Re: Streaming I/O, vectored I/O (WIP)

[Thomas Munro]

Small bug fix: the condition in the final test at the end of
read_stream_look_ahead() wasn't quite right.  In general when looking
ahead, we don't need to start a read just because the pending read
would bring us up to stream->distance if submitted now (we'd prefer to
build it all the way up to size io_combine_limit if we can), but if
that condition is met AND we have nothing pinned yet, then there is no
chance for the read to grow bigger by a pinned buffer being consumed.
Fixed, comment updated.

v12-0001-Provide-vectored-variant-of-ReadBuffer.patch
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v12-0002-Provide-API-for-streaming-relation-data.patch

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v12-0003-Use-streaming-I-O-in-pg_prewarm.patch

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