ALTER TABLE ... MODIFY SAMPLE BY

View as MarkdownEdit this pageReport an issueSet up docs MCP

The following operations are available:

MODIFY

ALTER TABLE [db].name [ON CLUSTER cluster] MODIFY SAMPLE BY new_expression

The command changes the sampling key of the table to new_expression (an expression or a tuple of expressions). The primary key must contain the new sample key.

REMOVE

ALTER TABLE [db].name [ON CLUSTER cluster] REMOVE SAMPLE BY

The command removes the sampling key of the table.

The commands MODIFY and REMOVE are lightweight in the sense that they only change metadata or remove files.