zstan commented on a change in pull request #2439:
URL: https://github.com/apache/calcite/pull/2439#discussion_r662016102
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File path:
core/src/main/java/org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.java
##########
@@ -366,12 +370,18 @@ private static RelBuilder
convertSingletonDistinct(RelBuilder relBuilder,
final int arg = bottomGroups.size() + nonDistinctAggCallProcessedSoFar;
final List<Integer> newArgs = ImmutableList.of(arg);
if (aggCall.getAggregation().getKind() == SqlKind.COUNT) {
+ RelDataTypeFactory typeFactory =
aggregate.getCluster().getTypeFactory();
+ RelDataType sumType =
typeFactory.getTypeSystem().deriveSumType(typeFactory,
+ aggCall.getType());
+ needTopCast |= !sumType.equals(aggCall.getType());
Review comment:
running new test under debug, i found aggCall.getType() == BIGINT, while
sumType == DECIMAL(19, 0) all these representation are identical as i can see,
can you explain why we rise needTopCast flag in this case? Additionally i hope
we need integration test highliting the bug, ServerTest possibly correct place
for it. wdyt ?
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