Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/2390#discussion_r17526580
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/commands.scala ---
@@ -166,3 +166,22 @@ case class DescribeCommand(child: SparkPlan, output:
Seq[Attribute])(
child.output.map(field => Row(field.name, field.dataType.toString,
null))
}
}
+
+/**
+ * :: DeveloperApi ::
+ */
+@DeveloperApi
+case class CacheTableAsSelectCommand(tableName: String, plan: LogicalPlan)
+ extends LeafNode with Command {
+
+ override protected[sql] lazy val sideEffectResult = {
+ sqlContext.catalog.registerTable(None, tableName,
sqlContext.executePlan(plan).analyzed)
+ sqlContext.cacheTable(tableName)
+ // It does the caching eager.
--- End diff --
@marmbrus I've seen your comments in
[SPARK-2594](https://issues.apache.org/jira/browse/SPARK-2594), I'd be OK with
both being lazy or eager, but I think this statement should be consistent with
`CACHE TABLE <name>` and `SQLContext.cacheTable`, which are now lazy. Otherwise
it would be rather confusing.
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