Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r157937149
--- Diff:
sql/core/src/test/resources/sql-tests/inputs/typeCoercion/native/concat.sql ---
@@ -0,0 +1,21 @@
+-- Concatenate binary inputs
+SELECT (col1 || col2 || col3 || col4) col
+FROM (
+ SELECT
+ encode(string(id), 'utf-8') col1,
+ encode(string(id + 1), 'utf-8') col2,
+ encode(string(id + 2), 'utf-8') col3,
+ encode(string(id + 3), 'utf-8') col4
+ FROM range(10)
+);
+
+-- Concatenate mixed inputs between strings and binary
+SELECT (col1 || col2 || col3 || col4) col
+FROM (
+ SELECT
+ string(id) col1,
+ string(id + 1) col2,
+ encode(string(id + 2), 'utf-8') col3,
+ encode(string(id + 3), 'utf-8') col4
+ FROM range(10)
+);
--- End diff --
ok
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