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https://issues.apache.org/jira/browse/FLINK-8689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16449238#comment-16449238
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ASF GitHub Bot commented on FLINK-8689:
---------------------------------------
Github user walterddr commented on a diff in the pull request:
https://github.com/apache/flink/pull/5555#discussion_r183222089
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala
---
@@ -1439,7 +1467,47 @@ object AggregateUtil {
}
}
- (aggFieldIndexes, aggregates, accTypes, accSpecs)
+ // create distinct accumulator filter argument
+ val distinctAggs = new Array[Seq[DataViewSpec[_]]](aggregateCalls.size)
+
+ aggregateCalls.zipWithIndex.foreach {
+ case (aggCall, index) =>
+ if (aggCall.isDistinct) {
+ val argList: util.List[Integer] = aggCall.getArgList
+ // Only support single argument for distinct operation
+ if (argList.size() > 1) {
+ throw TableException(
+ "Cannot apply distinct filter on multiple input argument
fields at this moment!")
+ }
+ val relDataType =
aggregateInputType.getFieldList.get(argList.get(0)).getType
+ val fieldIndex = aggFieldIndexes(index)(0)
+ val mapViewTypeInfo = new MapViewTypeInfo(
+ FlinkTypeFactory.toTypeInfo(relDataType),
BasicTypeInfo.INT_TYPE_INFO)
+
+ distinctAggs(index) = Seq(
--- End diff --
`mapViewTypeInfo` doesn't seem to be available in codegen.
> Add runtime support of distinct filter using MapView
> -----------------------------------------------------
>
> Key: FLINK-8689
> URL: https://issues.apache.org/jira/browse/FLINK-8689
> Project: Flink
> Issue Type: Sub-task
> Reporter: Rong Rong
> Assignee: Rong Rong
> Priority: Major
>
> This ticket should cover distinct aggregate function support to codegen for
> *AggregateCall*, where *isDistinct* fields is set to true.
> This can be verified using the following SQL, which is not currently
> producing correct results.
> {code:java}
> SELECT
> a,
> SUM(b) OVER (PARTITION BY a ORDER BY proctime ROWS BETWEEN 5 PRECEDING AND
> CURRENT ROW)
> FROM
> MyTable{code}
>
>
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