[Sqlalchemy-tickets] [sqlalchemy] #2866: create kwarg registration system for dialect kwargs, build into _valdidate_dialect_kwargs

[sqlalchemy <mi...@zz...>]

#2866: create kwarg registration system for dialect kwargs, build into
_valdidate_dialect_kwargs
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 Reporter:  zzzeek  |           Owner:  zzzeek
     Type:  defect  |          Status:  new
 Priority:  medium  |       Milestone:  0.9.xx
Component:  schema  |        Severity:  major - 1-3 hours
 Keywords:          |  Progress State:  in queue
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 so that operations like Index(..., postresql_where=...) as well as args
 not known "postgresql_imfake" can raise an error.    To handle entrypoint
 dialects, the system would actually need to resolve an entrypoint upon
 receipt of an unregistered dialect name as a kwarg.

 for an error against "postresql_where", it would be like, "Can't locate
 any dialect named 'postresql'" after it searched entrypoints.

 for an error against "postgresql_imfake", the Postgresql dialect itself
 would have registered all available kwargs such as "postgresql_where" and
 such, and the error can say "no dialect option postgresql_imfake
 registered for the postgresql dialect".

 also Index needs _validate_dialect_kwargs added.

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2866>
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