spark MapData 源码
spark MapData 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/MapData.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.catalyst.util
import org.apache.spark.sql.types.DataType
/**
* This is an internal data representation for map type in Spark SQL. This should not implement
* `equals` and `hashCode` because the type cannot be used as join keys, grouping keys, or
* in equality tests. See SPARK-9415 and PR#13847 for the discussions.
*/
abstract class MapData extends Serializable {
def numElements(): Int
def keyArray(): ArrayData
def valueArray(): ArrayData
def copy(): MapData
def foreach(keyType: DataType, valueType: DataType, f: (Any, Any) => Unit): Unit = {
val length = numElements()
val keys = keyArray()
val values = valueArray()
var i = 0
while (i < length) {
f(keys.get(i, keyType), values.get(i, valueType))
i += 1
}
}
}
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