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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/10/14 16:06:55 UTC
[GitHub] [spark] allisonwang-db opened a new pull request, #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
allisonwang-db opened a new pull request, #38260:
URL: https://github.com/apache/spark/pull/38260
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### What changes were proposed in this pull request?
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This PR modifies the optimizer rule `OptimizeOneRowRelationSubquery` to always collapse projects and inline non-volatile expressions.
### Why are the changes needed?
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SPARK-39699 made `CollpaseProjects` more conservative. This has impacted correlated subqueries that Spark used to be able to support. For example, Spark used to be able to execute this correlated subquery:
```sql
SELECT (
SELECT array_sort(a, (i, j) -> rank[i] - rank[j]) AS sorted
FROM (SELECT MAP('a', 1, 'b', 2) rank)
) FROM t1
```
But after SPARK-39699, it will throw an exception `Unexpected operator Join Inner` because the projects inside the subquery can no longer be collapsed. We should always inline expressions if possible to support a broader range of correlated subqueries and avoid adding expensive domain joins.
### Does this PR introduce _any_ user-facing change?
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Yes. It will allow Spark to execute more types of correlated subqueries.
### How was this patch tested?
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Unit test.
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[GitHub] [spark] cloud-fan commented on pull request #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on PR #38260:
URL: https://github.com/apache/spark/pull/38260#issuecomment-1284909191
The test failure seems unrelated, can you retrigger?
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[GitHub] [spark] allisonwang-db commented on pull request #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
Posted by GitBox <gi...@apache.org>.
allisonwang-db commented on PR #38260:
URL: https://github.com/apache/spark/pull/38260#issuecomment-1284890062
cc @cloud-fan
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[GitHub] [spark] cloud-fan commented on pull request #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on PR #38260:
URL: https://github.com/apache/spark/pull/38260#issuecomment-1288355575
thanks, merging to master!
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[GitHub] [spark] LuciferYang commented on pull request #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
Posted by GitBox <gi...@apache.org>.
LuciferYang commented on PR #38260:
URL: https://github.com/apache/spark/pull/38260#issuecomment-1286378506
@allisonwang-db You can rebase the code. I ping the Java version to 8u345 at https://github.com/apache/spark/pull/38311 for workaround and GA can pass without waiting for https://github.com/apache/spark/pull/38317
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[GitHub] [spark] cloud-fan closed pull request #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
Posted by GitBox <gi...@apache.org>.
cloud-fan closed pull request #38260: [SPARK-40800][SQL] Always inline expressions in OptimizeOneRowRelationSubquery
URL: https://github.com/apache/spark/pull/38260
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