maropu commented on a change in pull request #29087:
URL: https://github.com/apache/spark/pull/29087#discussion_r551321874
##########
File path: sql/core/src/test/resources/sql-tests/inputs/transform.sql
##########
@@ -183,3 +189,84 @@ SELECT a, b, decode(c, 'UTF-8'), d, e, f, g, h, i, j, k, l
FROM (
NULL DEFINED AS 'NULL'
FROM t
) tmp;
+
+SELECT TRANSFORM (b, a, CAST(c AS STRING) )
+USING 'cat' AS (a, b, c)
+FROM script_trans
+WHERE a <= 4;
+
+SELECT TRANSFORM (1,2,3)
+USING 'cat' AS (a, b, c)
+FROM script_trans
+WHERE a <= 4;
+
+SELECT TRANSFORM(1,2)
+USING 'cat' AS (a INT,b INT)
+FROM script_trans
+LIMIT 1;
+
+SELECT TRANSFORM (
+b AS d5, a,
+CASE
+ WHEN c > 100 THEN 1
+ WHEN c < 100 THEN 2
+ELSE 3 END)
+USING 'cat' AS (a,b,c)
+FROM script_trans
+WHERE a <= 4;
+
+SELECT TRANSFORM (b, a, c + 1 )
+USING 'cat' AS (a,b,c)
+FROM script_trans
+WHERE a <= 4;
+
+SELECT TRANSFORM (*)
+USING 'cat' AS (a,b,c)
+FROM script_trans
+WHERE a <= 4;
+
+SELECT TRANSFORM (b AS d, MAX(a) as max_a, CAST(SUM(c) AS STRING))
Review comment:
In hive, one can use an aggregate filter, e.g., `SELECT TRANSFORM (b AS
d, MAX(a) FILTER (WHER a > 3) as max_a`? Could you add tests for it?
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