Function is_zero_arg_keyword_function

nodedb-sql/src/resolver/expr/convert.rs:22–36

SQL-standard niladic functions: written without parentheses. Parsers emit them as bare identifiers; we promote them to function calls so they fold to a value at plan time instead of resolving to a column.

(name: &str)

/// emit them as bare identifiers; we promote them to function calls so
/// they fold to a value at plan time instead of resolving to a column.
fn is_zero_arg_keyword_function(name: &str) -> bool {
    matches!(
        name,
        "current_timestamp"
            | "current_date"
            | "current_time"
            | "localtime"
            | "localtimestamp"
            | "current_user"
            | "current_role"
            | "current_schema"
            | "session_user"
            | "user"
    )
}

/// Convert a sqlparser `Expr` to our `SqlExpr`.
pub fn convert_expr(expr: &Expr) -> Result<SqlExpr> {