Fix line_construct_pm() for the case of "infinite" (DBL_MAX) slope.
This code was just plain wrong: what you got was not a line through the
given point but a line almost indistinguishable from the Y-axis, although
not truly vertical. The only caller that tries to use this function with
m == DBL_MAX is dist_ps_internal for the case where the lseg is horizontal;
it would end up producing the distance from the given point to the place
where the lseg's line crosses the Y-axis. That function is used by other
operators too, so there are several operators that could compute wrong
distances from a line segment to something else. Per bug #5745 from
jindiax.
Back-patch to all supported branches.
Branch
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REL8_1_STABLE
Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=5154ebad98acd6a3b7aa0a196654b0244429cb98
Modified Files
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src/backend/utils/adt/geo_ops.c | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)