Function eval_constant_expr

nodedb-sql/src/planner/select/helpers.rs:91–93

Evaluate a constant SqlExpr to a SqlValue. Delegates to the shared `const_fold::fold_constant` helper so that zero-arg scalar functions like `now()` and `current_timestamp` go through the same evaluator as the runtime expression path.

(expr: &SqlExpr, functions: &FunctionRegistry)

/// like `now()` and `current_timestamp` go through the same evaluator
/// as the runtime expression path.
pub(super) fn eval_constant_expr(expr: &SqlExpr, functions: &FunctionRegistry) -> SqlValue {
    crate::planner::const_fold::fold_constant(expr, functions).unwrap_or(SqlValue::Null)
}

/// Extract a geometry argument: handles ST_Point(lon, lat), ST_GeomFromGeoJSON('...'),
/// or a raw string literal containing GeoJSON.