amaliujia commented on a change in pull request #12766:
URL: https://github.com/apache/beam/pull/12766#discussion_r487308868
##########
File path:
sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/translation/SqlOperators.java
##########
@@ -155,6 +156,25 @@ public static SqlFunction createZetaSqlFunction(String
name, SqlTypeName returnT
SqlFunctionCategory.USER_DEFINED_FUNCTION);
}
+ /**
+ * Create a dummy SqlAggFunction of type OTHER_FUNCTION from given function
name and return type.
+ * These functions will be executed by Beam CombineFns implemented in {@link
+ *
org.apache.beam.sdk.extensions.sql.impl.transform.BeamBuiltinAggregations}.
+ */
+ public static SqlAggFunction createZetaSqlAggFunction(String name,
RelDataType returnType) {
+ return new SqlAggFunction(
+ name,
+ null, // sqlIdentifier
+ SqlKind.OTHER_FUNCTION,
+ x -> returnType,
Review comment:
I am not sure whether this is the right trigger to override the return
type of an agg operator. Maybe the best to evaluate it is to support `AVG` in
ZetaSQL. As I recall the return type is different for ZetaSQL and Calcite when
input parameter type is `INT64` for `AVG`.
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