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Commitb0f2d68

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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 thegiven point but a line almost indistinguishable from the Y-axis, althoughnot truly vertical. The only caller that tries to use this function withm == 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 placewhere the lseg's line crosses the Y-axis. That function is used by otheroperators too, so there are several operators that could compute wrongdistances from a line segment to something else. Per bug #5745 fromjindiax.Back-patch to all supported branches.
1 parent8f742d1 commitb0f2d68

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‎src/backend/utils/adt/geo_ops.c

Lines changed: 11 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1072,13 +1072,20 @@ line_construct_pm(Point *pt, double m)
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{
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LINE*result= (LINE*)palloc(sizeof(LINE));
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1075-
/* use "mx - y + yinter = 0" */
1076-
result->A=m;
1077-
result->B=-1.0;
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if (m==DBL_MAX)
1079-
result->C=pt->y;
1076+
{
1077+
/* vertical - use "x = C" */
1078+
result->A=-1;
1079+
result->B=0;
1080+
result->C=pt->x;
1081+
}
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else
1083+
{
1084+
/* use "mx - y + yinter = 0" */
1085+
result->A=m;
1086+
result->B=-1.0;
10811087
result->C=pt->y-m*pt->x;
1088+
}
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#ifdefNOT_USED
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result->m=m;

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