spark ParquetColumn 源码
spark ParquetColumn 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetColumn.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.execution.datasources.parquet
import org.apache.parquet.column.ColumnDescriptor
import org.apache.parquet.io.GroupColumnIO
import org.apache.parquet.io.PrimitiveColumnIO
import org.apache.parquet.schema.Type.Repetition
import org.apache.spark.sql.types.DataType
/**
* Rich information for a Parquet column together with its SparkSQL type.
*/
case class ParquetColumn(
sparkType: DataType,
descriptor: Option[ColumnDescriptor], // only set when this is a primitive column
repetitionLevel: Int,
definitionLevel: Int,
required: Boolean,
path: Seq[String],
children: Seq[ParquetColumn]) {
def isPrimitive: Boolean = descriptor.nonEmpty
}
object ParquetColumn {
def apply(sparkType: DataType, io: PrimitiveColumnIO): ParquetColumn = {
this(sparkType, Some(io.getColumnDescriptor), io.getRepetitionLevel,
io.getDefinitionLevel, io.getType.isRepetition(Repetition.REQUIRED),
io.getFieldPath, Seq.empty)
}
def apply(sparkType: DataType, io: GroupColumnIO, children: Seq[ParquetColumn]): ParquetColumn = {
this(sparkType, None, io.getRepetitionLevel,
io.getDefinitionLevel, io.getType.isRepetition(Repetition.REQUIRED),
io.getFieldPath, children)
}
}
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