[GitHub] [spark] dongjoon-hyun commented on a change in pull request #24200: [SPARK-27266][SQL] Support ANALYZE TABLE to collect tables stats for cached catalog views

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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
 
 

 ##########
 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, for now, this PR is much better because this prevents `AnalysisException` by supporting this. We can add doc later before 3.0.0 release (if needed.).

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