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space taken by NULL values in array

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Hi,


since postgresql multidimensional arrays can't have different size per axis, I
was wondering what would happen in case I used an array of, say, 10x10
elements, where only 10x2 elements are filled and the rest are NULL. I guess
the NULL elements take space (and I would have 80% of the space wasted),
but I'm not sure... 

Can someone confirm?




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