psqlodbc communication over protocol

Hi All,

Going through the codebase of psqlodbc-8.2.003, I
found that psqlodbc is no more using libpq calls for
communcation with postgres server e.g PQexec for
executing simple quries,But now psqlodbc is using
socket for communication over the protocol,I wanted
you check if i can know is there any specific reason
for this other then performace gain.if i am getting it
right?

Thanks,
Zahid K.

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