Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/17758#discussion_r126074238
--- Diff: sql/core/src/test/resources/sql-tests/inputs/create.sql ---
@@ -0,0 +1,23 @@
+-- Catch case-sensitive name duplication
+SET spark.sql.caseSensitive=true;
+
+CREATE TABLE t(c0 STRING, c1 INT, c1 DOUBLE, c0 INT) USING parquet;
--- End diff --
In `DDLSuite`, we already have simple tests for duplicate columns. we
better moving these tests there?
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