cloud-fan commented on a change in pull request #26589: [SPARK-29947][SQL]
Improve ResolveRelations performance
URL: https://github.com/apache/spark/pull/26589#discussion_r362441777
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -91,10 +91,14 @@ object FakeV2SessionCatalog extends TableCatalog {
* current catalog database.
* @param nestedViewDepth The nested depth in the view resolution, this
enables us to limit the
* depth of nested views.
+ * @param relationToLogicalPlanMaps The UnresolvedRelation to LogicalPlan
mapping, this can ensure
+ * that the table is resolved only once if a
table is used
+ * multiple times in a query.
*/
case class AnalysisContext(
defaultDatabase: Option[String] = None,
- nestedViewDepth: Int = 0)
+ nestedViewDepth: Int = 0,
+ relationToLogicalPlanMaps: mutable.Map[UnresolvedRelation, LogicalPlan] =
mutable.Map.empty)
Review comment:
and it's simpler to use `Seq[String]` as key.
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