[SPARK-32761][SQL] Allow aggregating multiple foldable distinct expressions #29607
Conversation
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
linhongliu-db
changed the title
Member
|
add to whitelist |
HyukjinKwon
approved these changes
Sep 1, 2020
|
Test build #128133 has finished for PR 29607 at commit
|
Contributor
|
thanks, merging to master! |
linhongliu-db
added a commit
to linhongliu-db/spark
that referenced
this pull request
Oct 15, 2020
…ssions ### What changes were proposed in this pull request? For queries with multiple foldable distinct columns, since they will be eliminated during execution, it's not mandatory to let `RewriteDistinctAggregates` handle this case. And in the current code, `RewriteDistinctAggregates` *dose* miss some "aggregating with multiple foldable distinct expressions" cases. For example: `select count(distinct 2), count(distinct 2, 3)` will be missed. But in the planner, this will trigger an error that "multiple distinct expressions" are not allowed. As the foldable distinct columns can be eliminated finally, we can allow this in the aggregation planner check. ### Why are the changes needed? bug fix ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? added test case Closes apache#29607 from linhongliu-db/SPARK-32761. Authored-by: Linhong Liu <[email protected]> Signed-off-by: Wenchen Fan <[email protected]> (cherry picked from commit a410658)
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
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Outdated suggestions cannot be applied.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.
What changes were proposed in this pull request?
For queries with multiple foldable distinct columns, since they will be eliminated during
execution, it's not mandatory to let
RewriteDistinctAggregateshandle this case. Andin the current code,
RewriteDistinctAggregatesdose miss some "aggregating withmultiple foldable distinct expressions" cases.
For example:
select count(distinct 2), count(distinct 2, 3)will be missed.But in the planner, this will trigger an error that "multiple distinct expressions" are not allowed.
As the foldable distinct columns can be eliminated finally, we can allow this in the aggregation
planner check.
Why are the changes needed?
bug fix
Does this PR introduce any user-facing change?
No
How was this patch tested?
added test case