spark ToStringSQLBuilder 源码
spark ToStringSQLBuilder 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/connector/ToStringSQLBuilder.scala
/*
* 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.spark.sql.internal.connector
import org.apache.spark.sql.connector.util.V2ExpressionSQLBuilder
/**
* The builder to generate `toString` information of V2 expressions.
*/
class ToStringSQLBuilder extends V2ExpressionSQLBuilder with Serializable {
override protected def visitUserDefinedScalarFunction(
funcName: String, canonicalName: String, inputs: Array[String]) =
s"""$funcName(${inputs.mkString(", ")})"""
override protected def visitUserDefinedAggregateFunction(
funcName: String,
canonicalName: String,
isDistinct: Boolean,
inputs: Array[String]): String = {
val distinct = if (isDistinct) "DISTINCT " else ""
s"""$funcName($distinct${inputs.mkString(", ")})"""
}
}
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