Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/14883#discussion_r77292196
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
---
@@ -184,4 +184,17 @@ abstract class ExternalCatalog {
def listFunctions(db: String, pattern: String): Seq[String]
+ //
--------------------------------------------------------------------------
+ // Resources
+ //
--------------------------------------------------------------------------
+
+ /**
+ * Add a JAR resource to the underlying external catalog for DDL (e.g.
CREATE TABLE) and DML
+ * (e.g., LOAD TABLE) operations.
+ *
+ * For example, when users create a Hive serde table, they can specify a
custom
+ * Serializer-Deserializer (SerDe) class. When Hive metastore is unable
to access the custom SerDe
+ * JAR (e.g., not on the Hive classpath), the JAR file must be added at
runtime using this API.
+ */
+ def addJar(path: String): Unit
--- End diff --
We still need an `addJar` API in the `ExternalCatalog` for passing it to
the underlying Hive metastore, even if we can specify jar in data source
options. Here, we are not storing the `Jar` info in the metastore. The Hive
metastore needs it for creating/loading the tables.
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