X from T group by substring(A, 1, 3)) T1 join T on T1.X=T.A
when we rewrite aggregate node, it is hard to update the expression "T1.X=T.A" in join node.
Issue Number: close #xxx