From 320276b245e956f4afea609738d27cc49b69d6d7 Mon Sep 17 00:00:00 2001 From: "urishapira@microsoft.com" Date: Wed, 11 Feb 2026 13:43:31 +0200 Subject: [PATCH] additions --- .../alter-merge-query-acceleration-policy-command.md | 5 +---- .../management/alter-query-acceleration-policy-command.md | 2 +- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/data-explorer/kusto/management/alter-merge-query-acceleration-policy-command.md b/data-explorer/kusto/management/alter-merge-query-acceleration-policy-command.md index 910c43ffa5..c870056d5a 100644 --- a/data-explorer/kusto/management/alter-merge-query-acceleration-policy-command.md +++ b/data-explorer/kusto/management/alter-merge-query-acceleration-policy-command.md @@ -41,10 +41,7 @@ You must have at least [Database Admin](../access-control/role-based-access-cont | Hot | `Timespan` | | The hot period defined in the query acceleration policy. Minimum value = 1 d. This property is required if no query acceleration policy is defined on the external table. | | HotWindows | `DateTime` | | One or more optional time windows. Delta data files created within these time windows are accelerated. | | MaxAge | `Timespan` | | The external table returns accelerated data if the last index refresh time is greater than @now - MaxAge. Otherwise, external table operates in nonaccelerated mode. Default is 5 minutes. Minimum is 1 minute. | -| HotDateTimeColumn | `String` | | The name of a datetime column in the Delta table whose values will be used to determine hot-cache eligibility. When set, data files whose rows have values within the configured Hot period (and/or HotWindows) are selected for caching. | - -> [!NOTE] -> Query acceleration is applied to data within a specific time period, defined as `timespan`, starting from the `modificationTime` as stated for each file in the [delta log](https://github.com/delta-io/delta/blob/master/PROTOCOL.md#add-file-and-remove-file). +| HotDateTimeColumn | `String` | | Name of a datetime column used to determine hot-cache eligibility. A data file will be cached if its min/max stats for this column are within the configured Hot period and/or HotWindows. If not specified, eligibility is determined using the file modificationTime. Eligibility is computed using [delta log](https://github.com/delta-io/delta/blob/master/PROTOCOL.md#add-file-and-remove-file) metadata only - setting this property does not add query-time overhead| ### Example diff --git a/data-explorer/kusto/management/alter-query-acceleration-policy-command.md b/data-explorer/kusto/management/alter-query-acceleration-policy-command.md index 7549cc4ccc..00c4453610 100644 --- a/data-explorer/kusto/management/alter-query-acceleration-policy-command.md +++ b/data-explorer/kusto/management/alter-query-acceleration-policy-command.md @@ -39,7 +39,7 @@ You must have at least [Database Admin](../access-control/role-based-access-cont | Hot | `Timespan` | :heavy_check_mark: | The hot period defined in the query acceleration policy. Minimum value = 1 d. | | HotWindows | `DateTime` | | One or more optional time windows. Delta data files created within these time windows are accelerated. | | MaxAge | `Timespan` | | The external table returns accelerated data if the last index refresh time is greater than @now - MaxAge. Otherwise, the external table operates in non-accelerated mode. Default is 5 minutes. Minimum is 1 minute. This property can also be overridden at query time by using the [`external_table()` function's](../query/external-table-function.md) `MaxAgeOverride` parameter. | -| HotDateTimeColumn | `String` | | Optional. The name of a datetime column in the Delta table whose values will be used to determine hot-cache eligibility. When set, data files whose rows have values within the configured Hot period (and/or HotWindows) are selected for caching. | +| HotDateTimeColumn | `String` | | The Name of a datetime column used to determine hot-cache eligibility. A data file will be cached if its min/max stats for this column are within the configured Hot period and/or HotWindows. If not specified, eligibility is determined using the file modificationTime. Eligibility is computed using [delta log](https://github.com/delta-io/delta/blob/master/PROTOCOL.md#add-file-and-remove-file) metadata only - setting this property does not add query-time overhead | ::: moniker-end