[GitHub] spark pull request #18292: [SPARK-21083][SQL] Do not remove correct column s...

[cloud-fan <gi...@git.apache.org>]

Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18292#discussion_r126274515
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzeColumnCommand.scala ---
    @@ -42,17 +42,20 @@ case class AnalyzeColumnCommand(
         if (tableMeta.tableType == CatalogTableType.VIEW) {
           throw new AnalysisException("ANALYZE TABLE is not supported on views.")
         }
    -    val sizeInBytes = CommandUtils.calculateTotalSize(sessionState, tableMeta)
     
    +    val newSize = CommandUtils.calculateTotalSize(sessionState, tableMeta)
         // Compute stats for each column
    -    val (rowCount, newColStats) = computeColumnStats(sparkSession, tableIdentWithDB, columnNames)
    +    val (newRowCount, colStats) = computeColumnStats(sparkSession, tableIdentWithDB, columnNames)
    +
    +    // Because we will invalidate or update stats when table is changed, if column stats exist,
    +    // they should be correct. Hence, we can combine previous column stats and the newly collected
    +    // column stats.
    +    val oldColStats = tableMeta.stats.map(_.colStats).getOrElse(Map.empty)
    +    val newColStats = oldColStats ++ colStats
     
         // We also update table-level stats in order to keep them consistent with column-level stats.
         val statistics = CatalogStatistics(
    -      sizeInBytes = sizeInBytes,
    -      rowCount = Some(rowCount),
    -      // Newly computed column stats should override the existing ones.
    -      colStats = tableMeta.stats.map(_.colStats).getOrElse(Map.empty) ++ newColStats)
    --- End diff --
    
    seems we already did it?


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