org.apache.spark.sql.execution.command.AnalyzeTableCommand.scala Maven / Gradle / Ivy
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* 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
*
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package org.apache.spark.sql.execution.command
import org.apache.spark.sql.{AnalysisException, Row, SparkSession}
import org.apache.spark.sql.catalyst.TableIdentifier
import org.apache.spark.sql.catalyst.catalog.CatalogTableType
/**
* Analyzes the given table to generate statistics, which will be used in query optimizations.
*/
case class AnalyzeTableCommand(
tableIdent: TableIdentifier,
noscan: Boolean = true) extends RunnableCommand {
override def run(sparkSession: SparkSession): Seq[Row] = {
val sessionState = sparkSession.sessionState
val db = tableIdent.database.getOrElse(sessionState.catalog.getCurrentDatabase)
val tableIdentWithDB = TableIdentifier(tableIdent.table, Some(db))
val tableMeta = sessionState.catalog.getTableMetadata(tableIdentWithDB)
if (tableMeta.tableType == CatalogTableType.VIEW) {
throw new AnalysisException("ANALYZE TABLE is not supported on views.")
}
// Compute stats for the whole table
val newTotalSize = CommandUtils.calculateTotalSize(sessionState, tableMeta)
val newRowCount =
if (noscan) None else Some(BigInt(sparkSession.table(tableIdentWithDB).count()))
// Update the metastore if the above statistics of the table are different from those
// recorded in the metastore.
val newStats = CommandUtils.compareAndGetNewStats(tableMeta.stats, newTotalSize, newRowCount)
if (newStats.isDefined) {
sessionState.catalog.alterTableStats(tableIdentWithDB, newStats)
}
Seq.empty[Row]
}
}