[SPARK-28287][SQL][PYTHON][TESTS] Convert and port 'udaf.sql' into UDF test base

[vinodkc]

What changes were proposed in this pull request?

This PR adds some tests converted from 'udaf.sql' to test UDFs

Diff comparing to 'udaf.sql'

diff --git a/sql/core/src/test/resources/sql-tests/results/udaf.sql.out b/sql/core/src/test/resources/sql-tests/results/udf/udf-udaf.sql.out
index f4455bb717..e1747f4667 100644
--- a/sql/core/src/test/resources/sql-tests/results/udaf.sql.out
+++ b/sql/core/src/test/resources/sql-tests/results/udf/udf-udaf.sql.out
@@ -3,6 +3,8 @@


 -- !query 0
+-- This test file was converted from udaf.sql.
+
 CREATE OR REPLACE TEMPORARY VIEW t1 AS SELECT * FROM VALUES
 (1), (2), (3), (4)
 as t1(int_col1)
@@ -21,15 +23,15 @@ struct<>


 -- !query 2
-SELECT default.myDoubleAvg(int_col1) as my_avg from t1
+SELECT default.myDoubleAvg(udf(int_col1)) as my_avg, udf(default.myDoubleAvg(udf(int_col1))) as my_avg2, udf(default.myDoubleAvg(int_col1)) as my_avg3 from t1
 -- !query 2 schema
-struct<my_avg:double>
+struct<my_avg:double,my_avg2:double,my_avg3:double>
 -- !query 2 output
-102.5
+102.5  102.5   102.5


 -- !query 3
-SELECT default.myDoubleAvg(int_col1, 3) as my_avg from t1
+SELECT default.myDoubleAvg(udf(int_col1), udf(3)) as my_avg from t1
 -- !query 3 schema
 struct<>
 -- !query 3 output
@@ -46,12 +48,12 @@ struct<>


 -- !query 5
-SELECT default.udaf1(int_col1) as udaf1 from t1
+SELECT default.udaf1(udf(int_col1)) as udaf1, udf(default.udaf1(udf(int_col1))) as udaf2, udf(default.udaf1(int_col1)) as udaf3 from t1
 -- !query 5 schema
 struct<>
 -- !query 5 output
 org.apache.spark.sql.AnalysisException
-Can not load class 'test.non.existent.udaf' when registering the function 'default.udaf1', please make sure it is on the classpath; line 1 pos 7
+Can not load class 'test.non.existent.udaf' when registering the function 'default.udaf1', please make sure it is on the classpath; line 1 pos 94


 -- !query 6

How was this patch tested?

Tested as guided in SPARK-27921.

[viirya]

nit: this indent seems wrong? although the indent doesn't matter here..

[SparkQA]

Test build #107850 has finished for PR 25194 at commit d8bec80.

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

[HyukjinKwon]

Merged to master.