Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r117586530
--- Diff:
sql/core/src/test/resources/sql-tests/inputs/query_regex_column.sql ---
@@ -0,0 +1,24 @@
+CREATE OR REPLACE TEMPORARY VIEW testData AS SELECT * FROM VALUES
+(1, "1"), (2, "2"), (3, "3"), (4, "4"), (5, "5"), (6, "6")
+AS testData(key, value);
+
+CREATE OR REPLACE TEMPORARY VIEW testData2 AS SELECT * FROM VALUES
+(1, 1), (1, 2), (2, 1), (2, 2), (3, 1), (3, 2)
+AS testData2(a, b);
+
+-- AnalysisException
+SELECT `(a)?+.+` FROM testData2 WHERE a = 1;
+
+-- AnalysisException
+SELECT t.`(a)?+.+` FROM testData2 t WHERE a = 1;
+
+set spark.sql.parser.quotedRegexColumnNames=true;
+
+-- Regex columns
+SELECT `(a)?+.+` FROM testData2 WHERE a = 1;
+SELECT t.`(a)?+.+` FROM testData2 t WHERE a = 1;
+SELECT p.`(key)?+.+`, b, testdata2.`(b)?+.+` FROM testData p join
testData2 ON p.key = testData2.a WHERE key < 3;
+
+-- Clean-up
+DROP VIEW IF EXISTS testData;
+DROP VIEW IF EXISTS testData2;
--- End diff --
No need to drop the temp views.
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