on_cluster clause in optimize table query throws syntax error

[iamtalhaasghar]

fixes following bug:

2026.03.25 12:16:28.382791 [ 1224350 ] {7265776f-53f7-4feb-9ea7-f4f9e0ac4cbc} <Error> DynamicQueryHandler: Code: 62. DB::Exception: Syntax error: failed at position 51 (ON): ON CLUSTER {redacted} SETTINGS mutations_sync = 2. Expected one of: DEDUPLICATE, CLEANUP, INTO OUTFILE, FORMAT, SETTINGS, ParallelWithClause, PARALLEL WITH, end of query. (SYNTAX_ERROR)

Wrong:
optimize table db.table_name final on cluster cluster_name settings {....}

Correct:
optimize table db.table_name final settings {....}

Have also added alter_sync=2 to tell clickhouse client to wait for optimize query to successfully complete on replica nodes as well.

https://clickhouse.com/docs/sql-reference/statements/optimize

When OPTIMIZE is used with the ReplicatedMergeTree family of table engines, ClickHouse creates a task for merging and waits for execution on all replicas (if the alter_sync setting is set to 2)

https://clickhouse.com/docs/operations/settings/settings#alter_sync

Allows you to specify the wait behavior for actions that are to be executed on replicas by ALTER, OPTIMIZE or TRUNCATE queries.

Possible values:

0 — Do not wait.
1 — Wait for own execution.
2 — Wait for everyone.
3 - Only wait for active replicas.

Cloud default value: 0.