zzwqqq commented on code in PR #5101:
URL: https://github.com/apache/calcite/pull/5101#discussion_r3592173153
##########
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java:
##########
@@ -2016,6 +2016,40 @@ private static String toSql(RelNode root, SqlDialect
dialect,
relFn(relFn).withOracle().ok(expectedOracle);
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-7655";>[CALCITE-7655]
+ * RelToSqlConverter incorrectly removes a subquery when grouping by a
window function
+ * result</a>. */
+ @Test void testGroupByWindowFunction() {
+ final String query = "SELECT \"EMPNO\", \"row_number\", COUNT(*) AS
\"c\"\n"
+ + "FROM (\n"
+ + " SELECT \"EMPNO\",\n"
+ + " ROW_NUMBER() OVER (ORDER BY \"EMPNO\" NULLS FIRST) AS
\"row_number\"\n"
+ + " FROM \"EMP\") AS \"t\"\n"
+ + "GROUP BY \"EMPNO\", \"row_number\"";
+
+ final String expectedMysql = "SELECT `EMPNO`, `row_number`, COUNT(*) AS
`c`\n"
Review Comment:
Yeah, I've verified them:
https://onecompiler.com/mysql/44vbzf2zh
https://onecompiler.com/oracle/44vbzehcw
https://onecompiler.com/postgresql/44vbze2j3
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