[SPARK-28285][SQL][PYTHON][TESTS] Convert and port 'outer-join.sql' into UDF test base

[huaxingao]

What changes were proposed in this pull request?

This PR adds some tests converted from outer-join.sql to test UDFs. Please see contribution guide of this umbrella ticket - SPARK-27921.

Diff comparing to 'outer-join.sql'

diff --git a/sql/core/src/test/resources/sql-tests/results/outer-join.sql.out b/sql/core/src/test/resources/sql-tests/results/udf/udf-outer-join.sql.out
index 5db3bae5d0..819f786070 100644
--- a/sql/core/src/test/resources/sql-tests/results/outer-join.sql.out
+++ b/sql/core/src/test/resources/sql-tests/results/udf/udf-outer-join.sql.out
@@ -24,17 +24,17 @@ struct<>
 
 -- !query 2
 SELECT
-  (SUM(COALESCE(t1.int_col1, t2.int_col0))),
-     ((COALESCE(t1.int_col1, t2.int_col0)) * 2)
+  (udf(SUM(udf(COALESCE(t1.int_col1, t2.int_col0))))),
+     (udf(COALESCE(t1.int_col1, t2.int_col0)) * 2)
 FROM t1
 RIGHT JOIN t2
-  ON (t2.int_col0) = (t1.int_col1)
-GROUP BY GREATEST(COALESCE(t2.int_col1, 109), COALESCE(t1.int_col1, -449)),
+  ON udf(t2.int_col0) = udf(t1.int_col1)
+GROUP BY udf(GREATEST(COALESCE(udf(t2.int_col1), 109), COALESCE(t1.int_col1, udf(-449)))),
          COALESCE(t1.int_col1, t2.int_col0)
-HAVING (SUM(COALESCE(t1.int_col1, t2.int_col0)))
-            > ((COALESCE(t1.int_col1, t2.int_col0)) * 2)
+HAVING (udf(SUM(COALESCE(udf(t1.int_col1), udf(t2.int_col0)))))
+            > (udf(COALESCE(t1.int_col1, t2.int_col0)) * 2)
 -- !query 2 schema
-struct<sum(coalesce(int_col1, int_col0)):bigint,(coalesce(int_col1, int_col0) * 2):int>
+struct<CAST(udf(cast(sum(cast(cast(udf(cast(coalesce(int_col1, int_col0) as string)) as int) as bigint)) as string)) AS BIGINT):bigint,(CAST(udf(cast(coalesce(int_col1, int_col0) as string)) AS INT) * 2):int>
 -- !query 2 output
 -367   -734
 -507   -1014
@@ -70,10 +70,10 @@ spark.sql.crossJoin.enabled true
 SELECT *
 FROM (
 SELECT
-    COALESCE(t2.int_col1, t1.int_col1) AS int_col
+    udf(COALESCE(udf(t2.int_col1), udf(t1.int_col1))) AS int_col
     FROM t1
     LEFT JOIN t2 ON false
-) t where (t.int_col) is not null
+) t where (udf(t.int_col)) is not null
 -- !query 6 schema
 struct<int_col:int>
 -- !query 6 output

How was this patch tested?

Tested as guided in SPARK-27921.

[SparkQA]

Test build #107493 has finished for PR 25103 at commit 91d6955.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #107801 has finished for PR 25103 at commit 5955d46.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

retest this please

[HyukjinKwon]

Looks good to me in general if the tests pass

[SparkQA]

Test build #107816 has finished for PR 25103 at commit 5955d46.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[huaxingao]

retest this please

[SparkQA]

Test build #107861 has finished for PR 25103 at commit 5955d46.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

@huaxingao, can you update the diff comparing to the original file? Looks a bit weird.

[huaxingao]

diff updated. @HyukjinKwon

[HyukjinKwon]

Merged to master.

[huaxingao]

Thanks a lot for your help! @HyukjinKwon