org.apache.flink.table.planner.codegen.calls.PrintCallGen.scala Maven / Gradle / Ivy
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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.planner.codegen.calls
import org.apache.flink.table.planner.codegen.CodeGenUtils.{newNames, primitiveTypeTermForType}
import org.apache.flink.table.planner.codegen.{CodeGeneratorContext, GeneratedExpression}
import org.apache.flink.table.runtime.typeutils.TypeCheckUtils.isBinaryString
import org.apache.flink.table.types.logical.LogicalType
import java.nio.charset.StandardCharsets
/**
* Generates PRINT function call.
*/
class PrintCallGen extends CallGenerator {
override def generate(
ctx: CodeGeneratorContext,
operands: Seq[GeneratedExpression],
returnType: LogicalType): GeneratedExpression = {
val Seq(resultTerm, nullTerm) = newNames("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 charsets = classOf[StandardCharsets].getCanonicalName
val outputCode = if (isBinaryString(returnType)) {
s"new String($resultTerm, $charsets.UTF_8)"
} else {
s"String.valueOf(${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)
}
}