kaijianding commented on a change in pull request #11379:
URL: https://github.com/apache/druid/pull/11379#discussion_r665154317
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/rel/DruidQuery.java
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@@ -1016,6 +1017,42 @@ public GroupByQuery toGroupByQuery()
grouping.getSubtotals().toSubtotalsSpec(grouping.getDimensionSpecs()),
ImmutableSortedMap.copyOf(plannerContext.getQueryContext())
);
+ // in this case, the timestampResult optimization is not neccessary
+ if (query.getLimitSpec() instanceof DefaultLimitSpec &&
query.isApplyLimitPushDown()) {
+ return query;
+ }
+ Map<String, Object> theContext = plannerContext.getQueryContext();
+
+ Granularity queryGranularity = null;
+
+ if (!grouping.getDimensions().isEmpty()) {
+ for (DimensionExpression dimensionExpression : grouping.getDimensions())
{
+ Granularity granularity = Expressions.toQueryGranularity(
+ dimensionExpression.getDruidExpression(),
+ plannerContext.getExprMacroTable()
+ );
+ if (granularity == null) {
+ continue;
+ }
+ if (queryGranularity != null) {
+ // group by more than one timestamp_floor
+ // eg: group by timestamp_floor(__time to
DAY),timestamp_floor(__time, to HOUR)
+ queryGranularity = null;
+ break;
+ }
+ queryGranularity = granularity;
+ int timestampDimensionIndexInDimensions =
grouping.getDimensions().indexOf(dimensionExpression);
+ theContext = new HashMap<>();
Review comment:
It is going to be passed to `query.withOverriddenContext(theContext)`,
so it's no need to repeat other contexts in query.getContext();
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