Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/11555#discussion_r55444644
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala ---
@@ -297,22 +299,34 @@ class SQLBuilder(logicalPlan: LogicalPlan,
sqlContext: SQLContext) extends Loggi
)
}
+ private def windowToSQL(w: Window): String = {
+ build(
+ "SELECT",
+ (w.child.output ++ w.windowExpressions).map(_.sql).mkString(", "),
+ if (w.child == OneRowRelation) "" else "FROM",
+ toSQL(w.child)
+ )
+ }
+
object Canonicalizer extends RuleExecutor[LogicalPlan] {
override protected def batches: Seq[Batch] = Seq(
- Batch("Canonicalizer", FixedPoint(100),
+ Batch("Collapse Project", FixedPoint(100),
// The `WidenSetOperationTypes` analysis rule may introduce extra
`Project`s over
// `Aggregate`s to perform type casting. This rule merges these
`Project`s into
// `Aggregate`s.
- CollapseProject,
-
+ CollapseProject),
+ Batch("Recover Scoping Info", Once,
// Used to handle other auxiliary `Project`s added by analyzer
(e.g.
// `ResolveAggregateFunctions` rule)
- RecoverScopingInfo
+ AddSubquery,
+ // Previous rule will add extra sub-queries, this rule is used to
re-propagate and update
+ // the qualifiers bottom up.
+ UpdateQualifiers
--- End diff --
Thanks!
@cloud-fan Maybe it is good to add an example at here?
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