Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16373#discussion_r105586710
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala ---
    @@ -642,18 +644,34 @@ case class ShowTablesCommand(
         // instead of calling tables in sparkSession.
         val catalog = sparkSession.sessionState.catalog
         val db = databaseName.getOrElse(catalog.getCurrentDatabase)
    -    val tables =
    -      tableIdentifierPattern.map(catalog.listTables(db, 
_)).getOrElse(catalog.listTables(db))
    -    tables.map { tableIdent =>
    -      val database = tableIdent.database.getOrElse("")
    -      val tableName = tableIdent.table
    -      val isTemp = catalog.isTemporaryTable(tableIdent)
    -      if (isExtended) {
    -        val information = 
catalog.getTempViewOrPermanentTableMetadata(tableIdent).toString
    -        Row(database, tableName, isTemp, s"${information}\n")
    -      } else {
    -        Row(database, tableName, isTemp)
    +    if (partitionSpec.isEmpty) {
    +      // Show the information of tables.
    +      val tables =
    +        tableIdentifierPattern.map(catalog.listTables(db, 
_)).getOrElse(catalog.listTables(db))
    +      tables.map { tableIdent =>
    +        val database = tableIdent.database.getOrElse("")
    --- End diff --
    
    shall we get the current database?


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