Hi.
I've updated patches for asynchronous merge append. They allowed us to
significantly improve performance in practice. Earlier select from
partitioned (and distributed table) could switch to synchronous merge
append plan from asynchronous append. Given that table could have 20+
partitions, it was cheaper, but much less efficient due to remote parts
executing synchronously.
In this version there's a couple of small fixes - earlier
ExecMergeAppend() scanned all asyncplans, but should do this only for
valid asyncplans. Also incorporated logic from
commit af717317a04f5217728ce296edf4a581eb7e6ea0
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Wed Mar 12 20:53:09 2025 +0200
Handle interrupts while waiting on Append's async subplans
into ExecMergeAppendAsyncEventWait().
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Best regards,
Alexander Pyhalov,
Postgres Professional