vvysotskyi commented on a change in pull request #2030: Update docs for Metastore to point that all format plugins are supported URL: https://github.com/apache/drill/pull/2030#discussion_r394981523
########## File path: _docs/sql-reference/sql-commands/021-create-schema.md ########## @@ -604,8 +608,32 @@ STATEMENT format displays the schema in a form compatible with the CREATE OR REP | +--------------------------------------------------------------------------+ +### Altering Schema for a Table +Table schema may be updated using the `ALTER SCHEMA` commands. + +The syntax for the command to add (or replace) columns / properties is the following: + + ALTER SCHEMA + (FOR TABLE dfs.tmp.nation | PATH '/tmp/schema.json') + ADD [OR REPLACE] + [COLUMNS (col1 int, col2 varchar)] + [PROPERTIES ('prop1'='val1', 'prop2'='val2')] + +Add command will fail if column or property with the same name exists, unless `OR REPLACE` keywords are indicated. +Add command will fail, if the schema file does not exist. + +The syntax for the command to remove columns / properties is the following: + + ALTER SCHEMA + (FOR TABLE dfs.tmp.nation | PATH '/tmp/schema.json') + REMOVE + [COLUMNS (col1 int, col2 varchar)] + [PROPERTIES ('prop1'='val1', 'prop2'='val2')] + +Remove command won't fail if the column or property does not exist but will fail if the schema file is absent. Review comment: Replaced. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services