Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16337#discussion_r94718082
--- Diff:
sql/core/src/test/resources/sql-tests/results/subquery/in-subquery/in-group-by.sql.out
---
@@ -0,0 +1,357 @@
+-- Automatically generated by SQLQueryTestSuite
+-- Number of queries: 19
+
+
+-- !query 0
+create temporary view t1 as select * from values
+ ("t1a", 6S, 8, 10L, float(15.0), 20D, 20E2, timestamp '2014-04-04
01:00:00.000', date '2014-04-04'),
+ ("t1b", 8S, 16, 19L, float(17.0), 25D, 26E2, timestamp '2014-05-04
01:01:00.000', date '2014-05-04'),
+ ("t1a", 16S, 12, 21L, float(15.0), 20D, 20E2, timestamp '2014-06-04
01:02:00.001', date '2014-06-04'),
+ ("t1a", 16S, 12, 10L, float(15.0), 20D, 20E2, timestamp '2014-07-04
01:01:00.000', date '2014-07-04'),
+ ("t1c", 8S, 16, 19L, float(17.0), 25D, 26E2, timestamp '2014-05-04
01:02:00.001', date '2014-05-05'),
+ ("t1d", null, 16, 22L, float(17.0), 25D, 26E2, timestamp '2014-06-04
01:01:00.000', null),
+ ("t1d", null, 16, 19L, float(17.0), 25D, 26E2, timestamp '2014-07-04
01:02:00.001', null),
+ ("t1e", 10S, null, 25L, float(17.0), 25D, 26E2, timestamp '2014-08-04
01:01:00.000', date '2014-08-04'),
+ ("t1e", 10S, null, 19L, float(17.0), 25D, 26E2, timestamp '2014-09-04
01:02:00.001', date '2014-09-04'),
+ ("t1d", 10S, null, 12L, float(17.0), 25D, 26E2, timestamp '2015-05-04
01:01:00.000', date '2015-05-04'),
+ ("t1a", 6S, 8, 10L, float(15.0), 20D, 20E2, timestamp '2014-04-04
01:02:00.001', date '2014-04-04'),
+ ("t1e", 10S, null, 19L, float(17.0), 25D, 26E2, timestamp '2014-05-04
01:01:00.000', date '2014-05-04')
+ as t1(t1a, t1b, t1c, t1d, t1e, t1f, t1g, t1h, t1i)
+-- !query 0 schema
+struct<>
+-- !query 0 output
+
+
+
+-- !query 1
+create temporary view t2 as select * from values
+ ("t2a", 6S, 12, 14L, float(15), 20D, 20E2, timestamp '2014-04-04
01:01:00.000', date '2014-04-04'),
+ ("t1b", 10S, 12, 19L, float(17), 25D, 26E2, timestamp '2014-05-04
01:01:00.000', date '2014-05-04'),
+ ("t1b", 8S, 16, 119L, float(17), 25D, 26E2, timestamp '2015-05-04
01:01:00.000', date '2015-05-04'),
+ ("t1c", 12S, 16, 219L, float(17), 25D, 26E2, timestamp '2016-05-04
01:01:00.000', date '2016-05-04'),
+ ("t1b", null, 16, 319L, float(17), 25D, 26E2, timestamp '2017-05-04
01:01:00.000', null),
+ ("t2e", 8S, null, 419L, float(17), 25D, 26E2, timestamp '2014-06-04
01:01:00.000', date '2014-06-04'),
+ ("t1f", 19S, null, 519L, float(17), 25D, 26E2, timestamp '2014-05-04
01:01:00.000', date '2014-05-04'),
+ ("t1b", 10S, 12, 19L, float(17), 25D, 26E2, timestamp '2014-06-04
01:01:00.000', date '2014-06-04'),
+ ("t1b", 8S, 16, 19L, float(17), 25D, 26E2, timestamp '2014-07-04
01:01:00.000', date '2014-07-04'),
+ ("t1c", 12S, 16, 19L, float(17), 25D, 26E2, timestamp '2014-08-04
01:01:00.000', date '2014-08-05'),
+ ("t1e", 8S, null, 19L, float(17), 25D, 26E2, timestamp '2014-09-04
01:01:00.000', date '2014-09-04'),
+ ("t1f", 19S, null, 19L, float(17), 25D, 26E2, timestamp '2014-10-04
01:01:00.000', date '2014-10-04'),
+ ("t1b", null, 16, 19L, float(17), 25D, 26E2, timestamp '2014-05-04
01:01:00.000', null)
+ as t2(t2a, t2b, t2c, t2d, t2e, t2f, t2g, t2h, t2i)
+-- !query 1 schema
+struct<>
+-- !query 1 output
+
+
+
+-- !query 2
+create temporary view t3 as select * from values
+ ("t3a", 6S, 12, 110L, float(15), 20D, 20E2, timestamp '2014-04-04
01:02:00.000', date '2014-04-04'),
+ ("t3a", 6S, 12, 10L, float(15), 20D, 20E2, timestamp '2014-05-04
01:02:00.000', date '2014-05-04'),
+ ("t1b", 10S, 12, 219L, float(17), 25D, 26E2, timestamp '2014-05-04
01:02:00.000', date '2014-05-04'),
+ ("t1b", 10S, 12, 19L, float(17), 25D, 26E2, timestamp '2014-05-04
01:02:00.000', date '2014-05-04'),
+ ("t1b", 8S, 16, 319L, float(17), 25D, 26E2, timestamp '2014-06-04
01:02:00.000', date '2014-06-04'),
+ ("t1b", 8S, 16, 19L, float(17), 25D, 26E2, timestamp '2014-07-04
01:02:00.000', date '2014-07-04'),
+ ("t3c", 17S, 16, 519L, float(17), 25D, 26E2, timestamp '2014-08-04
01:02:00.000', date '2014-08-04'),
+ ("t3c", 17S, 16, 19L, float(17), 25D, 26E2, timestamp '2014-09-04
01:02:00.000', date '2014-09-05'),
+ ("t1b", null, 16, 419L, float(17), 25D, 26E2, timestamp '2014-10-04
01:02:00.000', null),
+ ("t1b", null, 16, 19L, float(17), 25D, 26E2, timestamp '2014-11-04
01:02:00.000', null),
+ ("t3b", 8S, null, 719L, float(17), 25D, 26E2, timestamp '2014-05-04
01:02:00.000', date '2014-05-04'),
+ ("t3b", 8S, null, 19L, float(17), 25D, 26E2, timestamp '2015-05-04
01:02:00.000', date '2015-05-04')
+ as t3(t3a, t3b, t3c, t3d, t3e, t3f, t3g, t3h, t3i)
+-- !query 2 schema
+struct<>
+-- !query 2 output
+
+
+
+-- !query 3
+SELECT t1a,
+ Avg(t1b)
+FROM t1
+WHERE t1a IN (SELECT t2a
+ FROM t2)
+GROUP BY t1a
+-- !query 3 schema
+struct<t1a:string,avg(t1b):double>
+-- !query 3 output
+t1b 8.0
+t1c 8.0
+t1e 10.0
--- End diff --
When comparing with the DB2 results, the data type of `Avg` is different.
Just for the other reviewers, [the document of DB2
](https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000758.html)
explains the behavior:
```
The data type of the result is the same as the data type of the argument
values, except that:
- The result is a large integer if the argument values are small integers.
- The result is double-precision floating point if the argument values are
single-precision floating point.
- The result is DECFLOAT(34) if the argument is DECFLOAT(n).
```
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