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Restore handling of -0 in the C field of lines in line_construct().

author Tomas Vondra <tomas.vondra@postgresql.org>

2018年7月29日 18:35:18 +0000 (20:35 +0200)

committer Tomas Vondra <tomas.vondra@postgresql.org>

2018年7月29日 19:11:05 +0000 (21:11 +0200)

Commit a7dc63d904 inadvertedly removed this bit originally introduced
by 43fe90f66a, causing regression test failures on some platforms,
due to producing {1,-1,-0} instead of {1,-1,0}.

src/backend/utils/adt/geo_ops.c patch | blob | blame | history

diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c

index 1fb2ff2603ca4b4292c195b170feb3b0f791fdc5..621b5c33ef1b1bc1fba98c9eca73a786fa3198d2 100644 (file)

--- a/src/backend/utils/adt/geo_ops.c

+++ b/src/backend/utils/adt/geo_ops.c

@@ -1024,6 +1024,9 @@ line_construct(LINE *result, Point *pt, float8 m)

result->A = m;

result->B = -1.0;

result->C = pt->y - m * pt->x;

+ /* on some platforms, the preceding expression tends to produce -0 */

+ if (result->C == 0.0)

+ result->C = 0.0;

}

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