Re: COPY Transform support

Tom Lane wrote:
> Andrew Dunstan <andrew@dunslane.net> writes:
>   
>> Could we make each COPY target 
>> behave like an SRF, stashing its data in a tuplestore?
>>     
>
> The first question is what is the wire-protocol definition.  In
> particular, how would the client know what order to send the COPY
> datasets in, if a single query might include multiple COPY FROM STDIN
> segments?
>
> Another point is that we surely don't want the implementation to force
> use of a tuplestore all the time, so I'm not sure I buy that we can
> prevent interleaving of multiple datasets on the wire that way.
>
>             
>   

Is there a big demand for multiple datasets on the wire in a situation 
like this? How about if we allow multiple COPY targets but at most one 
from STDIN, at least for one go round?

cheers

andrew