Curve Thoughts

[Paul Ramsey]

The problem of how to deal with curve “decomposition” functions (ST_GeometryN, ST_Dump, ST_DumpRings) in the presence of the various Curve types, and our current inconsistent behaviour with them.

https://gist.github.com/pramsey/cbf6db1edb8762854925f6b6ad6d6b35

What it really comes down to is “are CompoundCurve and CurvePolygon collections or not”. If “not”, if they are unitary, then there are quite a few changes to be made in the behaviour of things like ST_Dump, and other functions that currently just stuff them through collection handling. 

So, your answer: unitary? or collection?
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