add test case, switch from using a nullable to undefined

Author: gracen-writes-code

query.zig

@@ -56,7 +56,7 @@ pub fn ParsedQuery(comptime tmp_query: []const u8) type {
             // This holds the starting character of the string while
             // state is .inside_string so that we know which type of
             // string we're exiting from
-            var string_starting_character: ?u8 = null;
+            var string_starting_character: u8 = undefined;
 
             var current_bind_marker_type: [256]u8 = undefined;
             var current_bind_marker_type_pos = 0;
@@ -452,6 +452,11 @@ test "parsed query: bind marker character inside string" {
             .exp_bind_markers = 1,
             .exp = "SELECT json_extract(metadata, '$.name') AS name FROM foobar WHERE name = $name",
         },
+        .{
+            .query = "SELECT json_extract(metadata, '$[0]') AS name FROM foobar",
+            .exp_bind_markers = 0,
+            .exp = "SELECT json_extract(metadata, '$[0]') AS name FROM foobar",
+        },
     };
 
     inline for (testCases) |tc| {