postgres.git / summary / log / commit / refs

commit    74294c7301340eeb477343dd26d98d2f3e33bd20
Author:   Tomas Vondra <tomas.vondra@postgresql.org>
Date:     Sun Jul 29 18:35:18 2018 +0000

    Restore handling of -0 in the C field of lines in line_construct().
    
    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 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c
index 1fb2ff2603c..621b5c33ef1 100644
--- 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;
 	}
 }
 


[parent: fb17eabf1b51]