hequn8128 commented on a change in pull request #7209: [FLINK-10977][table] Add
UnBounded FlatAggregate operator to streaming Table API
URL: https://github.com/apache/flink/pull/7209#discussion_r245668793
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
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@@ -367,6 +367,38 @@ class Table(
groupBy(fieldsExpr: _*)
}
+ /**
+ * Perform a global flatAggregate without groupBy. FlatAggregate takes a
TableAggregateFunction
+ * which returns multiple rows. Use a selection after the flatAggregate.
+ *
+ * Example:
+ *
+ * {{{
+ * val tableAggFunc: TableAggregateFunction = new MyTableAggregateFunction
+ * tab.flatAggregate(tableAggFunc('a, 'b)).select('_1, '_2, '_3)
+ * }}}
+ */
+ def flatAggregate(tableAggCall: TableAggFunctionCall): FlatAggTable = {
Review comment:
`TableAggFunctionCall` is also an `Expression`. We don't need the check
logic if we define the type as `TableAggFunctionCall`.
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