Github user cloud-fan commented on a diff in the pull request:
    --- Diff: 
    @@ -378,6 +380,47 @@ private[hive] class HiveClientImpl(
           val properties = Option(h.getParameters).map(_.asScala.toMap).orNull
    +      val excludedTableProperties = Set(
    +        // The following are hive-generated statistics fields. Currently, 
only total_size and
    +        // row_count are used to populate the dedicated field `stats`.
    +        // TODO: stats should include all the other three fields.
    +        StatsSetupConst.COLUMN_STATS_ACCURATE,
    +        StatsSetupConst.NUM_FILES,
    +        StatsSetupConst.NUM_PARTITIONS,
    +        StatsSetupConst.ROW_COUNT,
    +        StatsSetupConst.RAW_DATA_SIZE,
    --- End diff --
    how about we only handle the 2 we need? i.e. `TOTAL_SIZE` and 
`RAW_DATA_SIZE`. Then we don't need to do an extra `getTable` call in 
`alterTable`, which may cause performance regression.
    Ideally the rule is, we only drop the hive properties that we moved to 
other places, so that we can reconstruct them without an extra `getTable` call.

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