yutoacts commented on a change in pull request #35239:
URL: https://github.com/apache/spark/pull/35239#discussion_r793553705
##########
File path: docs/sql-ref-syntax-ddl-alter-table.md
##########
@@ -75,6 +75,50 @@ ALTER TABLE table_identifier ADD COLUMNS ( col_spec [ , ...
] )
Specifies the columns to be added.
+### DROP COLUMNS
+
+`ALTER TABLE DROP COLUMNS` statement drops mentioned columns from an existing
table.
+Note that this statement is only supported with v2 tables.
+
+
+#### Syntax
+
+```sql
+ALTER TABLE table_identifier DROP COLUMNS ( col_name1, ... )
+```
Review comment:
It seems that `col_spec` is only used in this doc (for ADD COLUMN,
RENAME COLUMN and ALTER/CHANGE COLUMN), and I agree with you that `col_spec`
sounds misleading when only a name of a column is needed. I'll change all
`col_spec` in `col_name` except ones in ADD COLUMN (since ADD COLUMN needs data
type as well).
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