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Michael Paquier
f10a43b2c2
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 b351cef7df (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_GGqzSJu32wfdQ@mail.gmail.com