This is far less brittle at runtime, but slightly more work at dev time.
The following things are undesirable but make it much easier to write:
* Use of `CREATE_TABLE_APP.replaceFirst(...)` to create the temp tables.
* Having to specify a list fo columns twice in `Schema` (`ALL_COLS` + `COLS`).
The `replaceFirst` means we don't need to maintain two separate create table
statements. It is a little messy because there is no compile time guarantee
that we are creating a valid SQL statement at the end, just our knowledge
that a create table statment tends to have the table name first and it
probably wont cause problems.
The `ALL_COLS` + `COLS` is required so that we don't have to type out a list
of fields when copying data in `TempAppProvider`. Otherwise, whenever a new
column is added, developers would need to know that it also needs to be added
to this third place. Currently it is in the `Schema` and the `CREATE_TABLE_*`
statements where one needs to add a new column. These are both intuitive and
hopefully easily discoverable. Having to add it to the `TempAppProvider` is
less intuitive and likely to result in bugs.
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