gengliangwang commented on a change in pull request #24768: [SPARK-27919][SQL]
Add v2 session catalog
URL: https://github.com/apache/spark/pull/24768#discussion_r296439683
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalog/v2/LookupCatalog.scala
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@@ -17,54 +17,127 @@
package org.apache.spark.sql.catalog.v2
+import scala.util.control.NonFatal
+
import org.apache.spark.annotation.Experimental
+import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.TableIdentifier
/**
* A trait to encapsulate catalog lookup function and helpful extractors.
*/
@Experimental
-trait LookupCatalog {
+trait LookupCatalog extends Logging {
+
+ import LookupCatalog._
+ protected def defaultCatalogName: Option[String] = None
protected def lookupCatalog(name: String): CatalogPlugin
- type CatalogObjectIdentifier = (Option[CatalogPlugin], Identifier)
+ /**
+ * Returns the default catalog. When set, this catalog is used for all
identifiers that do not
+ * set a specific catalog. When this is None, the session catalog is
responsible for the
+ * identifier.
+ *
+ * If this is None and a table's provider (source) is a v2 provider, the v2
session catalog will
+ * be used.
+ */
+ def defaultCatalog: Option[CatalogPlugin] = {
+ try {
+ defaultCatalogName.map(lookupCatalog)
+ } catch {
+ case NonFatal(e) =>
+ logError(s"Cannot load default v2 catalog: ${defaultCatalogName.get}",
e)
+ None
+ }
+ }
/**
- * Extract catalog plugin and identifier from a multi-part identifier.
+ * This catalog is a v2 catalog that delegates to the v1 session catalog. it
is used when the
+ * session catalog is responsible for an identifier, but the source requires
the v2 catalog API.
+ * this happens when the source implementation extends the v2 TableProvider
API and is not listed
Review comment:
Nit: capitalize "this"
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