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<h3>convexHull function</h3>
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Returns the convex hull of a geometry. It represents the minimum convex geometry that encloses all geometries within the set.
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<h4>Syntax</h4>
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<pre>convexHull( a, b )</pre>
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<h4>Arguments</h4>
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a → geometry
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a → geometry
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<h4>Example</h4>
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<pre> geomToWKT( convexHull( geomFromWKT( 'LINESTRING(3 3 , 4 4 , 4 10)' )) ) → returns POLYGON((3 3,4 10,4 4,3 3)) </pre>
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