Add support for table-level comments (#946)

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

tests/sqlparser_mysql.rs

@@ -296,6 +296,22 @@ fn parse_create_table_auto_increment() {
     }
 }
 
+#[test]
+fn parse_create_table_comment() {
+    let canonical = "CREATE TABLE foo (bar INT) COMMENT 'baz'";
+    let with_equal = "CREATE TABLE foo (bar INT) COMMENT = 'baz'";
+
+    for sql in [canonical, with_equal] {
+        match mysql().one_statement_parses_to(sql, canonical) {
+            Statement::CreateTable { name, comment, .. } => {
+                assert_eq!(name.to_string(), "foo");
+                assert_eq!(comment.expect("Should exist").to_string(), "baz");
+            }
+            _ => unreachable!(),
+        }
+    }
+}
+
 #[test]
 fn parse_create_table_set_enum() {
     let sql = "CREATE TABLE foo (bar SET('a', 'b'), baz ENUM('a', 'b'))";