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docs/en/sql-reference/functions/array-join.md
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@ -79,8 +79,8 @@ GROUP BY
└─────────────┴──────────┴─────────┘ └─────────────┴──────────┴─────────┘
``` ```
### Important note! ### Important note!
Using multiple `arrayJoin` with same expression may not produce expected results due optimizations. Using multiple `arrayJoin` with same expression may not produce expected results due to optimizations.
For that cases, consider changing array expression that is repeated with extra operations that do not affect join result - e.g. `arrayJoin(arraySort(arr))`, `arrayJoin(arrayConcat(arr, []))` For that cases, consider modifying repeated array expression with extra operations that do not affect join result - e.g. `arrayJoin(arraySort(arr))`, `arrayJoin(arrayConcat(arr, []))`
Example: Example:
```sql ```sql