[GitHub] [calcite] rubenada commented on a change in pull request #2647: [CALCITE-4941] SemiJoinRule loses hints

[GitBox <gi...@apache.org>]

rubenada commented on a change in pull request #2647:
URL: https://github.com/apache/calcite/pull/2647#discussion_r768998784



##########
File path: core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
##########
@@ -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:
       Yes, it is deterministic. HepPlanner applies its rule(s) systematically until no rule can be fired.
   In this particular test it will simply apply {{CoreRules.PROJECT_TO_SEMI_JOIN}}.




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