Query parameters aren't used in create call

[dyllan-to-you]

Hi! I'm attempting to use $modify on create call to enable a onConflictIgnore type flag in postgresql. However, it doesn't look like the $modify is actually being applied.

Looking at the code, it appears that the createQuery call deletes the query parameters after it is used. However, in the _create flow that ends up calling _batchInsert, it appears createQuery is called twice. It is first called by _create, and then called again by _batchInsert. This results in the query parameters being deleted by the createQuery call within _create, and thus never making it to _batchInsert.

To me, it seems like there are two possible solutions:
1. pass the createQuery from _create into batchInsert. This works for the postgressql/mysql usecase, but not for the default case.
2. Don't delete query parameters in createQuery. I'm not sure what side effects this would cause, however.

On a second look at the code, it looks like create uses _createQuery instead of createQuery. This appears to complicate matters a bit...