Re: PATCH: Batch/pipelining support for libpq

Here's a new version, where I've renamed everything to "pipeline". I
think the docs could use some additional tweaks now in order to make a
coherent story on pipeline mode, how it can be used in a batched
fashion, etc.

Here's the renames I applied. It's mostly mechanical, except
PQbatchSendQueue is now PQsendPipeline:

PQBatchStatus -> PGpipelineStatus (enum)
PQBATCH_MODE_OFF -> PQ_PIPELINE_OFF
PQBATCH_MODE_ON -> PQ_PIPELINE_ON
PQBATCH_MODE_ABORTED -> PQ_PIPELINE_ABORTED
PQbatchStatus -> PQpipelineStatus (function)
PQenterBatchMode -> PQenterPipelineMode
PQexitBatchMode -> PQexitPipelineMode
PQbatchSendQueue -> PQsendPipeline
PGRES_BATCH_END -> PGRES_PIPELINE_END
PGRES_BATCH_ABORTED -> PGRES_PIPELINE_ABORTED

Also, PQbatchStatus(conn) returns enum PGpipelineStatus (it previously
returned int).

I'm tempted to rename PGASYNC_QUEUED to PGASYNC_PIPELINE_IDLE (not sure
if PGASYNC_PIPELINE_READY fits better with the existing one).

In pgbench, I changed the metacommands to be \startpipeline and
\endpipeline. There's a failing Assert() there which I commented out;
needs fixed.

--
Álvaro Herrera 39°49'30"S 73°17'W