Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18761#discussion_r130216023
--- Diff:
sql/core/src/test/resources/sql-tests/inputs/sql-compatibility-functions.sql ---
@@ -23,3 +23,9 @@ SELECT float(1), double(1), decimal(1);
SELECT date("2014-04-04"), timestamp(date("2014-04-04"));
-- error handling: only one argument
SELECT string(1, 2);
+
+-- SPARK-21555: RuntimeReplaceable used in group by
+CREATE TABLE test(a INT, foo STRUCT<foo1:STRING,foo2:STRING>) USING
parquet;
+INSERT INTO test VALUES(1, ("value1", "value2"));
+SELECT nvl(foo.foo1, "value"), count(*) FROM test GROUP BY nvl(foo.foo1,
"value");
+DROP TABLE test;
--- End diff --
You can simplify the test case to something like
```SQL
CREATE TEMPORARY VIEW tempView1 AS VALUES (1, NAMED_STRUCT('col1', 'gamma',
'col2', 'delta')) AS T(id, st)")
SELECT nvl(st.col1, "value"), count(*) FROM from tempView1 GROUP BY
nvl(st.col1, "value")
```
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