AngersZhuuuu commented on a change in pull request #29085:
URL: https://github.com/apache/spark/pull/29085#discussion_r458525381
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File path: sql/core/src/test/resources/sql-tests/inputs/transform.sql
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@@ -0,0 +1,72 @@
+-- Test data.
+CREATE OR REPLACE TEMPORARY VIEW t1 AS SELECT * FROM VALUES
+('1', true, unhex('537061726B2053514C'), tinyint(1), smallint(100),
array_position(array(3, 2, 1), 1), float(1.0), 1.0, Decimal(1.0),
timestamp('1997-01-02'), date('2000-04-01')),
+('2', false, unhex('537061726B2053514C'), tinyint(2), smallint(200),
array_position(array(3, 2, 1), 2), float(2.0), 2.0, Decimal(2.0),
timestamp('1997-01-02 03:04:05'), date('2000-04-02')),
+('3', true, unhex('537061726B2053514C'), tinyint(3), smallint(300),
array_position(array(3, 2, 1), 1), float(3.0), 3.0, Decimal(3.0),
timestamp('1997-02-10 17:32:01-08'), date('2000-04-03'))
+as t1(a, b, c, d, e, f, g, h, i, j, k);
+
+SELECT TRANSFORM(a)
+USING 'cat' AS (a)
+FROM t1;
+
+
+-- with non-exist command
+SELECT TRANSFORM(a)
+USING 'some_non_existent_command' AS (a)
+FROM t1;
+
+-- with non-exist file
+SELECT TRANSFORM(a)
+USING 'python some_non_existent_file' AS (a)
+FROM t1;
+
+
+-- support different data type
+SELECT a, b, decode(c, 'UTF-8'), d, e, f, g, h, i, j, k FROM (
+ SELECT TRANSFORM(a, b, c, d, e, f, g, h, i, j, k)
+ USING 'cat' AS (
+ a string,
+ b boolean,
+ c binary,
+ d tinyint,
+ e smallint,
+ f long,
+ g float,
+ h double,
+ i decimal(38, 18),
+ j timestamp,
+ k date)
+ FROM t1
+) tmp;
+
+
+-- handle schema less
+SELECT TRANSFORM(a, b)
+USING 'cat'
+FROM t1;
+
+-- return null when return string incompatible (no serde)
+SELECT TRANSFORM(a, b, c)
+USING 'cat' as (a int, b int , c int)
+FROM (
+ SELECT
Review comment:
> We need the subquery for this test?
personal habit， removed.
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