/
UDTUtils.scala
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/
UDTUtils.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.spark.sql.catalyst.util
import scala.util.control.NonFatal
import org.apache.spark.SparkUnsupportedOperationException
import org.apache.spark.sql.types.UserDefinedType
import org.apache.spark.util.SparkClassUtils
/**
* Utilities for working with [[UserDefinedType]]s from within the `sql/api` project. UDTs are not
* not fully supported in `sql/api` (and connect), they can currently only be used in conjunction
* with catalyst because they (amongst others) require access to Spark SQLs internal data
* representation.
*
* This interface and its companion object provide an escape hatch for working with UDTs from within
* the api project (e.g. Row.toJSON). The companion will try to bind to an implementation of the
* interface in catalyst, if none is found it will bind to [[DefaultUDTUtils]].
*/
private[sql] trait UDTUtils {
/**
* Convert the UDT instance to something that is compatible with [[org.apache.spark.sql.Row]].
* The returned value must conform to the schema of the UDT.
*/
def toRow(value: Any, udt: UserDefinedType[Any]): Any
}
private[sql] object UDTUtils extends UDTUtils {
private val delegate = try {
val cls = SparkClassUtils.classForName("org.apache.spark.sql.catalyst.util.UDTUtilsImpl")
cls.getConstructor().newInstance().asInstanceOf[UDTUtils]
} catch {
case NonFatal(_) =>
DefaultUDTUtils
}
override def toRow(value: Any, udt: UserDefinedType[Any]): Any = delegate.toRow(value, udt)
}
private[sql] object DefaultUDTUtils extends UDTUtils {
override def toRow(value: Any, udt: UserDefinedType[Any]): Any = {
throw SparkUnsupportedOperationException()
}
}