• Robert Haas's avatar
    Enable parallelism for prepared statements and extended query protocol. · 57a6a72b
    Robert Haas authored
    Parallel query can't handle running a query only partially rather than
    to completion.  However, there seems to be no way to run a statement
    prepared via SQL PREPARE other than to completion, so we can enable it
    there without a problem.
    
    The situation is more complicated for the extend query protocol.
    libpq seems to provide no way to send an Execute message with a
    non-zero rowcount, but some other client might.  If that happens, and
    a parallel plan was chosen, we'll execute the parallel plan without
    using any workers, which may be somewhat inefficient but should still
    work.  Hopefully this won't be a problem; users can always set
    max_parallel_degree=0 to avoid choosing parallel plans in the first
    place.
    
    Amit Kapila, reviewed by me.
    57a6a72b
postgres.c 117 KB