HeartSaVioR commented on a change in pull request #30076:
URL: https://github.com/apache/spark/pull/30076#discussion_r508188143
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/SymmetricHashJoinStateManager.scala
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@@ -99,13 +99,20 @@ class SymmetricHashJoinStateManager(
/**
* Get all the matched values for given join condition, with marking matched.
* This method is designed to mark joined rows properly without exposing
internal index of row.
+ *
+ * @param joinOnlyFirstTimeMatchedRow Only join with first-time matched row.
Review comment:
Or like `excludeRowsAlreadyMatched`. I guess we'd like to have another
method to deal with left-semi join efficiently like I commented (and in the PR
description as well).
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