linkrs-query 0.1.0

Query engine, parser, and executor for Linkrs
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

use crate::executor::expression::ExpressionError;
use linkrs_core::value::NullType;
use linkrs_core::Value;

pub fn execute_st_astext(args: &[Value]) -> Result<Value, ExpressionError> {
    match &args[0] {
        Value::Geography(geo) => {
            let wkt = geo.to_wkt();
            Ok(Value::string(wkt))
        }
        Value::Null(_) => Ok(Value::Null(NullType::Null)),
        _ => Err(ExpressionError::type_error(
            "The st_astext function requires the geographic type",
        )),
    }
}

pub fn execute_st_asgeojson(args: &[Value]) -> Result<Value, ExpressionError> {
    match &args[0] {
        Value::Geography(geo) => {
            let json_str = geo.to_geojson_string();
            Ok(Value::string(json_str))
        }
        Value::Null(_) => Ok(Value::Null(NullType::Null)),
        _ => Err(ExpressionError::type_error(
            "The st_asgeojson function requires geography type",
        )),
    }
}