Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/16626#discussion_r99680917 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala --- @@ -168,6 +168,43 @@ case class AlterTableRenameCommand( } /** + * A command that add columns to a table + * The syntax of using this command in SQL is: + * {{{ + * ALTER TABLE table_identifier + * ADD COLUMNS (col_name data_type [COMMENT col_comment], ...); + * }}} +*/ +case class AlterTableAddColumnsCommand( + table: TableIdentifier, + columns: Seq[StructField]) extends RunnableCommand { + override def run(sparkSession: SparkSession): Seq[Row] = { + val catalog = sparkSession.sessionState.catalog + val catalogTable = DDLUtils.verifyAlterTableAddColumn(catalog, table) + + // If an exception is thrown here we can just assume the table is uncached; + // this can happen with Hive tables when the underlying catalog is in-memory. + val wasCached = Try(sparkSession.catalog.isCached(table.unquotedString)).getOrElse(false) --- End diff -- The current way is right. The implementation should not rely on the internal behavior of another function.
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