Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1238#discussion_r15206175
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -263,6 +268,19 @@ private[hive] case class MetastoreRelation
new Partition(hiveQlTable, p)
}
+ @transient override lazy val statistics = Statistics(
+ // TODO: check if this estimate is valid for tables after partition
pruning.
+ sizeInBytes = {
+ // NOTE: kind of hacky, but this should be relatively cheap if
parameters for the table are
+ // populated into the metastore. An alternative would be going
through Hadoop's FileSystem
+ // API, which can be expensive if a lot of RPCs are involved.
Besides `totalSize`, there are
+ // also `numFiles`, `numRows`, `rawDataSize` keys we can look at in
the future.
+ val sizeMaybeFromMetastore =
+
Option(hiveQlTable.getParameters.get("totalSize")).map(_.toLong).getOrElse(-1L)
+ math.max(sizeMaybeFromMetastore, 1L)
--- End diff --
Why `1L` and not default size?
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