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.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
