dongjoon-hyun commented on a change in pull request #24200: [SPARK-27266][SQL]
Support ANALYZE TABLE to collect tables stats for cached catalog views
URL: https://github.com/apache/spark/pull/24200#discussion_r270693277
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzeTableCommand.scala
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@@ -35,19 +35,29 @@ case class AnalyzeTableCommand(
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(sparkSession, tableMeta)
- val newRowCount =
- if (noscan) None else
Some(BigInt(sparkSession.table(tableIdentWithDB).count()))
+ // Analyzes a catalog view if the view is cached
+ val table = sparkSession.table(tableIdent.quotedString)
+ val cacheManager = sparkSession.sharedState.cacheManager
+ if (cacheManager.lookupCachedData(table.logicalPlan).isDefined) {
+ if (!noscan) {
+ // To collect table stats, materializes an underlying columnar RDD
+ table.count()
+ }
Review comment:
If `noscan` is `true`, this is no-op. We may want to show some warning or
info here later. However, this is not a big deal. For now, this PR is much
better than before because this prevents `AnalysisException` by supporting
this. We can add doc later before 3.0.0 release (if needed.).
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