Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18334#discussion_r124971615
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -774,6 +774,12 @@ object SQLConf {
.doubleConf
.createWithDefault(0.05)
+ val AUTO_UPDATE_SIZE =
+ buildConf("spark.sql.statistics.autoUpdate.size")
+ .doc("Enables automatic update for table size once table's data is
changed.")
--- End diff --
This flag could slow down the whole data change commands. We need to
clearly explain the potential performance regression. Based on the current
description, all the users are willing to turn it on. Normally, the users
expect we are doing the incremental updates, instead of recalculating it.
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