hequn8128 commented on a change in pull request #7235: [FLINK-10976] [table]
Add support for aggregate to table API
URL: https://github.com/apache/flink/pull/7235#discussion_r240877583
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
##########
@@ -999,6 +999,47 @@ class Table(
new OverWindowedTable(this, overWindows.toArray)
}
+ /**
+ * Performs a global aggregate operation with an aggregate function. Use
this before a selection
+ * to perform the selection operation. The output will be flattened if the
output type is a
+ * composite type.
+ *
+ * Example:
+ *
+ * {{{
+ * val aggFunc: AggregateFunction[_, _] = new MyAggregateFunction
+ * tableEnv.registerFunction("aggFunc", aggFunc);
+ * table.aggregate("aggFunc(a, b) as (f0, f1, f2)").select('f0, 'f1)
+ * }}}
+ */
+ def aggregate(aggregateFunction: Expression): AggregatedTable = {
+ unwrap(aggregateFunction, tableEnv) match {
+ case _: Aggregation =>
+ case _ => throw new ValidationException("Only AggregateFunction can be
used in aggregate.")
+ }
+
+ new AggregatedTable(this, Nil, aggregateFunction)
+ }
+
+ /**
+ * Performs a global aggregate operation with an aggregate function. Use
this before a selection
+ * to perform the selection operation. The output will be flattened if the
output type is a
+ * composite type.
+ *
+ * Example:
+ *
+ * {{{
+ * val aggFunc: AggregateFunction[_, _] = new MyAggregateFunction
+ * tableEnv.registerFunction("aggFunc", aggFunc);
+ * table.aggregate("aggFunc(a, b) as (f0, f1, f2)").select("f0, f1")
+ * }}}
+ */
+ def aggregate(aggregateFunction: String): AggregatedTable = {
+ val withResolvedAggFunctionCall = replaceAggFunctionCall(
Review comment:
Replace with `groupBy().aggregate(aggregateFunction)`
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