Apply mask of deleted rows

sql

ALTER TABLE [db].name [ON CLUSTER cluster] APPLY DELETED MASK [IN PARTITION partition_id]

The command applies mask created by lightweight delete and forcefully removes rows marked as deleted from disk. This command is a heavyweight mutation, and it semantically equals to query ALTER TABLE [db].name DELETE WHERE _row_exists = 0.

:::note It only works for tables in the MergeTree family (including replicated tables). :::

See also

Lightweight deletes
Heavyweight deletes