ST_MemUnion

ST_MemUnion
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Name

ST_MemUnion — Same as ST_Union, only memory-friendly (uses less memory and more processor time).

geometry ST_MemUnion ( geometry set geomfield ) ;

Some useful description here.


	Same as ST_Union, only memory-friendly (uses less memory and more processor time). This aggregate function works by unioning the geometries one at a time to previous result as opposed to ST_Union aggregate which first creates an array and then unions

This function supports 3d and will not drop the z-index.

See ST_Union

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