Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16514#discussion_r95287862
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -119,7 +119,31 @@ private[hive] class HiveMetastoreCatalog(sparkSession:
SparkSession) extends Log
qualifiedTableName.database, qualifiedTableName.name)
if (DDLUtils.isDatasourceTable(table)) {
- val dataSourceTable = cachedDataSourceTables(qualifiedTableName)
+ val dataSourceTable =
+ cachedDataSourceTables(qualifiedTableName) match {
+ case l @ LogicalRelation(relation: HadoopFsRelation, _, _) =>
+ val location = table.storage.locationUri
+ val cachedLocation = relation.location.rootPaths
+ val isSamePath = location.isDefined && cachedLocation.size ==
1 &&
--- End diff --
The size of `cachedLocation` is always 1, because we rely on
[resolveRelation](https://github.com/gatorsmile/spark/blob/f6b88e6595271dbd6c868f7e220ba480872e1a9f/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala#L88)
to build the cached LogicalRelation.
In the resolveRelation, the [rootPaths is always pointing to a single
file](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala#L368).
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