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https://issues.apache.org/jira/browse/FLINK-8325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332418#comment-16332418
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ASF GitHub Bot commented on FLINK-8325:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5241#discussion_r162639253
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/aggfunctions/CountAggFunction.scala
---
@@ -33,7 +33,20 @@ class CountAccumulator extends JTuple1[Long] {
/**
* built-in count aggregate function
*/
-class CountAggFunction extends AggregateFunction[JLong, CountAccumulator] {
+class CountAggFunction
+ extends AggregateFunction[JLong, CountAccumulator] {
+
+ // process argument is optimized by Calcite.
+ // For instance count(42) or count(*) which will optimized to count().
--- End diff --
`For instance count(42) or count(*) which will optimized to count().` ->
`For instance count(42) or count(*) will be optimized to count().`
> Add COUNT AGG support constant parameter, i.e. COUNT(*), COUNT(1)
> ------------------------------------------------------------------
>
> Key: FLINK-8325
> URL: https://issues.apache.org/jira/browse/FLINK-8325
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.5.0
> Reporter: sunjincheng
> Assignee: sunjincheng
> Priority: Major
>
> COUNT(1) with Group Window, always output 0.
> e.g.
> DATA:
> {code}
> val data = List(
> (1L, 1, "Hi"),
> (2L, 2, "Hello"),
> (4L, 2, "Hello"),
> (8L, 3, "Hello world"),
> (16L, 3, "Hello world"))
> {code}
> SQL:
> {code}
> SELECT b, COUNT(1) FROM MyTable GROUP BY Hop(proctime, interval '0.001'
> SECOND, interval '0.002' SECOND),b
> {code}
> OUTPUT:
> {code}
> 1,0,1,
> 1,0,1,
> 2,0,1,
> 2,0,1,
> 2,0,2,
> 3,0,1,
> 3,0,1
> {code}
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