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docs: fix parallel_view_processing example to use INSERT SELECT #6391

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docs: fix parallel_view_processing example to use INSERT SELECT #6391

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6 changes: 5 additions & 1 deletion docs/materialized-view/incremental-materialized-view.md
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Expand Up @@ -1115,13 +1115,17 @@ ORDER BY uuid ASC
3 rows in set. Elapsed: 0.004 sec.
```

:::note
As of ClickHouse v25.5, `parallel_view_processing` only applies to `INSERT ... SELECT` queries. Use `INSERT ... SELECT` to demonstrate parallel view processing as shown below.
:::

Conversely, consider what happens if we insert a row with `parallel_view_processing=1` enabled. With this enabled, the views are executed in parallel, giving no guarantees to the order at which rows arrive to the target table:

```sql
TRUNCATE target;
SET parallel_view_processing = 1;

INSERT INTO source VALUES ('test');
INSERT INTO source SELECT 'test';
```

```response
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