kaijianding commented on a change in pull request #11379:
URL: https://github.com/apache/druid/pull/11379#discussion_r665010174
##########
File path:
processing/src/main/java/org/apache/druid/query/groupby/strategy/GroupByStrategyV2.java
##########
@@ -213,7 +216,48 @@ public boolean doMergeResults(final GroupByQuery query)
context.put("finalize", false);
context.put(GroupByQueryConfig.CTX_KEY_STRATEGY,
GroupByStrategySelector.STRATEGY_V2);
context.put(CTX_KEY_OUTERMOST, false);
- if (query.getUniversalTimestamp() != null) {
+ Map<String, Object> timestampFieldContext =
GroupByQueryHelper.findTimestampResultField(query);
+ context.putAll(timestampFieldContext);
+
+ Granularity granularity = query.getGranularity();
+ List<DimensionSpec> dimensionSpecs = query.getDimensions();
+ final String timestampResultField = (String)
timestampFieldContext.get(GroupByQuery.CTX_TIMESTAMP_RESULT_FIELD);
+ final boolean hasTimestampResultField = timestampResultField != null
+ &&
query.getContextBoolean(CTX_KEY_OUTERMOST, true);
+ int timestampResultFieldIndex = 0;
+ if (hasTimestampResultField) {
+ // sql like "group by city_id,time_floor(__time to day)",
+ // the original translated query is granularity=all and dimensions:[d0,
d1]
+ // the better plan is granularity=day and dimensions:[d0]
+ // but the ResultRow structure is changed from [d0, d1] to [__time, d0]
+ // this structure should be fixed as [d0, d1] (actually it is [d0,
__time]) before postAggs are called
+ final Granularity timestampResultFieldGranularity
+ = (Granularity)
timestampFieldContext.get(GroupByQuery.CTX_TIMESTAMP_RESULT_FIELD_GRANULARITY);
+ dimensionSpecs =
+ query.getDimensions()
+ .stream()
+ .filter(dimensionSpec ->
!dimensionSpec.getOutputName().equals(timestampResultField))
+ .collect(Collectors.toList());
+ granularity = timestampResultFieldGranularity;
+ // when timestampResultField is the last dimension, should set
sortByDimsFirst=true,
+ // otherwise the downstream is sorted by row's timestamp first which
makes the final ordering not as expected
+ timestampResultFieldIndex = (int)
timestampFieldContext.get(GroupByQuery.CTX_TIMESTAMP_RESULT_FIELD_INDEX);
+ if (!query.getContextSortByDimsFirst() && timestampResultFieldIndex ==
query.getDimensions().size() - 1) {
+ context.put(GroupByQuery.CTX_KEY_SORT_BY_DIMS_FIRST, true);
+ }
+ // when timestampResultField is the first dimension and
sortByDimsFirst=true,
+ // it is actually equals to sortByDimsFirst=false
+ if (query.getContextSortByDimsFirst() && timestampResultFieldIndex == 0)
{
+ context.put(GroupByQuery.CTX_KEY_SORT_BY_DIMS_FIRST, false);
+ }
+ // when hasTimestampResultField=true and timestampResultField is neither
first nor last dimension,
+ // the DefaultLimitSpec will always do the reordering
+ }
Review comment:
@jihoonson code is ready, please continue review
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