provide typed string

Author: maxcountryman

src/ast/mod.rs

@@ -205,6 +205,8 @@ pub enum Expr {
     Nested(Box<Expr>),
     /// A literal value, such as string, number, date or NULL
     Value(Value),
+    /// A structure containing a `String` as well as an associated data type.
+    TypedString { data_type: DataType, value: String },
     /// Scalar function call e.g. `LEFT(foo, 5)`
     Function(Function),
     /// `CASE [<operand>] WHEN <condition> THEN <result> ... [ELSE <result>] END`
@@ -279,6 +281,10 @@ impl fmt::Display for Expr {
             Expr::Collate { expr, collation } => write!(f, "{} COLLATE {}", expr, collation),
             Expr::Nested(ast) => write!(f, "({})", ast),
             Expr::Value(v) => write!(f, "{}", v),
+            Expr::TypedString { data_type, value } => {
+                write!(f, "{}", data_type)?;
+                write!(f, " '{}'", &value::escape_single_quote_string(value))
+            }
             Expr::Function(fun) => write!(f, "{}", fun),
             Expr::Case {
                 operand,