[clickhouse][server][ddl] add fetch part docs

docs/en/sql-reference/statements/alter/partition.md

@@ -16,7 +16,7 @@ The following operations with [partitions](../../../engines/table-engines/merget
 -   [CLEAR COLUMN IN PARTITION](#alter_clear-column-partition) — Resets the value of a specified column in a partition.
 -   [CLEAR INDEX IN PARTITION](#alter_clear-index-partition) — Resets the specified secondary index in a partition.
 -   [FREEZE PARTITION](#alter_freeze-partition) — Creates a backup of a partition.
--   [FETCH PARTITION](#alter_fetch-partition) — Downloads a partition from another server.
+-   [FETCH PART\|PARTITION](#alter_fetch-partition) — Downloads a part or partition from another server.
 -   [MOVE PARTITION\|PART](#alter_move-partition) — Move partition/data part to another disk or volume.
 
 <!-- -->
@@ -198,29 +198,35 @@ ALTER TABLE table_name CLEAR INDEX index_name IN PARTITION partition_expr
 
 The query works similar to `CLEAR COLUMN`, but it resets an index instead of a column data.
 
-## FETCH PARTITION {#alter_fetch-partition}
+## FETCH PART|PARTITION {#alter_fetch-partition}
 
 ``` sql
-ALTER TABLE table_name FETCH PARTITION partition_expr FROM 'path-in-zookeeper'
+ALTER TABLE table_name FETCH PART|PARTITION partition_expr FROM 'path-in-zookeeper'
 ```
 
 Downloads a partition from another server. This query only works for the replicated tables.
 
 The query does the following:
 
-1.  Downloads the partition from the specified shard. In ‘path-in-zookeeper’ you must specify a path to the shard in ZooKeeper.
+1.  Downloads the partition|part from the specified shard. In ‘path-in-zookeeper’ you must specify a path to the shard in ZooKeeper.
 2.  Then the query puts the downloaded data to the `detached` directory of the `table_name` table. Use the [ATTACH PARTITION\|PART](#alter_attach-partition) query to add the data to the table.
 
 For example:
 
+1. FETCH PARTITION
 ``` sql
 ALTER TABLE users FETCH PARTITION 201902 FROM '/clickhouse/tables/01-01/visits';
 ALTER TABLE users ATTACH PARTITION 201902;
 ```
+2. FETCH PART
+``` sql
+ALTER TABLE users FETCH PART 201901_2_2_0 FROM '/clickhouse/tables/01-01/visits';
+ALTER TABLE users ATTACH PART 201901_2_2_0;
+```
 
 Note that:
 
--   The `ALTER ... FETCH PARTITION` query isn’t replicated. It places the partition to the `detached` directory only on the local server.
+-   The `ALTER ... FETCH PART|PARTITION` query isn’t replicated. It places the part or partition to the `detached` directory only on the local server.
 -   The `ALTER TABLE ... ATTACH` query is replicated. It adds the data to all replicas. The data is added to one of the replicas from the `detached` directory, and to the others - from neighboring replicas.
 
 Before downloading, the system checks if the partition exists and the table structure matches. The most appropriate replica is selected automatically from the healthy replicas.

docs/en/sql-reference/statements/grant.md

@@ -279,7 +279,7 @@ Allows executing [ALTER](../../sql-reference/statements/alter/index.md) queries
         -   `ALTER MATERIALIZE TTL`. Level: `TABLE`. Aliases: `MATERIALIZE TTL`
         -   `ALTER SETTINGS`. Level: `TABLE`. Aliases: `ALTER SETTING`, `ALTER MODIFY SETTING`, `MODIFY SETTING`
         -   `ALTER MOVE PARTITION`. Level: `TABLE`. Aliases: `ALTER MOVE PART`, `MOVE PARTITION`, `MOVE PART`
-        -   `ALTER FETCH PARTITION`. Level: `TABLE`. Aliases: `FETCH PARTITION`
+        -   `ALTER FETCH PARTITION`. Level: `TABLE`. Aliases: `FETCH PARTITION`, `FETCH PART`
         -   `ALTER FREEZE PARTITION`. Level: `TABLE`. Aliases: `FREEZE PARTITION`
     -   `ALTER VIEW` Level: `GROUP`
         -   `ALTER VIEW REFRESH`. Level: `VIEW`. Aliases: `ALTER LIVE VIEW REFRESH`, `REFRESH VIEW`

website/blog/en/2016/how-to-update-data-in-clickhouse.md

@@ -67,7 +67,7 @@ There is a nice set of operations to work with partitions:
 -   `DROP PARTITION` - Delete a partition.
 -   `ATTACH PART|PARTITION` -- Add a new part or partition from the 'detached' directory to the table.
 -   `FREEZE PARTITION` - Create a backup of a partition.
--   `FETCH PARTITION` - Download a partition from another server.
+-   `FETCH PART|PARTITION` - Download a part or partition from another server.
 
 We can do any data management operations on partitions level: move, copy and delete. Also, special DETACH and ATTACH operations are created to simplify data manipulation. DETACH detaches partition from table, moving all data to detached directory. Data is still there and you can copy it anywhere but detached data is not visible on request level. ATTACH is the opposite: attaches data from detached directory so it become visible.