ES|QL ST_UNION function

Returns the geometric union of two geometries.

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geomA

Expression of type geo_point, geo_shape, cartesian_point or cartesian_shape. If null, the function returns null.

geomB

Expression of type geo_point, geo_shape, cartesian_point or cartesian_shape. Must share the same coordinate reference system as the first parameter. If null, the function returns null.

Returns the geometric union of two geometries. The result is a geometry that covers all points covered by either input geometry. Both geometries must share the same coordinate reference system.

ROW a = TO_GEOSHAPE("POLYGON ((0 0, 2 0, 2 2, 0 2, 0 0))"),
    b = TO_GEOSHAPE("POLYGON ((2 0, 4 0, 4 2, 2 2, 2 0))")
| EVAL unioned = ST_UNION(a, b)
| KEEP unioned
		

Union of two overlapping polygons

The union of two overlapping squares covers the area of both.

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