Updated parse_infix(..) in mysql.rs and sqlite.rs to handle error rather than unwrap() (apache#2207)

Author: RPG-Alex

src/dialect/mysql.rs

@@ -102,10 +102,15 @@ impl Dialect for MySqlDialect {
     ) -> Option<Result<crate::ast::Expr, ParserError>> {
         // Parse DIV as an operator
         if parser.parse_keyword(Keyword::DIV) {
+            let left = Box::new(expr.clone());
+            let right = Box::new(match parser.parse_expr() {
+                Ok(expr) => expr,
+                Err(e) => return Some(Err(e)),
+            });
             Some(Ok(Expr::BinaryOp {
-                left: Box::new(expr.clone()),
+                left,
                 op: BinaryOperator::MyIntegerDivide,
-                right: Box::new(parser.parse_expr().unwrap()),
+                right,
             }))
         } else {
             None

tests/sqlparser_mysql.rs

@@ -3627,6 +3627,14 @@ fn parse_div_infix() {
     mysql().verified_stmt(r#"SELECT 5 DIV 2"#);
 }
 
+#[test]
+fn parse_div_infix_propagates_parse_error() {
+    let err = mysql()
+        .parse_sql_statements("SELECT 5 DIV")
+        .expect_err("expected an error");
+    assert_matches!(err, ParserError::ParserError(_));
+}
+
 #[test]
 fn parse_drop_temporary_table() {
     let sql = "DROP TEMPORARY TABLE foo";