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Improve regression test coverage of GiST index building.
Add a test case that exercises the "buffering build" code path. This covers almost all the non-error-case lines in gistbuild.c and gistbuildbuffers.c. Matheus Alcantara, based on earlier work by Pavel Borisov Discussion: https://postgr.es/m/3z8Fde-IHbW57a7bEZtaf19f4YOCWu67IZoWJoGW18rKD9R16ZHHchf4d7KFI3Yg7-0N4NonFuwKEgh98HjMCZYoVx7KOioPo6Wn2nZRpf4=@pm.me
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@ -387,6 +387,9 @@ select p from gist_tbl order by circle(p,1) <-> point(0,0) limit 1;
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select p from gist_tbl order by circle(p,1) <-> point(0,0) limit 1;
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ERROR: lossy distance functions are not supported in index-only scans
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-- Force an index build using buffering.
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create index gist_tbl_box_index_forcing_buffering on gist_tbl using gist (p)
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with (buffering=on, fillfactor=50);
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-- Clean up
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reset enable_seqscan;
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reset enable_bitmapscan;
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@ -169,6 +169,10 @@ explain (verbose, costs off)
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select p from gist_tbl order by circle(p,1) <-> point(0,0) limit 1;
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select p from gist_tbl order by circle(p,1) <-> point(0,0) limit 1;
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-- Force an index build using buffering.
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create index gist_tbl_box_index_forcing_buffering on gist_tbl using gist (p)
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with (buffering=on, fillfactor=50);
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-- Clean up
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reset enable_seqscan;
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reset enable_bitmapscan;
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