[SPARK-20439][SQL] Fix Catalog API listTables and getTable when faile…

…d to fetch table metadata

### What changes were proposed in this pull request?

`spark.catalog.listTables` and `spark.catalog.getTable` does not work if we are unable to retrieve table metadata due to any reason (e.g., table serde class is not accessible or the table type is not accepted by Spark SQL). After this PR, the APIs still return the corresponding Table without the description and tableType)

### How was this patch tested?
Added a test case

Author: Xiao Li <gatorsmile@gmail.com>

Closes #17730 from gatorsmile/listTables.

sql/core/src/main/scala/org/apache/spark/sql/internal/CatalogImpl.scala

@@ -18,6 +18,7 @@
 package org.apache.spark.sql.internal
 
 import scala.reflect.runtime.universe.TypeTag
+import scala.util.control.NonFatal
 
 import org.apache.spark.annotation.Experimental
 import org.apache.spark.sql._
@@ -98,14 +99,27 @@ class CatalogImpl(sparkSession: SparkSession) extends Catalog {
     CatalogImpl.makeDataset(tables, sparkSession)
   }
 
+  /**
+   * Returns a Table for the given table/view or temporary view.
+   *
+   * Note that this function requires the table already exists in the Catalog.
+   *
+   * If the table metadata retrieval failed due to any reason (e.g., table serde class
+   * is not accessible or the table type is not accepted by Spark SQL), this function
+   * still returns the corresponding Table without the description and tableType)
+   */
   private def makeTable(tableIdent: TableIdentifier): Table = {
-    val metadata = sessionCatalog.getTempViewOrPermanentTableMetadata(tableIdent)
+    val metadata = try {
+      Some(sessionCatalog.getTempViewOrPermanentTableMetadata(tableIdent))
+    } catch {
+      case NonFatal(_) => None
+    }
     val isTemp = sessionCatalog.isTemporaryTable(tableIdent)
     new Table(
       name = tableIdent.table,
-      database = metadata.identifier.database.orNull,
-      description = metadata.comment.orNull,
-      tableType = if (isTemp) "TEMPORARY" else metadata.tableType.name,
+      database = metadata.map(_.identifier.database).getOrElse(tableIdent.database).orNull,
+      description = metadata.map(_.comment.orNull).orNull,
+      tableType = if (isTemp) "TEMPORARY" else metadata.map(_.tableType.name).orNull,
       isTemporary = isTemp)
   }
 
@@ -197,7 +211,11 @@ class CatalogImpl(sparkSession: SparkSession) extends Catalog {
    * `AnalysisException` when no `Table` can be found.
    */
   override def getTable(dbName: String, tableName: String): Table = {
-    makeTable(TableIdentifier(tableName, Option(dbName)))
+    if (tableExists(dbName, tableName)) {
+      makeTable(TableIdentifier(tableName, Option(dbName)))
+    } else {
+      throw new AnalysisException(s"Table or view '$tableName' not found in database '$dbName'")
+    }
   }
 
   /**

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveDDLSuite.scala

@@ -1197,6 +1197,14 @@ class HiveDDLSuite
           s"CREATE INDEX $indexName ON TABLE $tabName (a) AS 'COMPACT' WITH DEFERRED REBUILD")
         val indexTabName =
           spark.sessionState.catalog.listTables("default", s"*$indexName*").head.table
+
+        // Even if index tables exist, listTables and getTable APIs should still work
+        checkAnswer(
+          spark.catalog.listTables().toDF(),
+          Row(indexTabName, "default", null, null, false) ::
+            Row(tabName, "default", null, "MANAGED", false) :: Nil)
+        assert(spark.catalog.getTable("default", indexTabName).name === indexTabName)
+
         intercept[TableAlreadyExistsException] {
           sql(s"CREATE TABLE $indexTabName(b int)")
         }