Github user shaoxuan-wang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3046#discussion_r95219196
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
---
@@ -785,13 +793,19 @@ class Table(
* will be processed by a single operator.
*
* @param groupWindow group-window that specifies how elements are
grouped.
- * @return A windowed table.
*/
- def window(groupWindow: GroupWindow): GroupWindowedTable = {
+ def window(groupWindow: GroupWindow): Table = {
if (tableEnv.isInstanceOf[BatchTableEnvironment]) {
throw new ValidationException(s"Windows on batch tables are
currently not supported.")
}
- new GroupWindowedTable(this, Seq(), groupWindow)
+ if (None == groupWindow.name) {
+ throw new ValidationException("An alias must be specified for the
window.")
+ }
+ if (windowPool.contains(groupWindow.name.get)) {
+ throw new ValidationException("The window alias can not be
duplicated.")
--- End diff --
s/"The window alias can not be duplicated."/"The same window alias has been
defined"/
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