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Subject [GitHub] buptljy commented on a change in pull request #6359: [FLINK-6895][table]Add STR_TO_DATE supported in SQL
Date Mon, 13 Aug 2018 13:57:44 GMT
buptljy commented on a change in pull request #6359: [FLINK-6895][table]Add STR_TO_DATE supported
in SQL
URL: https://github.com/apache/flink/pull/6359#discussion_r209618514

 File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/StrToDateCallGen.scala
 @@ -0,0 +1,48 @@
+ * 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.codegen.calls
+import org.apache.flink.api.common.typeinfo.SqlTimeTypeInfo
+import org.apache.flink.table.codegen.calls.CallGenerator.generateCallIfArgsNotNull
+import org.apache.flink.table.codegen.{CodeGenerator, GeneratedExpression}
+import org.apache.flink.table.runtime.functions.DateTimeFunctions
+  * Generates StrToDate call based on the type of last operand.
+  */
+class StrToDateCallGen extends CallGenerator {
+  override def generate(codeGenerator: CodeGenerator,
+                        operands: Seq[GeneratedExpression]): GeneratedExpression = {
+    if (operands.last.literal) {
 Review comment:
   @twalthr Could you show an example of the conflicts between LiteralExpression and calcite
type system? From my perspective, the GeneratedExpression is used in the generation of flink
functions like what we do in ExpressionReducer: line 95. If the current GeneratedExpression
is okay, why won't the child class LiteralExpression be okay?
   Sorry I still can't get your points.

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