Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/14712#discussion_r76386878
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -401,6 +401,13 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
}
}
+ override def alterTableStats(tableDefinition: CatalogTable): Unit =
withClient {
--- End diff --
Now I remember why I add this method. If we've already run the analyze
command, then we have Statistics having rowCount, say 100. Now we run alter
table command to set "numRows" to 200 (without setting
STATS_GENERATED_VIA_STATS_TASK to true). If we use the same alterTable method,
since Statistics is defined, we will set numRows and
STATS_GENERATED_VIA_STATS_TASK into properties, just like we do for analyze
command.
Then, the parameters in Hive are numRows=100,
STATS_GENERATED_VIA_STATS_TASK=true, COLUMN_STATS_ACCURATE=true, while the
expected result would be numRows=200, STATS_GENERATED_VIA_STATS_TASK=false,
COLUMN_STATS_ACCURATE=false
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