public static GeometryExpression<?> collect(Expression<? extends Geometry> expr1, Expression<? extends Geometry> expr2) {
        return geometryOperation(SpatialOps.COLLECT2, expr1, expr2);
    }
Return a specified ST_Geometry value from a collection of other geometries.

@param expr1 geometry
@param expr2 other geometry
@return  geometry collection
querydsl-spatial/src/main/java/com/querydsl/spatial/GeometryExpressions.java