Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r158429095
--- Diff:
sql/core/src/test/resources/sql-tests/results/string-functions.sql.out ---
@@ -42,7 +42,7 @@ struct<plan:string>
== Analyzed Logical Plan ==
col: string
-Project [concat(concat(concat(cast(col1#xL as string), cast(col2#xL as
string)), cast(col3#xL as string)), cast(col4#xL as string)) AS col#x]
+Project [concat(cast(concat(cast(concat(cast(col1#xL as string),
cast(col2#xL as string)) as string), cast(col3#xL as string)) as string),
cast(col4#xL as string)) AS col#x]
--- End diff --
aha, it's bug.. I'll fix soon.
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