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https://issues.apache.org/jira/browse/FLINK-6228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977662#comment-15977662
]
ASF GitHub Bot commented on FLINK-6228:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3743#discussion_r112461145
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/ProjectionTranslator.scala
---
@@ -216,6 +216,26 @@ object ProjectionTranslator {
projectList += unresolved
}
+ case OverCall(agg, aggAlias, alias, _) =>
+ val overWindow = overWindows.find(_.alias.equals(alias))
+ val aggName = agg.child.asInstanceOf[UnresolvedFieldReference].name
+ val childrenOutput = parent.output
+ val candidates =
childrenOutput.filter(_.name.equalsIgnoreCase(aggName))
+
+ val resolvedFieldReference = if (candidates.length > 1) {
+ throw new TableException(s"Reference $aggName is ambiguous.")
+ } else if (candidates.isEmpty) {
+ throw new TableException(s"Can not resolve [$aggName].")
+ } else {
+ Some(candidates.head.withName(aggName))
+ }
+
+ projectList += new OverCall(
--- End diff --
remove `new`
> Integrating the OVER windows in the Table API
> ---------------------------------------------
>
> Key: FLINK-6228
> URL: https://issues.apache.org/jira/browse/FLINK-6228
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> Syntax:
> {code}
> table
> .overWindows(
> (Rows|Range [ partitionBy value_expression , ... [ n ]] [ orderBy
> order_by_expression]
> (preceding
> UNBOUNDED|value_specification.(rows|milli|second|minute|hour|day|month|year)|CURRENTROW)
> [following
> UNBOUNDED|value_specification.(rows|milli|second|minute|hour|day|month|year)|CURRENTROW]
> as alias,...[n])
> )
> .select( [col1,...[n]], (agg(col1) OVER overWindowAlias, … [n])
> {code}
> Implement restrictions:
> * All OVER clauses in the same SELECT clause must be exactly the same.
> * The PARTITION BY clause is optional (no partitioning results in single
> threaded execution).
> * The ORDER BY Before the
> [FLINK-5884|https://issues.apache.org/jira/browse/FLINK-5884] implementation
> orderBy may only have ‘rowtime/’proctime(for stream)/‘specific-time-field(for
> batch).
> * FOLLOWING is not supported.
> User interface design document [See |
> https://docs.google.com/document/d/13Z-Ovx3jwtmzkSweJyGkMy751BouhuJ29Y1CTNZt2DI/edit#]
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