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Posted to reviews@spark.apache.org by "aokolnychyi (via GitHub)" <gi...@apache.org> on 2023/04/23 19:55:16 UTC
[GitHub] [spark] aokolnychyi opened a new pull request, #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
aokolnychyi opened a new pull request, #40919:
URL: https://github.com/apache/spark/pull/40919
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### What changes were proposed in this pull request?
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This PR extends `ResolveRowLevelCommandAssignments` to also cover MERGE assignments.
### Why are the changes needed?
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Similar to SPARK-42151, these changes are needed so that we can rewrite MERGE statements into executable plans for tables that support row-level operations. In particular, our row-level mutation framework assumes Spark is responsible for building an updated version of each affected row and that row is passed back to the data source.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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This PR comes with tests.
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[GitHub] [spark] aokolnychyi commented on a diff in pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
Posted by "aokolnychyi (via GitHub)" <gi...@apache.org>.
aokolnychyi commented on code in PR #40919:
URL: https://github.com/apache/spark/pull/40919#discussion_r1174639313
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala:
##########
@@ -1818,7 +1818,10 @@ class Analyzer(override val catalogManager: CatalogManager) extends RuleExecutor
"sqlExpr" -> a.sql,
"cols" -> cols))
}
- resolved
+ resolved match {
Review Comment:
This change is needed as references to nested columns in MERGE are resolved like `a.nested_col.i AS i` (with added aliases), which breaks our assumption about what kind of keys we expect. Let me know if anyone can spot any edge cases when it is not safe.
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[GitHub] [spark] cloud-fan closed pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan closed pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
URL: https://github.com/apache/spark/pull/40919
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[GitHub] [spark] aokolnychyi commented on pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
Posted by "aokolnychyi (via GitHub)" <gi...@apache.org>.
aokolnychyi commented on PR #40919:
URL: https://github.com/apache/spark/pull/40919#issuecomment-1521940601
Thanks for reviewing, @cloud-fan!
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[GitHub] [spark] cloud-fan commented on pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on PR #40919:
URL: https://github.com/apache/spark/pull/40919#issuecomment-1521396482
thanks, merging to master!
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[GitHub] [spark] aokolnychyi commented on pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
Posted by "aokolnychyi (via GitHub)" <gi...@apache.org>.
aokolnychyi commented on PR #40919:
URL: https://github.com/apache/spark/pull/40919#issuecomment-1520498405
@cloud-fan @sunchao @viirya @huaxingao @dongjoon-hyun @gengliangwang, this is a follow-up to PR #40308.
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[GitHub] [spark] aokolnychyi commented on a diff in pull request #40919: [SPARK-43204][SQL] Align MERGE assignments with table attributes
Posted by "aokolnychyi (via GitHub)" <gi...@apache.org>.
aokolnychyi commented on code in PR #40919:
URL: https://github.com/apache/spark/pull/40919#discussion_r1174635165
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala:
##########
@@ -1818,7 +1818,10 @@ class Analyzer(override val catalogManager: CatalogManager) extends RuleExecutor
"sqlExpr" -> a.sql,
"cols" -> cols))
}
- resolved
+ resolved match {
Review Comment:
Without this change, nested references in MERGE are resolved as `t.struct_col.id AS id`, which breaks our assumption about what kind of keys we expect in assignments. It seems safe for both keys and values but let me know if there are any cases when it is not safe.
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