[GitHub] [calcite] jinxing64 commented on a change in pull request #1526: [CALCITE-3439] Support Intersect and Minus in RelMdPredicates

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

jinxing64 commented on a change in pull request #1526: [CALCITE-3439] Support Intersect and Minus in RelMdPredicates
URL: https://github.com/apache/calcite/pull/1526#discussion_r338033402
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/rel/metadata/RelMdPredicates.java
 ##########
 @@ -410,6 +414,50 @@ public RelOptPredicateList getPredicates(Union union, RelMetadataQuery mq) {
     return RelOptPredicateList.of(rexBuilder, predicates);
   }
 
+  /**
+   * Infers predicates for a Intersect.
+   */
+  public RelOptPredicateList getPredicates(Intersect intersect, RelMetadataQuery mq) {
+    final RexBuilder rexBuilder = intersect.getCluster().getRexBuilder();
+
+    final RexExecutorImpl rexImpl =
+        (RexExecutorImpl) (intersect.getCluster().getPlanner().getExecutor());
+    final RexImplicationChecker rexImplicationChecker =
+        new RexImplicationChecker(
+            intersect.getCluster().getRexBuilder(), rexImpl, intersect.getRowType());
+
+    Set<RexNode> finalPredicates = new HashSet<>();
+    RexNode composedFinalPredicates = null;
+    for (Ord<RelNode> input : Ord.zip(intersect.getInputs())) {
+      RelOptPredicateList info = mq.getPulledUpPredicates(input.e);
+      if (info.pulledUpPredicates.isEmpty()) {
+        return RelOptPredicateList.EMPTY;
+      }
+      final Set<RexNode> predicates = new HashSet<>();
+      for (RexNode pred : info.pulledUpPredicates) {
+        if (input.i == 0) {
+          predicates.add(pred);
+          continue;
+        } else if (rexImplicationChecker.implies(composedFinalPredicates, pred)) {
+          predicates.add(pred);
+        }
+      }
+      finalPredicates = predicates;
+      composedFinalPredicates = RexUtil.composeConjunction(
+          rexBuilder, finalPredicates);
+    }
+
+    return RelOptPredicateList.of(rexBuilder, finalPredicates);
+  }
+
+  /**
+   * Infers predicates for a Intersect.
 
 Review comment:
   sure

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