aokolnychyi commented on code in PR #52876:
URL: https://github.com/apache/spark/pull/52876#discussion_r2529241034
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/RelationResolution.scala:
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@@ -225,6 +225,44 @@ class RelationResolution(override val catalogManager:
CatalogManager)
}
}
+ def resolveReference(ref: TableReference): LogicalPlan = {
+ val relation = getOrLoadRelation(ref)
+ val planId = ref.getTagValue(LogicalPlan.PLAN_ID_TAG)
+ cloneWithPlanId(relation, planId)
+ }
+
+ private def getOrLoadRelation(ref: TableReference): LogicalPlan = {
+ val key = toCacheKey(ref.catalog, ref.identifier)
+ relationCache.get(key) match {
+ case Some(cached) =>
+ adaptCachedRelation(cached, ref)
+ case None =>
+ val relation = loadRelation(ref)
+ relationCache.update(key, relation)
+ relation
+ }
+ }
+
+ private def loadRelation(ref: TableReference): LogicalPlan = {
+ val table = ref.catalog.loadTable(ref.identifier)
+ TableReferenceUtils.validateLoadedTable(table, ref)
+ val tableName = ref.identifier.toQualifiedNameParts(ref.catalog)
+ SubqueryAlias(tableName, ref.toRelation(table))
+ }
+
+ private def adaptCachedRelation(cached: LogicalPlan, ref: TableReference):
LogicalPlan = {
+ cached transform {
+ case r: DataSourceV2Relation if matchesReference(r, ref) =>
+ r.copy(output = ref.output, options = ref.options)
Review Comment:
Not sure I got the question. This code exists as the cached output
attributes may be different from the reference. This method replaces
`TableReference` (which is resolved and has its output) with a relation from
the cache but makes it use output and options from `TableReference`.
Does it make sense?
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