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https://issues.apache.org/jira/browse/FLINK-3940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15404216#comment-15404216
]
ASF GitHub Bot commented on FLINK-3940:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/2282#discussion_r73180693
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/DataSetSort.scala
---
@@ -71,11 +78,57 @@ class DataSetSort(
partitionedDs = partitionedDs.sortPartition(fieldCollation._1,
fieldCollation._2)
}
+ val offsetAndFetchDS = if (offset != null) {
+ val offsetIndex = RexLiteral.intValue(offset)
+ val fetchIndex = if (fetch != null) {
+ RexLiteral.intValue(fetch) + offsetIndex
+ } else {
+ Int.MaxValue
+ }
+ if (currentParallelism != 1) {
+ val partitionCount = partitionedDs.mapPartition(
+ new MapPartitionFunction[Any, Int] {
+ override def mapPartition(value: lang.Iterable[Any], out:
Collector[Int]): Unit = {
+ val iterator = value.iterator()
+ var elementCount = 0
+ while (iterator.hasNext) {
+ elementCount += 1
+ iterator -> iterator.next()
--- End diff --
I think `->` is unintended right?
> Add support for ORDER BY OFFSET FETCH
> -------------------------------------
>
> Key: FLINK-3940
> URL: https://issues.apache.org/jira/browse/FLINK-3940
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Affects Versions: 1.1.0
> Reporter: Fabian Hueske
> Assignee: GaoLun
> Priority: Minor
>
> Currently only ORDER BY without OFFSET and FETCH are supported.
> This issue tracks the effort to add support for OFFSET and FETCH and involves:
> - Implementing the execution strategy in `DataSetSort`
> - adapting the `DataSetSortRule` to support OFFSET and FETCH
> - extending the Table API and validation to support OFFSET and FETCH and
> generate a corresponding RelNode.
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