spark ObjectType 源码
spark ObjectType 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/types/ObjectType.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.types
import org.apache.spark.sql.errors.QueryExecutionErrors
object ObjectType extends AbstractDataType {
override private[sql] def defaultConcreteType: DataType =
throw QueryExecutionErrors.nullLiteralsCannotBeCastedError(ObjectType.simpleString)
override private[sql] def acceptsType(other: DataType): Boolean = other match {
case ObjectType(_) => true
case _ => false
}
override private[sql] def simpleString: String = "Object"
}
/**
* Represents a JVM object that is passing through Spark SQL expression evaluation.
*/
case class ObjectType(cls: Class[_]) extends DataType {
override def defaultSize: Int = 4096
def asNullable: DataType = this
override def simpleString: String = cls.getName
override def acceptsType(other: DataType): Boolean = other match {
case ObjectType(otherCls) => cls.isAssignableFrom(otherCls)
case _ => false
}
}
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