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Subject [GitHub] [flink] twalthr commented on a change in pull request #8062: [FLINK-11884][table] Implement expression resolution on top of new Expressions
Date Mon, 08 Apr 2019 16:19:50 GMT
twalthr commented on a change in pull request #8062:  [FLINK-11884][table] Implement expression
resolution on top of new Expressions
URL: https://github.com/apache/flink/pull/8062#discussion_r273101387
 
 

 ##########
 File path: flink-table/flink-table-planner/src/main/java/org/apache/flink/table/expressions/rules/WrapInOrderRule.java
 ##########
 @@ -0,0 +1,69 @@
+/*
+ * 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.flink.table.expressions.rules;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.expressions.ApiExpressionDefaultVisitor;
+import org.apache.flink.table.expressions.CallExpression;
+import org.apache.flink.table.expressions.Expression;
+import org.apache.flink.table.expressions.FunctionDefinition;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static java.util.Collections.singletonList;
+import static org.apache.flink.table.expressions.BuiltInFunctionDefinitions.ORDER_ASC;
+import static org.apache.flink.table.expressions.BuiltInFunctionDefinitions.ORDER_DESC;
+
+/**
+ * Makes sure that all expressions are wrapped in ordering expression. If the expression
is either
+ * {@link org.apache.flink.table.expressions.BuiltInFunctionDefinitions#ORDER_ASC} or
+ * {@link org.apache.flink.table.expressions.BuiltInFunctionDefinitions#ORDER_DESC} it does
nothing, otherwise
+ * it inserts {@link org.apache.flink.table.expressions.BuiltInFunctionDefinitions#ORDER_ASC}.
+ */
+@Internal
+final class WrapInOrderRule implements ResolverRule {
 
 Review comment:
   This logic belongs more to the tree builder than expression resolver.

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