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Update hll-merge-function.md #2421

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3 changes: 3 additions & 0 deletions data-explorer/kusto/query/hll-merge-function.md
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Expand Up @@ -11,6 +11,9 @@ ms.date: 08/11/2024

Merges HLL results. This is the scalar version of the aggregate version [`hll_merge()`](hll-merge-aggregation-function.md).

> [!NOTE]
> You can't merge hll values that were created using different accuracy values. For more information, see [hll()](hll-aggregation-function.md).

Read about the [underlying algorithm (*H*yper*L*og*L*og) and estimation accuracy](#estimation-accuracy).

> [!IMPORTANT]
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