459f43b39c
2. added extra parameter 'estimate_extent'. By default, exact extent will be calulated e.g :
select extent(geom) from table_name;
Sometimes it is more practical (faster!) to use estimated extent
select estimated_extent('table_name','geom');
but it is somewhere around 95% accurate.
Usage:
....
params["estimate_extent"]="true";
....
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