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https://issues.apache.org/jira/browse/KYLIN-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17310223#comment-17310223
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ASF GitHub Bot commented on KYLIN-4936:
---------------------------------------
zhengshengjun commented on a change in pull request #1619:
URL: https://github.com/apache/kylin/pull/1619#discussion_r602889485
##########
File path:
kylin-spark-project/kylin-spark-query/src/main/scala/org/apache/kylin/query/runtime/plans/AggregatePlan.scala
##########
@@ -53,10 +53,32 @@ object AggregatePlan extends LogEx {
.map(groupId => col(schemaNames.apply(groupId)))
.toList
- if (rel.getContext != null && rel.getContext.isExactlyAggregate) {
+ rel.getContext.isExactlyAggregate = isExactlyCuboidMatched(rel, groupList)
+ if (rel.getContext.isExactlyAggregate) {
// exactly match, skip agg, direct project.
- val aggCols = rel.getRewriteAggCalls.asScala
- .map(call => col(schemaNames.apply(call.getArgList.get(0)))).toList
+ val hash = System.identityHashCode(rel).toString
+ val aggCols = rel.getRewriteAggCalls.asScala.zipWithIndex.map {
+ case (call: KylinAggregateCall, index: Int)
+ if OLAPAggregateRel.getAggrFuncName(call).equals("COUNT_DISTINCT") =>
+ val dataType = call.getFunc.getReturnDataType
+ val funcName = OLAPAggregateRel.getAggrFuncName(call)
+ val argNames =
call.getArgList.asScala.map(dataFrame.schema.names.apply(_))
+ val columnName = argNames.map(col)
+ val aggName = SchemaProcessor.replaceToAggravateSchemaName(index,
funcName, hash, argNames: _*)
+ if (dataType.getName == "hllc") {
Review comment:
What about adding a 'isHLLCountDistinct' method in FunctionDesc,
sometimes I have trouble judging whether this count_distinct function is HLL or
precise count distinct ==
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> Exactly aggregation can't transform to project
> ----------------------------------------------
>
> Key: KYLIN-4936
> URL: https://issues.apache.org/jira/browse/KYLIN-4936
> Project: Kylin
> Issue Type: Improvement
> Components: Query Engine
> Affects Versions: v4.0.0-beta
> Reporter: ShengJun Zheng
> Assignee: Zhichao Zhang
> Priority: Major
> Fix For: v4.0.0-GA
>
>
> Exactly Aggregate can't transform to project, causing unnecessary spark
> shuffle !
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