/
MetastoreIndex.scala
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/
MetastoreIndex.scala
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/*
* Copyright 2016 Lightcopy
*
* Licensed 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
import org.apache.hadoop.fs.Path
import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.expressions.Expression
import org.apache.spark.sql.sources.Filter
import org.apache.spark.sql.types.StructType
/**
* [[MetastoreIndexCatalog]] is a wrapper on index metadata stored in [[Metastore]]. Currently
* designed to provide catalog with single table path.
*/
abstract class MetastoreIndex extends FileIndex with Logging {
/** Fully qualified table path */
def tablePath: Path
/** Schema of the partitioning columns, or the empty schema if the table is not partitioned. */
def partitionSchema: StructType
/** Index schema, used to prune files based on filters for indexed columns */
def indexSchema: StructType
/** Return schema for listed files */
def dataSchema: StructType
/** Set index filters for this catalog */
def setIndexFilters(filters: Seq[Filter])
/** Return index filters that were set in `setIndexFilters` method */
def indexFilters: Seq[Filter]
/**
* Return all valid files grouped into partitions that confirm to partition filters and index
* filters when available.
* @param partitionFilters filters used to prune which partitions are returned
* @param dataFilters filters that can be applied on non-partitioned columns.
* @param indexFilters filters used to select files based on provided index
*/
def listFilesWithIndexSupport(
partitionFilters: Seq[Expression],
dataFilters: Seq[Expression],
indexFilters: Seq[Filter]): Seq[PartitionDirectory]
/** Returns the list of files that will be read when scanning this relation */
def inputFiles: Array[String]
/** Sum of table file sizes, in bytes */
def sizeInBytes: Long
/** Refresh the file listing */
def refresh(): Unit = { }
/** Returns the list of input paths from which the catalog will get files */
final def rootPaths: Seq[Path] = Seq(tablePath)
/**
* Returns all valid files grouped into partitions when the data is partitioned. If the data is
* unpartitioned, this will return a single partition with no partition values.
* @param partitionFilters filters used to prune which partitions are returned.
* @param dataFilters filters that can be applied on non-partitioned columns.
*/
final def listFiles(
partitionFilters: Seq[Expression],
dataFilters: Seq[Expression]): Seq[PartitionDirectory] = {
listFilesWithIndexSupport(partitionFilters, Nil, indexFilters)
}
}