Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/3960#discussion_r22893043
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -50,8 +52,76 @@ private[hive] class HiveMetastoreCatalog(hive:
HiveContext) extends Catalog with
/** Connection to hive metastore. Usages should lock on `this`. */
protected[hive] val client = Hive.get(hive.hiveconf)
+ // TODO: Use this everywhere instead of tuples or databaseName,
tableName,.
+ /** A fully qualified identifier for a table (i.e., database.tableName)
*/
+ case class QualifiedTableName(database: String, name: String) {
+ def toLowerCase = QualifiedTableName(database.toLowerCase,
name.toLowerCase)
+ }
+
+ /** A cache of Spark SQL data source tables that have been accessed. */
+ protected[hive] val cachedDataSourceTables:
LoadingCache[QualifiedTableName, LogicalPlan] = {
+ val cacheLoader = new CacheLoader[QualifiedTableName, LogicalPlan]() {
+ override def load(in: QualifiedTableName): LogicalPlan = {
+ logDebug(s"Creating new cached data source for $in")
+ val table = client.getTable(in.database, in.name)
+ val schemaString = table.getProperty("spark.sql.sources.schema")
+ val userSpecifiedSchema =
+ if (schemaString == null) {
+ None
+ } else {
+ Some(DataType.fromJson(schemaString).asInstanceOf[StructType])
+ }
+ // It does not appear that the ql client for the metastore has a
way to enumerate all the
+ // SerDe properties directly...
+ val options =
table.getTTable.getSd.getSerdeInfo.getParameters.toMap
+
+ val resolvedRelation =
+ ResolvedDataSource(
+ hive,
+ userSpecifiedSchema,
+ table.getProperty("spark.sql.sources.provider"),
+ options)
+
+ LogicalRelation(resolvedRelation.relation)
+ }
+ }
+
+ CacheBuilder.newBuilder().maximumSize(1000).build(cacheLoader)
+ }
+
+ def refreshTable(databaseName: String, tableName: String): Unit = {
+ cachedDataSourceTables.refresh(QualifiedTableName(databaseName,
tableName).toLowerCase)
+ }
+
+ def invalidateTable(databaseName: String, tableName: String): Unit = {
--- End diff --
These should probably also take `tableIdentifiers`?
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