1. in test file, the caseplace holder support andplace holder support2 are almost the same, what's the difference between the 2 cases, I mean, maybeplace holder support2 is not necessary.

2. It seems the syntax only support some sql likeselect ${a} from b rather thanselect a from ${a}. If that's intentional,, I think you could make it more clear in the README.

@cctv1005s

1. place holder support2 put placeholder into quotation, it's testing placeholder feature should not affect normal use of$.

2. since table_name is anIDENTIFIER, it's not supported yet. Will add this info to readme.

Okay, lGTM