# Union without ALL

### Condition

Query in `RUNNING` status contains `UNION` instead of `UNION ALL`, and it aggregates a large number of rows. 

### How to fix

* Use `UNION ALL` instead of `UNION`. If you actually need de-duplication, consider using `GROUP BY` or `DISTINCT` on sub-query with multiple tables combined by `UNION ALL`.
* Process data in smaller chunks.

### Example

```
    UnionWithoutAllCondition(
        min_input_rows=10_000_000,  # at least 10M input rows for UNION without ALL
        notice_duration=60 * 10,  # 10 minutes for notice
    ),
```

### Specific arguments

* **min\_input\_rows** (int) - how many rows should go into `Aggregate` node caused by `UNION` (recommended min value is at least 1M to prevent false positives)


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