Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/17962#discussion_r116171180
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -442,4 +442,14 @@ object QueryPlan {
}
}.canonicalized.asInstanceOf[T]
}
+
+ /** Normalize and reorder the expressions in the given sequence. */
--- End diff --
It links predicates with `AND` and pass it to `def normalizeExprId`, in
which `Canonicalize.execute` is called. That's where we do the reordering.
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