jihoonson commented on a change in pull request #11379:
URL: https://github.com/apache/druid/pull/11379#discussion_r662743259
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/rel/DruidQuery.java
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@@ -977,6 +977,33 @@ public GroupByQuery toGroupByQuery()
// Cannot handle zero or negative limits.
return null;
}
+ 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)
+ theContext = plannerContext.getQueryContext();
+ break;
+ }
+ queryGranularity = granularity;
+ int timestampDimensionIndexInDimensions =
grouping.getDimensions().indexOf(dimensionExpression);
+ theContext = new HashMap<>(plannerContext.getQueryContext());
+ theContext.put(GroupByQuery.CTX_TIMESTAMP_RESULT_FIELD,
dimensionExpression.getOutputName());
+ theContext.put(GroupByQuery.CTX_TIMESTAMP_RESULT_FIELD_GRANULARITY,
queryGranularity);
Review comment:
The Druid native query is the execution plan of the sql query. To me, it
makes more sense to compute the granularity and dimensions and set them in the
groupBy query in the sql planner, because the query engine should process
whatever the given query plan as it is. This way, we can have one single place
that optimizes the query plan which is easier to maintain and improve. Suppose
we have multiple different places that modify the given query separately. It
will be very hard to understand what query will be actually executed.
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