fix: Support expr instead of string for argument to interval (#517)

* fix: use expr instead of string in interval

* chore: resolve CI

Co-authored-by: togami2864 <yoshiaki.togami@plaid.co.jp>

src/ast/value.rs

@@ -10,6 +10,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#[cfg(not(feature = "std"))]
+use alloc::boxed::Box;
 #[cfg(not(feature = "std"))]
 use alloc::string::String;
 use core::fmt;
@@ -19,6 +21,8 @@ use bigdecimal::BigDecimal;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
+use super::Expr;
+
 /// Primitive SQL values such as number and string
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
@@ -50,7 +54,7 @@ pub enum Value {
     /// that the `<leading_field>` units >= the units in `<last_field>`,
     /// so the user will have to reject intervals like `HOUR TO YEAR`.
     Interval {
-        value: String,
+        value: Box<Expr>,
         leading_field: Option<DateTimeField>,
         leading_precision: Option<u64>,
         last_field: Option<DateTimeField>,
@@ -88,10 +92,8 @@ impl fmt::Display for Value {
                 assert!(last_field.is_none());
                 write!(
                     f,
-                    "INTERVAL '{}' SECOND ({}, {})",
+                    "INTERVAL {} SECOND ({}, {})",
-                    escape_single_quote_string(value),
+                    value, leading_precision, fractional_seconds_precision
-                    leading_precision,
-                    fractional_seconds_precision
                 )
             }
             Value::Interval {
@@ -101,7 +103,7 @@ impl fmt::Display for Value {
                 last_field,
                 fractional_seconds_precision,
             } => {
-                write!(f, "INTERVAL '{}'", escape_single_quote_string(value))?;
+                write!(f, "INTERVAL {}", value)?;
                 if let Some(leading_field) = leading_field {
                     write!(f, " {}", leading_field)?;
                 }

src/parser.rs

@@ -994,6 +994,7 @@ impl<'a> Parser<'a> {
     ///   4. `INTERVAL '1:1:1.1' HOUR (5) TO SECOND (5)`
     ///   5. `INTERVAL '1.1' SECOND (2, 2)`
     ///   6. `INTERVAL '1:1' HOUR (5) TO MINUTE (5)`
+    ///   7. (MySql and BigQuey only):`INTERVAL 1 DAY`
     ///
     /// Note that we do not currently attempt to parse the quoted value.
     pub fn parse_literal_interval(&mut self) -> Result<Expr, ParserError> {
@@ -1004,13 +1005,13 @@ impl<'a> Parser<'a> {
 
         // The first token in an interval is a string literal which specifies
         // the duration of the interval.
-        let value = self.parse_literal_string()?;
+        let value = self.parse_expr()?;
 
         // Following the string literal is a qualifier which indicates the units
         // of the duration specified in the string literal.
         //
         // Note that PostgreSQL allows omitting the qualifier, so we provide
-        // this more general implemenation.
+        // this more general implementation.
         let leading_field = match self.peek_token() {
             Token::Word(kw)
                 if [
@@ -1071,7 +1072,7 @@ impl<'a> Parser<'a> {
             };
 
         Ok(Expr::Value(Value::Interval {
-            value,
+            value: Box::new(value),
             leading_field,
             leading_precision,
             last_field,

tests/sqlparser_common.rs

@@ -2649,7 +2649,7 @@ fn parse_literal_interval() {
     let select = verified_only_select(sql);
     assert_eq!(
         &Expr::Value(Value::Interval {
-            value: "1-1".into(),
+            value: Box::new(Expr::Value(Value::SingleQuotedString(String::from("1-1")))),
             leading_field: Some(DateTimeField::Year),
             leading_precision: None,
             last_field: Some(DateTimeField::Month),
@@ -2662,7 +2662,9 @@ fn parse_literal_interval() {
     let select = verified_only_select(sql);
     assert_eq!(
         &Expr::Value(Value::Interval {
-            value: "01:01.01".into(),
+            value: Box::new(Expr::Value(Value::SingleQuotedString(String::from(
+                "01:01.01"
+            )))),
             leading_field: Some(DateTimeField::Minute),
             leading_precision: Some(5),
             last_field: Some(DateTimeField::Second),
@@ -2675,7 +2677,7 @@ fn parse_literal_interval() {
     let select = verified_only_select(sql);
     assert_eq!(
         &Expr::Value(Value::Interval {
-            value: "1".into(),
+            value: Box::new(Expr::Value(Value::SingleQuotedString(String::from("1")))),
             leading_field: Some(DateTimeField::Second),
             leading_precision: Some(5),
             last_field: None,
@@ -2688,7 +2690,7 @@ fn parse_literal_interval() {
     let select = verified_only_select(sql);
     assert_eq!(
         &Expr::Value(Value::Interval {
-            value: "10".into(),
+            value: Box::new(Expr::Value(Value::SingleQuotedString(String::from("10")))),
             leading_field: Some(DateTimeField::Hour),
             leading_precision: None,
             last_field: None,
@@ -2697,11 +2699,41 @@ fn parse_literal_interval() {
         expr_from_projection(only(&select.projection)),
     );
 
+    let sql = "SELECT INTERVAL 5 DAY";
+    let select = verified_only_select(sql);
+    assert_eq!(
+        &Expr::Value(Value::Interval {
+            value: Box::new(Expr::Value(number("5"))),
+            leading_field: Some(DateTimeField::Day),
+            leading_precision: None,
+            last_field: None,
+            fractional_seconds_precision: None,
+        }),
+        expr_from_projection(only(&select.projection)),
+    );
+
+    let sql = "SELECT INTERVAL 1 + 1 DAY";
+    let select = verified_only_select(sql);
+    assert_eq!(
+        &Expr::Value(Value::Interval {
+            value: Box::new(Expr::BinaryOp {
+                left: Box::new(Expr::Value(number("1"))),
+                op: BinaryOperator::Plus,
+                right: Box::new(Expr::Value(number("1")))
+            }),
+            leading_field: Some(DateTimeField::Day),
+            leading_precision: None,
+            last_field: None,
+            fractional_seconds_precision: None,
+        }),
+        expr_from_projection(only(&select.projection)),
+    );
+
     let sql = "SELECT INTERVAL '10' HOUR (1)";
     let select = verified_only_select(sql);
     assert_eq!(
         &Expr::Value(Value::Interval {
-            value: "10".into(),
+            value: Box::new(Expr::Value(Value::SingleQuotedString(String::from("10")))),
             leading_field: Some(DateTimeField::Hour),
             leading_precision: Some(1),
             last_field: None,
@@ -2714,7 +2746,9 @@ fn parse_literal_interval() {
     let select = verified_only_select(sql);
     assert_eq!(
         &Expr::Value(Value::Interval {
-            value: "1 DAY".into(),
+            value: Box::new(Expr::Value(Value::SingleQuotedString(String::from(
+                "1 DAY"
+            )))),
             leading_field: None,
             leading_precision: None,
             last_field: None,