Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14971#discussion_r79281395
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
---
@@ -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 --
ah I see. So our targets are:
1. recognize hive statistics, i.e. we should set the `CatalogTable.stats`
according to hive stats properties
2. don't overwrite hive stats properties.
3. SHOW CREATE TABLE shouldn't print hive stats properties.
My proposal: In `HiveClientImpl`, set `CatalogTable.stats` by hive stats
properties, and still keep them in table properties. In SHOW CREATE TABLE, hide
the hive stats properties.
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