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learn-build-service-prod merged 4 commits into from
Sep 22, 2025
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Repo sync for protected branch #2740

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70b46cc
Update mv-apply example
Sep 22, 2025
4a967c1
Merge pull request #7123 from dyadav7/user/deepyadav/mv_apply_with_ex…
prmerger-automator[bot] Sep 22, 2025
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Merge pull request #7124 from MicrosoftDocs/main
learn-build-service-prod[bot] Sep 22, 2025
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Merging changes synced from https://github.com/MicrosoftDocs/dataexpl…
Sep 22, 2025
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34 changes: 17 additions & 17 deletions data-explorer/kusto/query/mv-apply-operator.md
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Expand Up @@ -217,34 +217,34 @@ datatable (Val:int, Arr1:dynamic, Arr2:dynamic)

### Using `with_itemindex` for working with a subset of the array

The query results in a table with rows where the index is 3 or greater, including the index and element values from the original lists of even and odd numbers.
The query results in a table with rows where the index is 2 or greater, including the index and element values from the original lists.

:::moniker range="azure-data-explorer"
> [!div class="nextstepaction"]
> <a href="https://dataexplorer.azure.com/clusters/help/databases/Samples?query=H4sIAAAAAAAAAzVOS27CMBDd5xRvU5FIRRC6rMwNOENkkoG4tT2WMyEJ4vCEQcziLeZ9PQmazoqFKbBetvFKmHHJHFBDGPUeg1BCrfwDwxiCze5O8CbYf2q8G6ScK5wXzCfuDjCr/wuH30KDiwfCbWtT8gsmJ33jhIKLHc1GEeQpUBTjX22yJOJL6TleK3CElpaKux16yoSFR/T2Rtiof4OW/RiiaiZVvHOPBj/6rNYJKfMftfKmvj+dT34iokT+AAAA" target="_blank">Run the query</a>
> <a href="https://dataexplorer.azure.com/clusters/help/databases/Samples?query=H4sIAAAAAAAAA02N2wrCMBBE3%2FMV89YGIrVeUCoV%2FI5SJLarDeRSStpa8OONEcF92IWZ2TmaPFrpJcp4vLxpQjq4uYCyXuAyDAXaxUqjGs4qhjBr8VPSai%2BQC2xrLqKV%2F1m7YIXoUeBQc1af2AfAXjDTSva9XjAr312VJ6NsS88ybkxSj1QGLLyDX3py91Q7%2B%2BBwFoGRRk6WoaOBsLgRnZwISfxO0Dg9Ghszc0x8W88lNkHkb%2BM%2FJCbvAAAA" target="_blank">Run the query</a>
::: moniker-end

```kusto
let _data =
range x from 1 to 10 step 1
| summarize l=make_list(x) by xMod2 = x % 2;
_data
| mv-apply with_itemindex=index element=l to typeof(long) on
(
let data = datatable (row: int, Arr: dynamic)
[
0, dynamic([5, 1, 3]),
1, dynamic([4, 10, 8, 7])
];
data
| mv-apply with_itemindex=index value=Arr to typeof(long) on
(
// here you have 'index' column
where index >= 3
)
| project index, element
where index >= 2
)
```

**Output**

| index | element |
|--|--|
| 3 | 7 |
| 4 | 9 |
| 3 | 8 |
| 4 | 10 |
| row | Arr | value | index |
|--|--|--|--|
| 0 | [5, 1, 3] | 3 | 2 |
| 1 | [4, 10, 8, 7] | 8 | 2 |
| 1 | [4, 10, 8, 7] | 7 | 3 |

### Using multiple columns to join element of two arrays

Expand Down