Count contrib/bloom index scans in pgstat view.
Maintain the pg_stat_user_indexes.idx_scan pgstat counter during
contrib/Bloom index scans.
Oversight in commit
9ee014fc, which added the Bloom index contrib
module.
Author: Masahiro Ikeda <ikedamsh@oss.nttdata.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/
c48839d881388ee401a01807c686004d@oss.nttdata.com
Backpatch: 13- (all supported branches).