Represents a Retail Filter.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/common/criteria.proto)

| Fields ||
|---|---|
| ## `node` Union field. Type of the retail filter node. `node` can be only one of the following: ||
| ### `expression` | `https://developers.google.com/google-ads/api/reference/rpc/v26/RetailFilterExpression` An expression node. At this time, this can only be an OR node. |
| ### `tag` | `https://developers.google.com/google-ads/api/reference/rpc/v26/RetailTag` A tag node. |