postgresql

mirror of https://git.postgresql.org/git/postgresql.git synced 2025-03-25 20:10:41 +08:00

History

Heikki Linnakangas 65014000b3 Replace polyphase merge algorithm with a simple balanced k-way merge.

The advantage of polyphase merge is that it can reuse the input tapes as
output tapes efficiently, but that is irrelevant on modern hardware, when
we can easily emulate any number of tape drives. The number of input tapes
we can/should use during merging is limited by work_mem, but output tapes
that we are not currently writing to only cost a little bit of memory, so
there is no need to skimp on them.

This makes sorts that need multiple merge passes faster.

Discussion: https://www.postgresql.org/message-id/420a0ec7-602c-d406-1e75-1ef7ddc58d83%40iki.fi
Reviewed-by: Peter Geoghegan, Zhihong Yu, John Naylor

2021-10-18 14:46:01 +03:00

backend

Replace polyphase merge algorithm with a simple balanced k-way merge.

2021-10-18 14:46:01 +03:00

bin

Fix portability issues in new TAP tests of psql

2021-10-18 09:51:21 +09:00

common

Fix memory leak in pg_hmac

2021-10-01 22:47:05 +02:00

fe_utils

Skip trailing whitespaces when parsing integer options