[
https://issues.apache.org/jira/browse/FLINK-6465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179245#comment-16179245
]
ASF GitHub Bot commented on FLINK-6465:
---------------------------------------
Github user haohui commented on a diff in the pull request:
https://github.com/apache/flink/pull/4556#discussion_r140824914
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala
---
@@ -1406,6 +1406,61 @@ object AggregateUtil {
}
}
}
+ case sqlFirstLastValueAggFunction: SqlFirstLastValueAggFunction =>
+
+ aggregates(index) = if (sqlFirstLastValueAggFunction.getKind ==
SqlKind.FIRST_VALUE) {
+ if (needRetraction) {
+ sqlTypeName match {
--- End diff --
Convert it to a map
> support FIRST_VALUE on Table API & SQL
> --------------------------------------
>
> Key: FLINK-6465
> URL: https://issues.apache.org/jira/browse/FLINK-6465
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: sunjincheng
>
> {{FIRST_VALUE}} is a OVER WINDOW function. In this JIRA. will add
> {{FIRST_VALUE}} function support on TableAPI & SQL.
> *Syntax:*
> FIRST_VALUE ( [scalar_expression ] )
> OVER ( [ partition_by_clause ] order_by_clause [ rows_range_clause ] )
> [About OVER
> WINDOWS|https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/table/tableApi.html#over-windows]
> scalar_expression
> Is the value to be returned. scalar_expression can be a column, or other
> arbitrary expression that results in a single value. Other analytic functions
> are not permitted.
> *NOTE:*
> * {{FIRST_VALUE}} if used for OVER WINDOW, e.g.:
> {code}
> SELECT A, B, FIRST_VALUE(C) OVER (ORDER BY E) AS firstValue FROM tab
> {code}
> * OVER WINDOW's retraction is expensive(currently not supported yet), and
> this JIRA. does not implement Retract logic of {{FIRST_VALUE}}.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
