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7bb4923391
Fixed bug where the use of an :class:`.Alias` object in a column context would raise an argument error when it tried to group itself into a parenthesized expression. Using :class:`.Alias` in this way is not yet a fully supported API, however it applies to some end-user recipes and may have a more prominent role in support of some future Postgresql features. Change-Id: I81717e30416e0350f08d1e022c3d84656e0a9735 Fixes: #3939