pgstattuple: Optimize pgstattuple_approx() with streaming read This commit plugs into pgstattuple_approx(), the SQL function faster than pgstattuple() that returns approximate results, the streaming read APIs. A callback is used to be able to skip all-visible pages via VM lookup, to match with the logic prior to this commit.
Under test conditions similar to 6c228755add8 (some dm_delay and debug_io_direct=data), this can substantially improve the execution time of the function, particularly for large relations. Author: Xuneng Zhou <[email protected]> Reviewed-by: Michael Paquier <[email protected]> Reviewed-by: Nazir Bilal Yavuz <[email protected]> Discussion: https://postgr.es/m/CABPTF7VrqfbcDXqGrdLQ2xaQ=k0rzexnuw6u_ggqzsju32w...@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/ae58189a4d523f0156ebe30f4534180555669e88 Modified Files -------------- contrib/pgstattuple/pgstatapprox.c | 127 ++++++++++++++++++++++++++++--------- src/tools/pgindent/typedefs.list | 1 + 2 files changed, 97 insertions(+), 31 deletions(-)
