Support parsing dates, times, and timestamps as strings

src/sqlast/value.rs

@@ -15,6 +15,12 @@ pub enum Value {
     HexStringLiteral(String),
     /// Boolean value true or false
     Boolean(bool),
+    /// Date literals
+    Date(String),
+    /// Time literals
+    Time(String),
+    /// Timestamp literals, which include both a date and time
+    Timestamp(String),
     /// NULL value in insert statements,
     Null,
 }
@@ -28,6 +34,9 @@ impl ToString for Value {
             Value::NationalStringLiteral(v) => format!("N'{}'", v),
             Value::HexStringLiteral(v) => format!("X'{}'", v),
             Value::Boolean(v) => v.to_string(),
+            Value::Date(v) => format!("DATE '{}'", escape_single_quote_string(v)),
+            Value::Time(v) => format!("TIME '{}'", escape_single_quote_string(v)),
+            Value::Timestamp(v) => format!("TIMESTAMP '{}'", escape_single_quote_string(v)),
             Value::Null => "NULL".to_string(),
         }
     }

src/sqlparser.rs

@@ -192,12 +192,17 @@ impl Parser {
                 }
                 "CASE" => self.parse_case_expression(),
                 "CAST" => self.parse_cast_expression(),
+                "DATE" => Ok(ASTNode::SQLValue(Value::Date(self.parse_literal_string()?))),
                 "EXISTS" => self.parse_exists_expression(),
                 "EXTRACT" => self.parse_extract_expression(),
                 "NOT" => Ok(ASTNode::SQLUnary {
                     operator: SQLOperator::Not,
                     expr: Box::new(self.parse_subexpr(Self::UNARY_NOT_PREC)?),
                 }),
+                "TIME" => Ok(ASTNode::SQLValue(Value::Time(self.parse_literal_string()?))),
+                "TIMESTAMP" => Ok(ASTNode::SQLValue(Value::Timestamp(
+                    self.parse_literal_string()?,
+                ))),
                 // Here `w` is a word, check if it's a part of a multi-part
                 // identifier, a function call, or a simple identifier:
                 _ => match self.peek_token() {

tests/sqlparser_common.rs

@@ -1085,6 +1085,36 @@ fn parse_literal_string() {
     one_statement_parses_to("SELECT x'deadBEEF'", "SELECT X'deadBEEF'");
 }
 
+#[test]
+fn parse_literal_date() {
+    let sql = "SELECT DATE '1999-01-01'";
+    let select = verified_only_select(sql);
+    assert_eq!(
+        &ASTNode::SQLValue(Value::Date("1999-01-01".into())),
+        expr_from_projection(only(&select.projection)),
+    );
+}
+
+#[test]
+fn parse_literal_time() {
+    let sql = "SELECT TIME '01:23:34'";
+    let select = verified_only_select(sql);
+    assert_eq!(
+        &ASTNode::SQLValue(Value::Time("01:23:34".into())),
+        expr_from_projection(only(&select.projection)),
+    );
+}
+
+#[test]
+fn parse_literal_timestamp() {
+    let sql = "SELECT TIMESTAMP '1999-01-01 01:23:34'";
+    let select = verified_only_select(sql);
+    assert_eq!(
+        &ASTNode::SQLValue(Value::Timestamp("1999-01-01 01:23:34".into())),
+        expr_from_projection(only(&select.projection)),
+    );
+}
+
 #[test]
 fn parse_simple_math_expr_plus() {
     let sql = "SELECT a + b, 2 + a, 2.5 + a, a_f + b_f, 2 + a_f, 2.5 + a_f FROM c";