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Subject [GitHub] twalthr commented on a change in pull request #6359: [FLINK-6895][table]Add STR_TO_DATE supported in SQL
Date Wed, 08 Aug 2018 14:53:38 GMT
twalthr 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_r208613255
 
 

 ##########
 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:
   Yes, we cannot get the value of literals "yet". We can change this in our code to make
it work. But the question is how would this work for Calcite's type system?

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