Code review fixes

src/ast/mod.rs

@@ -1125,13 +1125,7 @@ pub enum Expr {
     /// [DuckDb](https://duckdb.org/docs/sql/functions/lambda.html)
     Lambda(LambdaFunction),
     /// Checks membership of a value in a JSON array
-    ///
-    /// Syntax:
-    /// ```sql
-    /// <value> MEMBER OF(<array>)
-    /// ```
-    /// [MySQL](https://dev.mysql.com/doc/refman/8.4/en/json-search-functions.html#operator_member-of)
-    MemberOf(Box<Expr>, Box<Expr>),
+    MemberOf(MemberOf),
 }
 
 impl Expr {
@@ -1920,7 +1914,7 @@ impl fmt::Display for Expr {
             }
             Expr::Prior(expr) => write!(f, "PRIOR {expr}"),
             Expr::Lambda(lambda) => write!(f, "{lambda}"),
-            Expr::MemberOf(value, array) => write!(f, "{value} MEMBER OF({array})"),
+            Expr::MemberOf(member_of) => write!(f, "{member_of}"),
         }
     }
 }
@@ -9840,6 +9834,27 @@ impl fmt::Display for NullInclusion {
     }
 }
 
+/// Checks membership of a value in a JSON array
+///
+/// Syntax:
+/// ```sql
+/// <value> MEMBER OF(<array>)
+/// ```
+/// [MySQL](https://dev.mysql.com/doc/refman/8.4/en/json-search-functions.html#operator_member-of)
+#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
+pub struct MemberOf {
+    pub value: Box<Expr>,
+    pub array: Box<Expr>,
+}
+
+impl fmt::Display for MemberOf {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{} MEMBER OF({})", self.value, self.array)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::tokenizer::Location;

src/ast/spans.rs

@@ -1619,7 +1619,7 @@ impl Spanned for Expr {
             Expr::OuterJoin(expr) => expr.span(),
             Expr::Prior(expr) => expr.span(),
             Expr::Lambda(_) => Span::empty(),
-            Expr::MemberOf(value, array) => value.span().union(&array.span()),
+            Expr::MemberOf(member_of) => member_of.value.span().union(&member_of.array.span()),
         }
     }
 }

src/parser/mod.rs

@@ -3614,7 +3614,10 @@ impl<'a> Parser<'a> {
                         let _ = self.expect_token(&Token::LParen);
                         let expr2 = self.parse_expr()?;
                         let _ = self.expect_token(&Token::RParen);
-                        Ok(Expr::MemberOf(Box::new(expr), Box::new(expr2)))
+                        Ok(Expr::MemberOf(MemberOf {
+                            value: Box::new(expr),
+                            array: Box::new(expr2),
+                        }))
                     } else {
                         self.expected("OF after MEMBER", self.peek_token())
                     }

tests/sqlparser_mysql.rs

@@ -4113,5 +4113,24 @@ fn parse_alter_table_drop_index() {
 #[test]
 fn parse_json_member_of() {
     mysql().verified_stmt(r#"SELECT 17 MEMBER OF('[23, "abc", 17, "ab", 10]')"#);
-    mysql().verified_stmt(r#"SELECT 'ab' MEMBER OF('[23, "abc", 17, "ab", 10]')"#);
+    let sql = r#"SELECT 'ab' MEMBER OF('[23, "abc", 17, "ab", 10]')"#;
+    let stmt = mysql().verified_stmt(sql);
+    match stmt {
+        Statement::Query(query) => {
+            let select = query.body.as_select().unwrap();
+            assert_eq!(
+                select.projection,
+                vec![SelectItem::UnnamedExpr(Expr::MemberOf(MemberOf {
+                    value: Box::new(Expr::Value(
+                        Value::SingleQuotedString("ab".to_string()).into()
+                    )),
+                    array: Box::new(Expr::Value(
+                        Value::SingleQuotedString(r#"[23, "abc", 17, "ab", 10]"#.to_string())
+                            .into()
+                    )),
+                }))]
+            );
+        }
+        _ => panic!("Unexpected statement {stmt}"),
+    }
 }