What language does `-dataset-filter` use?

Please provide additional documentation about what language the `dataset-filter` switch uses i.e. KQL, OData, etc so we can know what expressions we can use.

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#### Document Details

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* ID: 23e59ee9-036f-374f-3029-747d94336052
* Version Independent ID: 3d0d61b6-99bc-327d-c549-7722ca230eb6
* Content: [az costmanagement](https://docs.microsoft.com/en-us/cli/azure/costmanagement?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/costmanagement.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/master/latest/docs-ref-autogen/costmanagement.yml)
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**