[GitHub] [flink] wuchong commented on a change in pull request #12819: [FLINK-18440][table-planner-blink] Allow ROW/RANGE with RANK, DENSE_RANK or ROW_NUMBER functions on window stream

[GitBox <gi...@apache.org>]

wuchong commented on a change in pull request #12819:
URL: https://github.com/apache/flink/pull/12819#discussion_r449993292



##########
File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/calcite/sql/SqlRankFunction.java
##########
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.calcite.sql;
+
+import org.apache.calcite.sql.type.OperandTypes;
+import org.apache.calcite.sql.type.ReturnTypes;
+import org.apache.calcite.sql.type.SqlReturnTypeInference;
+import org.apache.calcite.util.Optionality;
+
+/**
+ * Operator which aggregates sets of values into a result.
+ */
+public class SqlRankFunction extends SqlAggFunction {
+	//~ Constructors -----------------------------------------------------------
+
+	@Deprecated
+	public SqlRankFunction(boolean requiresOrder, SqlKind kind) {
+		this(kind, ReturnTypes.INTEGER, requiresOrder);
+	}
+
+	public SqlRankFunction(SqlKind kind, SqlReturnTypeInference returnTypes,
+						   boolean requiresOrder) {
+		super(kind.name(), null, kind, returnTypes, null,
+			OperandTypes.NILADIC, SqlFunctionCategory.NUMERIC, requiresOrder,
+			true, Optionality.FORBIDDEN);
+	}
+
+	//~ Methods ----------------------------------------------------------------
+
+	// FLINK-18440:
+	// Allow ROW/RANGE with RANK, DENSE_RANK or ROW_NUMBER functions on window stream
+	@Override public boolean allowsFraming() {
+		return true;

Review comment:
       What's the relationship between micro batch and this?




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