org.apache.flink.table.codegen.calls.PrintCallGen.scala Maven / Gradle / Ivy
/*
* 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.table.codegen.CodeGenUtils.{newNames, primitiveTypeTermForType}
import org.apache.flink.table.codegen.{CodeGeneratorContext, GeneratedExpression}
import org.apache.flink.table.types.{DataTypes, InternalType}
/**
* Generates PRINT function call.
*/
class PrintCallGen extends CallGenerator {
override def generate(
ctx: CodeGeneratorContext,
operands: Seq[GeneratedExpression],
returnType: InternalType,
nullCheck: Boolean): GeneratedExpression = {
val Seq(resultTerm, nullTerm) = newNames(Seq("result", "isNull"))
val resultTypeTerm = primitiveTypeTermForType(returnType)
// add logger, prefer name without number suffix to make sure only one definition
// exists in each operator in case of multiple print(s)
val logTerm = "logger$";
ctx.addReusableLogger(logTerm, "_Print$_")
val outputCode = if (returnType == DataTypes.BYTE_ARRAY) {
s"new String($resultTerm, java.nio.charset.Charset.defaultCharset())"
} else {
s"String.valueOf(${operands(1).resultTerm})"
}
val msgCode =
s"""
|(${operands.head.nullTerm} ? "null" : ${operands.head.resultTerm}.toString()) +
|(${operands(1).nullTerm} ? "null" : $outputCode)
""".stripMargin
val resultCode =
s"""
|${operands(1).code};
|$resultTypeTerm $resultTerm = ${operands(1).resultTerm};
|boolean $nullTerm = ${operands(1).nullTerm};
|org.slf4j.MDC.put("fromUser", "TRUE");
|$logTerm.error($msgCode);
|System.out.println($msgCode);
""".stripMargin
GeneratedExpression(resultTerm, nullTerm, resultCode, returnType)
}
}