Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r157935707
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -635,6 +635,11 @@ object SimplifyCaseConversionExpressions extends
Rule[LogicalPlan] {
/**
* Combine nested [[Concat]] expressions.
+ *
+ * If `spark.sql.expression.concat.binaryMode.enabled` is true and all
inputs are binary,
--- End diff --
also update this.
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