[SPARK-28227][SQL][FOLLOWUP] Add test case about transform with distict

sql/core/src/test/resources/sql-tests/inputs/transform.sql

@@ -311,7 +311,7 @@ SET spark.sql.legacy.parser.havingWithoutGroupByAsWhere=false;
 SET spark.sql.parser.quotedRegexColumnNames=true;
 
 SELECT TRANSFORM(`(a|b)?+.+`)
- USING 'cat' AS (c)
+  USING 'cat' AS (c)
 FROM script_trans;
 
 SET spark.sql.parser.quotedRegexColumnNames=false;
@@ -320,4 +320,9 @@ SET spark.sql.parser.quotedRegexColumnNames=false;
 WITH temp AS (
   SELECT TRANSFORM(a) USING 'cat' AS (b string) FROM t
 )
-SELECT t1.b FROM temp t1 JOIN temp t2 ON t1.b = t2.b
+SELECT t1.b FROM temp t1 JOIN temp t2 ON t1.b = t2.b;
+
+SELECT TRANSFORM(distinct b, a, c)
+  USING 'cat' AS (a, b, c)
+FROM script_trans
+WHERE a <= 4;

sql/core/src/test/resources/sql-tests/results/transform.sql.out

@@ -1,5 +1,5 @@
 -- Automatically generated by SQLQueryTestSuite
--- Number of queries: 42
+-- Number of queries: 43
 
 
 -- !query
@@ -610,7 +610,7 @@ spark.sql.parser.quotedRegexColumnNames	true
 
 -- !query
 SELECT TRANSFORM(`(a|b)?+.+`)
- USING 'cat' AS (c)
+  USING 'cat' AS (c)
 FROM script_trans
 -- !query schema
 struct<c:string>
@@ -627,6 +627,7 @@ struct<key:string,value:string>
 -- !query output
 spark.sql.parser.quotedRegexColumnNames	false
 
+
 -- !query
 WITH temp AS (
   SELECT TRANSFORM(a) USING 'cat' AS (b string) FROM t
@@ -638,3 +639,15 @@ struct<b:string>
 1
 2
 3
+
+
+-- !query
+SELECT TRANSFORM(distinct b, a, c)
+  USING 'cat' AS (a, b, c)
+FROM script_trans
+WHERE a <= 4
+-- !query schema
+struct<>
+-- !query output
+org.apache.spark.sql.AnalysisException
+cannot resolve 'distinct' given input columns: [script_trans.a, script_trans.b, script_trans.c]; line 1 pos 17