Details
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Bug
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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10.5, 10.6, 10.11, 11.4
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None
Description
For ST_Buffer, a negative distance shrinks the geometry rather than expanding it. So the negative buffer of a Polygon should be in the Polygon.
SET @g1 = ST_GeomFromText('POLYGON((83 32,-23 113,-96 240,-87 246,-89 249,-33 287,174 35,175 32,118 0,96 38,83 32),(98 40,97 39,96 39,98 40))'); |
SET @g2 = ST_Buffer(@g1, -10); |
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SELECT ST_Within(@g2, @g1); |
-- expected: {1}
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-- actual : {0} |