Struct ParsedDistancePredicate 

pub struct ParsedDistancePredicate {
    pub arg0: Arc<dyn PhysicalExpr>,
    pub arg1: Arc<dyn PhysicalExpr>,
    pub arg_distance: Arc<dyn PhysicalExpr>,
}

Represents a parsed distance predicate with its constituent parts.

Distance predicates are spatial operations that determine whether two geometries are within a specified distance of each other. This struct holds the parsed components of such predicates for further processing.

Supported Distance Predicate Forms

This struct can represent the parsed components from any of these distance predicate forms:

1. Direct distance function:

   • st_dwithin(geom1, geom2, distance) - Returns true if geometries are within the distance

2. Distance comparison (left-to-right):

   • st_distance(geom1, geom2) <= distance - Distance is less than or equal to threshold
   • st_distance(geom1, geom2) < distance - Distance is strictly less than threshold

3. Distance comparison (right-to-left):

   • distance >= st_distance(geom1, geom2) - Threshold is greater than or equal to distance
   • distance > st_distance(geom1, geom2) - Threshold is strictly greater than distance

All forms are logically equivalent but may appear differently in SQL queries. The parser normalizes them into this common structure for uniform processing.

Fields

arg0: Arc<dyn PhysicalExpr>

The first geometry argument in the distance predicate

arg1: Arc<dyn PhysicalExpr>

The second geometry argument in the distance predicate

arg_distance: Arc<dyn PhysicalExpr>

The distance threshold argument (as a physical expression)