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[MINOR][DOC] Add class document for PruneFileSourcePartitions and PruneHiveTablePartitions #27535

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[MINOR][DOC] Add class document for PruneFileSourcePartitions and PruneHiveTablePartitions #27535

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23813ec
Add classdoc for PruneFileSourcePartitions and PruneHiveTablePartitions
fuwhu Feb 11, 2020
5274b1a
Refin class doc
fuwhu Feb 11, 2020
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13 changes: 13 additions & 0 deletions ...src/main/scala/org/apache/spark/sql/execution/datasources/PruneFileSourcePartitions.scala
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Expand Up @@ -26,6 +26,19 @@ import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.execution.datasources.v2.{DataSourceV2ScanRelation, FileScan}
import org.apache.spark.sql.types.StructType

/**
* Prune the partitions of file source based table using partition filters. Currently, this rule
* is applied to [[HadoopFsRelation]] with [[CatalogFileIndex]] and [[DataSourceV2ScanRelation]]
* with [[FileScan]].
*
* For [[HadoopFsRelation]], the location will be replaced by pruned file index, and corresponding
* statistics will be updated. And the partition filters will be kept in the filters of returned
* logical plan.
*
* For [[DataSourceV2ScanRelation]], both partition filters and data filters will be added to
* its underlying [[FileScan]]. And the partition filters will be removed in the filters of
* returned logical plan.
*/
private[sql] object PruneFileSourcePartitions extends Rule[LogicalPlan] {

private def getPartitionKeyFiltersAndDataFilters(
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8 changes: 8 additions & 0 deletions sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/PruneHiveTablePartitions.scala
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Expand Up @@ -30,6 +30,14 @@ import org.apache.spark.sql.execution.datasources.DataSourceStrategy
import org.apache.spark.sql.internal.SQLConf

/**
* Prune hive table partitions using partition filters on [[HiveTableRelation]]. The pruned
* partitions will be kept in [[HiveTableRelation.prunedPartitions]], and the statistics of
* the hive table relation will be updated based on pruned partitions.
*
* This rule is executed in optimization phase, so the statistics can be updated before physical
* planning, which is useful for some spark strategy, eg.
* [[org.apache.spark.sql.execution.SparkStrategies.JoinSelection]].
*
* TODO: merge this with PruneFileSourcePartitions after we completely make hive as a data source.
*/
private[sql] class PruneHiveTablePartitions(session: SparkSession)
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