Update backfill_column.md

content/en/altinity-kb-schema-design/backfill_column.md

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 Sometimes you need to add a column into a huge table and backfill it with a data from another source, without reingesting all data.
 
 
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 In case of a replicated / sharded setup you need to have the dictionary and source table (dict_table / item_dict) on all nodes and they have to all have EXACTLY the same data. The easiest way to do this is to make dict_table replicated.
 
 In this case, you will need to set the setting `allow_nondeterministic_mutations=1` on the user that runs the `ALTER TABLE`. See the [ClickHouse docs](https://clickhouse.com/docs/en/operations/settings/settings#allow_nondeterministic_mutations) for more information about this setting.