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TableFunctionCallGen.scala
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TableFunctionCallGen.scala
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/*
* 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.functions.TableFunction
import org.apache.flink.table.planner.codegen.GeneratedExpression.NEVER_NULL
import org.apache.flink.table.planner.codegen.calls.ScalarFunctionCallGen.prepareFunctionArgs
import org.apache.flink.table.planner.codegen.{CodeGeneratorContext, GeneratedExpression}
import org.apache.flink.table.planner.functions.utils.UserDefinedFunctionUtils.getEvalMethodSignature
import org.apache.flink.table.types.logical.LogicalType
/**
* Generates a call to user-defined [[TableFunction]].
*
* @param tableFunction user-defined [[TableFunction]] that might be overloaded
*/
class TableFunctionCallGen(tableFunction: TableFunction[_]) extends CallGenerator {
override def generate(
ctx: CodeGeneratorContext,
operands: Seq[GeneratedExpression],
returnType: LogicalType): GeneratedExpression = {
// convert parameters for function (output boxing)
val parameters = prepareUDFArgs(ctx, operands, tableFunction)
// generate function call
val functionReference = ctx.addReusableFunction(tableFunction)
val functionCallCode =
s"""
|${parameters.map(_.code).mkString("\n")}
|$functionReference.eval(${parameters.map(_.resultTerm).mkString(", ")});
|""".stripMargin
// has no result
GeneratedExpression(
functionReference,
NEVER_NULL,
functionCallCode,
returnType)
}
def prepareUDFArgs(
ctx: CodeGeneratorContext,
operands: Seq[GeneratedExpression],
func: TableFunction[_]): Array[GeneratedExpression] = {
// get the expanded parameter types
var paramClasses = getEvalMethodSignature(func, operands.map(_.resultType).toArray)
prepareFunctionArgs(ctx, operands, paramClasses, func.getParameterTypes(paramClasses))
}
}