Method leaf

crates/paimon/src/spec/predicate.rs:656–669

Resolve field name to index + type, validate literals, and build a leaf predicate.

(&self, field: &str, op: PredicateOperator, literals: Vec<Datum>)

    /// Resolve field name to index + type, validate literals, and build a leaf predicate.
    fn leaf(&self, field: &str, op: PredicateOperator, literals: Vec<Datum>) -> Result<Predicate> {
        let (index, data_type) = self.resolve_field(field)?;
        Self::validate_literal_count(op, &literals)?;
        for lit in &literals {
            validate_datum_matches_type(lit, &data_type)?;
        }
        Ok(Predicate::Leaf {
            column: field.to_string(),
            index,
            data_type,
            op,
            literals,
        })
    }

    /// Look up a field name, returning its (index, DataType) or an error.
    fn resolve_field(&self, field: &str) -> Result<(usize, DataType)> {