cloud-fan commented on a change in pull request #26071: [SPARK-29412][SQL] 
refine the document of v2 session catalog config
URL: https://github.com/apache/spark/pull/26071#discussion_r333302564
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
 ##########
 @@ -1976,11 +1977,19 @@ object SQLConf {
     .stringConf
     .createOptional
 
-  val V2_SESSION_CATALOG = buildConf("spark.sql.catalog.session")
-      .doc("A catalog implementation that will be used in place of the Spark 
built-in session " +
-        "catalog for v2 operations. The implementation may extend 
`CatalogExtension` to be " +
-        "passed the Spark built-in session catalog, so that it may delegate 
calls to the " +
-        "built-in session catalog.")
+  val V2_SESSION_CATALOG_IMPLEMENTATION =
+    buildConf(s"spark.sql.catalog.${CatalogManager.SESSION_CATALOG_NAME}")
+      .doc("A catalog implementation that will be used in place of the Spark 
Catalog for v2 " +
+        "operations (e.g. create table using a v2 source, alter a v2 table). 
The Spark Catalog " +
+        "is the current catalog by default, and supports all kinds of catalog 
operations like " +
+        "CREATE TABLE USING v1/v2 source, VIEW/FUNCTION related operations, 
etc. This config is " +
+        "used to extend the Spark Catalog and inject custom logic to v2 
operations, while other" +
+        "operations still go through the Spark Catalog. The catalog 
implementation specified " +
+        "by this config should extend `CatalogExtension` to be passed the 
Spark Catalog, " +
+        "so that it can delegate calls to Spark Catalog. Otherwise, the 
implementation " +
+        "should figure out a way to access the Spark Catalog or its underlying 
meta-store " +
+        "by itself. It's important to make the implementation share the 
underlying meta-store " +
+        "of the Spark Catalog and act as an extension, instead of a separated 
catalog.")
 
 Review comment:
   thanks for the suggestion!

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