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fix for bug #201189 ST_BUFFER asserts if radius = 0.

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Internal caclucations can't handle zero distance properly.
        As the ST_BUFFER(geom, 0) is in fact NOOP, we'll just return the
        'geom' as the result here.

per-file comments:
  mysql-test/r/gis-precise.result
fix for bug #201189 ST_BUFFER asserts if radius = 0.
        test result updated.

  mysql-test/t/gis-precise.test
fix for bug #201189 ST_BUFFER asserts if radius = 0.
        test case added.

  sql/item_geofunc.cc
fix for bug #201189 ST_BUFFER asserts if radius = 0.
        return the first argument as the result of the ST_BUFFER, if
        the distance is 0 there.
This commit is contained in:
Alexey Botchkov 2011-06-30 19:24:52 +05:00
commit a9a6597d59
3 changed files with 18 additions and 0 deletions
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12
sql/item_geofunc.cc
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@ -1406,6 +1406,18 @@ String *Item_func_buffer::val_str(String *str_value)
!(g= Geometry::construct(&buffer, obj->ptr(), obj->length())))
goto mem_error;
/*
If the distance given is 0, the Buffer function is in fact NOOP,
so it's natural just to return the argument1.
Besides, internal calculations here can't handle zero distance anyway.
*/
if (fabs(dist) < GIS_ZERO)
{
null_value= 0;
str_result= obj;
goto mem_error;
}
if (func.reserve_op_buffer(2))
goto mem_error;
/* will specify operands later */