[postgis-users] Find none overlapping spot

[tommy408]

I have a bunch of square polygons scattered everywhere.  Whats the fastest
way for me to place another square polygon say 20x20 size into this area
that won't overlap any other polygons?

The only way I can think of is start the input square at a spot, and move it
by 1 unit at a time and keep checking  ST_Overlap.
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