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Subject [GitHub] [flink] beyond1920 commented on a change in pull request #8035: [FLINK-11975][table-planner-blink] Support to run a sql query : 'SELECT * FROM (VALUES (1, 2, 3)) T(a, b, c)'
Date Mon, 25 Mar 2019 07:51:16 GMT
beyond1920 commented on a change in pull request #8035: [FLINK-11975][table-planner-blink]
Support to run a sql query : 'SELECT * FROM (VALUES (1, 2, 3)) T(a, b, c)'
URL: https://github.com/apache/flink/pull/8035#discussion_r268517534
 
 

 ##########
 File path: flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/codegen/InputFormatCodeGenerator.scala
 ##########
 @@ -0,0 +1,93 @@
+/*
+ * 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
+
+import org.apache.flink.api.common.io.GenericInputFormat
+import org.apache.flink.table.codegen.CodeGenUtils.newName
+import org.apache.flink.table.codegen.Indenter.toISC
+import org.apache.flink.table.dataformat.GenericRow
+import org.apache.flink.table.generated.GeneratedInput
+import org.apache.flink.table.`type`.InternalType
+
+/**
+  * A code generator for generating Flink [[GenericInputFormat]]s.
+  */
+object InputFormatCodeGenerator {
+
+  /**
+    * Generates a values input format that can be passed to Java compiler.
+    *
+    * @param ctx The code generator context
+    * @param name Class name of the input format. Must not be unique but has to be a
+    *             valid Java class identifier.
+    * @param records code for creating records
+    * @param returnType expected return type
+    * @param outRecordTerm term of the output
+    * @tparam T Return type of the Flink Function.
+    * @return instance of GeneratedFunction
+    */
+  def generateValuesInputFormat[T](
+    ctx: CodeGeneratorContext,
+    name: String,
+    records: Seq[String],
+    returnType: InternalType,
+    outRecordTerm: String = CodeGeneratorContext.DEFAULT_OUT_RECORD_TERM,
+    outRecordWriterTerm: String = CodeGeneratorContext.DEFAULT_OUT_RECORD_WRITER_TERM)
+  : GeneratedInput[GenericInputFormat[T]] = {
+    val funcName = newName(name)
+
+    ctx.addReusableOutputRecord(returnType, classOf[GenericRow], outRecordTerm,
+                                Some(outRecordWriterTerm))
+
+    val funcCode = j"""
+      public class $funcName extends ${classOf[GenericInputFormat[_]].getCanonicalName} {
+
+        private int nextIdx = 0;
+
+        ${ctx.reuseMemberCode()}
+
+        public $funcName() throws Exception {
+          ${ctx.reuseInitCode()}
+        }
+
+        @Override
+        public boolean reachedEnd() throws java.io.IOException {
+          return nextIdx >= ${records.length};
+        }
+
+        @Override
+        public Object nextRecord(Object reuse) {
+          switch (nextIdx) {
+            ${records.zipWithIndex.map { case (r, i) =>
+      s"""
 
 Review comment:
   done

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