Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/19452#discussion_r144099476
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinHelper.scala
---
@@ -66,6 +67,60 @@ object StreamingSymmetricHashJoinHelper extends Logging {
}
}
+ /**
+ * Wrapper around various useful splits of the join condition.
+ * left AND right AND joined is equivalent to full.
+ *
+ * Note that left and right do not necessarily contain *all* conjuncts
which satisfy
+ * their condition. Any conjuncts after the first nondeterministic one
are treated as
+ * nondeterministic for purposes of the split.
+ *
+ * @param left Deterministic conjuncts which reference only the left
side of the join.
--- End diff --
conjunct which refers to only the left side
OR
conjuncts which require references from only the left side of the join
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