Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/16626#discussion_r106621736 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala --- @@ -175,6 +178,98 @@ 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 = verifyAlterTableAddColumn(catalog, table) + + try { + sparkSession.catalog.uncacheTable(table.quotedString) + } catch { + case NonFatal(e) => + log.warn(s"Exception when attempting to uncache table ${table.quotedString}", e) + } + + // Invalidate the table last, otherwise uncaching the table would load the logical plan + // back into the hive metastore cache + catalog.refreshTable(table) + val partitionFields = catalogTable.schema.takeRight(catalogTable.partitionColumnNames.length) --- End diff -- `catalog.partitionSchema`
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