[MDEV-35790] The negative buffer of Polygon does not within itself - Jira

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);

SELECT ST_Within(@g2, @g1);

-- expected: {1}

-- actual : {0}

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