LakeShen commented on code in PR #3367:
URL: https://github.com/apache/calcite/pull/3367#discussion_r1313824184
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core/src/test/java/org/apache/calcite/test/JdbcTest.java:
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@@ -3773,6 +3774,35 @@ public void checkOrderBy(final boolean desc,
"empid=110; name=Theodore");
}
+ @Test void testExceptToDistinct() {
+ final String sql = ""
+ + "select \"empid\", \"name\" from \"hr\".\"emps\" where
\"deptno\"=10\n"
+ + "except\n"
+ + "select \"empid\", \"name\" from \"hr\".\"emps\" where
\"empid\">=150";
+ CalciteAssert.hr()
+ .query(sql)
+ .withHook(Hook.PLANNER, (Consumer<RelOptPlanner>) planner ->
+ planner.removeRule(ENUMERABLE_MINUS_RULE))
Review Comment:
> Can you elaborate on why you need to exclude this rule in the test?
Hi @asolimando ,because in CalcitePrepareImpl#createPlanner method,it uses
the VolcanoPlanner,and the MinusToDistinctRule and EnumerableMinusRule are
added in VolcanoPlanner,the final plan space is as follows:
EnumerableMinus plan cost is less than the plan which is rewrited by
MinusToDistinctRule,so I remove the EnumerableMinusRule,MinusToDistinctRule is
generally used as the RBO rule.
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