A field selection expression. e.g. request.auth.
| Name | Type | Description | Notes |
|---|---|---|---|
| operand | Expr | [optional] | |
| field | String | Required. The name of the field to select. For example, in the select expression `request.auth`, the `auth` portion of the expression would be the `field`. | [optional] |
| testOnly | Boolean | Whether the select is to be interpreted as a field presence test. This results from the macro `has(request.auth)`. | [optional] |