Github user mallman commented on a diff in the pull request:
https://github.com/apache/spark/pull/16514#discussion_r95489960
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -119,7 +119,30 @@ 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, _, _) =>
+ // Ignore the scheme difference when comparing the paths
+ val isSamePath =
+ table.storage.locationUri.isDefined &&
relation.location.rootPaths.size == 1 &&
+ table.storage.locationUri.get ==
relation.location.rootPaths.head.toUri.getPath
+ // If we have the same paths, same schema, and same partition
spec,
+ // we will use the cached relation.
+ val useCached =
+ isSamePath &&
+ l.schema == table.schema &&
+ relation.bucketSpec == table.bucketSpec &&
+ relation.partitionSchema == table.partitionSchema
+ if (useCached) {
+ l
+ } else {
+ // If the cached relation is not updated, we invalidate it
right away.
+ cachedDataSourceTables.invalidate(qualifiedTableName)
+ // Reload it from the external catalog
+ cachedDataSourceTables(qualifiedTableName)
+ }
+ case o => o
+ }
--- End diff --
Understood.
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