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Collection Extract - Extract MULTILINESTRING
:memory: #use in-memory database
SELECT AsText(CollectionExtract(GeomFromText('GEOMETRYCOLLECTION(POINT(0 0), LINESTRING(0 0, 1 1), POLYGON((0 0, 1 0, 1 1, 0 1, 0 0)), POINT(1 1), LINESTRING(1 1, 2 2), POLYGON((1 1, 2 1, 2 2, 1 2, 1 1)))'), 3));
1 # rows (not including the header row)
1 # columns
AsText(CollectionExtract(GeomFromText('GEOMETRYCOLLECTION(POINT(0 0), LINESTRING(0 0, 1 1), POLYGON((0 0, 1 0, 1 1, 0 1, 0 0)), POINT(1 1), LINESTRING(1 1, 2 2), POLYGON((1 1, 2 1, 2 2, 1 2, 1 1)))'), 3))
MULTIPOLYGON(((0 0, 1 0, 1 1, 0 1, 0 0)), ((1 1, 2 1, 2 2, 1 2, 1 1)))
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