cloud-fan commented on a change in pull request #28852:
URL: https://github.com/apache/spark/pull/28852#discussion_r456214684
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
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@@ -135,7 +136,16 @@ class SessionCatalog(
private val tableRelationCache: Cache[QualifiedTableName, LogicalPlan] = {
Review comment:
For external data sources, it's common that data are changed outside of
Spark. I think it's more important to make sure we get the latest data in a new
query. Maybe we should disable this relation cache by default.
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