amaliujia commented on a change in pull request #2647:
URL: https://github.com/apache/calcite/pull/2647#discussion_r768945810
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File path: core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
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@@ -1077,6 +1081,48 @@ private void
checkSemiOrAntiJoinProjectTranspose(JoinRelType type) {
.check();
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-4941";>[CALCITE-4941]
+ * SemiJoinRule loses hints</a>. */
+ @Test void testSemiJoinRuleWithHint() {
+ final RelHint noHashJoinHint = RelHint.builder("no_hash_join").build();
+ final Function<RelBuilder, RelNode> relFn = b -> {
+ b.getCluster().setHintStrategies(
+ HintStrategyTable.builder()
+ .hintStrategy("no_hash_join", HintPredicates.JOIN)
+ .build());
+ return b
+ .scan("DEPT")
+ .scan("EMP")
+ .project(b.field("DEPTNO"))
+ .distinct()
+ .join(
+ JoinRelType.INNER,
+ b.equals(
+ b.field(2, 0, "DEPTNO"),
+ b.field(2, 1, "DEPTNO"))).hints(noHashJoinHint)
+ .project(b.field("DNAME"))
+ .build();
+ };
+
+ // verify plan
+ relFn(relFn)
+ .withRule(CoreRules.PROJECT_TO_SEMI_JOIN)
+ .check();
+
+ // verify hint
+ final RelBuilder relBuilder =
RelBuilder.create(RelBuilderTest.config().build());
+ final RelNode input = relFn.apply(relBuilder);
+ final HepProgram program = new HepProgramBuilder()
+ .addRuleInstance(CoreRules.PROJECT_TO_SEMI_JOIN)
+ .build();
+ final HepPlanner hepPlanner = new HepPlanner(program);
+ hepPlanner.setRoot(input);
+ final RelNode output = hepPlanner.findBestExp();
Review comment:
I didn't touch this before so out of curiosity:
Is HepPlanner deterministic that we can guarantee this test will not be
flaky?
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