[GitHub] [calcite] jcamachor commented on a change in pull request #1858: [CALCITE-3862] Rewriting for materialized view consisting of group by on join keys with aggregate fails (Vineet Garg)

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jcamachor commented on a change in pull request #1858: [CALCITE-3862] Rewriting for materialized view consisting of group by on join keys with aggregate fails (Vineet Garg)
URL: https://github.com/apache/calcite/pull/1858#discussion_r393277299
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/rel/rules/materialize/MaterializedViewAggregateRule.java
 ##########
 @@ -673,15 +673,22 @@ protected MaterializedViewAggregateRule(RelOptRuleOperand operand,
       rewritingMapping = rewritingMappingB.build();
       final ImmutableMultimap<Integer, Integer> inverseMapping = rewritingMapping.inverse();
       final List<RexNode> projects = new ArrayList<>();
+
+      final ImmutableBitSet.Builder addedProjects = ImmutableBitSet.builder();
       for (int i = 0; i < queryAggregate.getGroupCount(); i++) {
+        int pos = groupSet.indexOf(inverseMapping.get(i).iterator().next());
+        addedProjects.set(pos);
         projects.add(
             rexBuilder.makeInputRef(result,
                 groupSet.indexOf(inverseMapping.get(i).iterator().next())));
       }
+
+      ImmutableBitSet projs = addedProjects.build();
 
 Review comment:
   `projs` -> `projectedColumns` ?

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