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collect - Polygon, PolygonZ
:memory: #use in-memory database
SELECT AsText(COLLECT(GeomFromText('POLYGON((1 2, 3 4, 3 2, 1 2),(1.5 2.5, 2.5 3.5, 2.5 2.3, 1.5 2.5))'), GeomFromText('POLYGONZ((4 5 3.2, 1 2 4.6, 4 2 3.1, 4 5 3.2),(2 3 4, 3 4 1, 3 3 1, 2 3 4))')));
1 # rows (not including the header row)
1 # columns
AsText(COLLECT(GeomFromText('POLYGON((1 2, 3 4, 3 2, 1 2),(1.5 2.5, 2.5 3.5, 2.5 2.3, 1.5 2.5))'), GeomFromText('POLYGONZ((4 5 3.2, 1 2 4.6, 4 2 3.1, 4 5 3.2),(2 3 4, 3 4 1, 3 3 1, 2 3 4))')))
MULTIPOLYGON(((1 2, 3 4, 3 2, 1 2), (1.5 2.5, 2.5 3.5, 2.5 2.3, 1.5 2.5)), ((4 5, 1 2, 4 2, 4 5), (2 3, 3 4, 3 3, 2 3)))
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