Avoid negative generation in dictionary proxy. There is no strong reason to create a proxy with a negative generation anyway. Non-zero generation on a proxy creation would allow us later to stop using negative indices for transient strings. Non-negative indices would allow deep nesting and let us treat proxy-encoded columns as regular dictionary-encoded columns.
Avoid negative generation in dictionary proxy. There is no strong reason to create a proxy with a negative generation anyway. Non-zero generation on a proxy creation would allow us later to stop using negative indices for transient strings. Non-negative indices would allow deep nesting and let us treat proxy-encoded columns as regular dictionary-encoded columns.