sql_fun_sqlast/sem/scalar_expr/arith_expr/
null_if.rs

1use crate::sem::{AnalysisError, SemScalarExpr, TypeReference, scalar_expr::SemScalarExprNode};
2
3use super::ArithExpr;
4
5#[derive(Debug, Clone, Eq, Hash, PartialEq, serde::Serialize, serde::Deserialize)]
6pub struct NullIfExpr {
7    return_value: SemScalarExpr,
8    comparison_value: SemScalarExpr,
9}
10
11impl NullIfExpr {
12    pub fn is_not_null(&self) -> Option<bool> {
13        Some(false)
14    }
15
16    pub fn is_strict(&self) -> bool {
17        false
18    }
19}
20
21impl SemScalarExprNode for NullIfExpr {
22    fn get_type(&self) -> Option<TypeReference> {
23        self.return_value.get_type()
24    }
25
26    fn is_not_null(&self) -> Option<bool> {
27        Some(false)
28    }
29}
30
31impl ArithExpr {
32    /// create instance
33    pub fn build_null_if<TParseContext>(
34        context: TParseContext,
35        lexpr: Option<SemScalarExpr>,
36        rexpr: Option<SemScalarExpr>,
37    ) -> Result<(SemScalarExpr, TParseContext), AnalysisError> {
38        let Some(lexpr) = lexpr else {
39            AnalysisError::raise_unexpected_none("nullif.lexpr")?
40        };
41        let Some(rexpr) = rexpr else {
42            AnalysisError::raise_unexpected_none("nullif.rexpr")?
43        };
44
45        let result = Self::NullIfExpr(Box::new(NullIfExpr {
46            return_value: lexpr,
47            comparison_value: rexpr,
48        }));
49        Ok((SemScalarExpr::Arith(result), context))
50    }
51}
sql_fun_sqlast/sem/scalar_expr/arith_expr/null_if.rs

sql_fun_sqlast/sem/scalar_expr/arith_expr/
null_if.rs
