[TIMOB-2147] Android: PRAGMA and non-SELECT statements return null from Ti.Database.DB.execute() instead of ResultSet

I'm attempting to upgrade a database table from a prior revision of my app by checking if fields are present on a table. To do this, I'm using SQLite's PRAGMA statement:

  PRAGMA table_info(account)

On iOS w/ current git-master code this works fine, as well as directly hitting databases with 'sqlite3'. However on Android, DB.execute() returns null instead of a ResultSet object, so I cannot access any of the returned data.

This appears to be because the Android TiDatabaseProxy.java assumes that only SELECT statements can ever return data:

if(sql.trim().toLowerCase().startsWith("select")) {
    c = db.rawQuery(sql, newArgs);
    if (c != null) {
        rs = new TiResultSetProxy(getTiContext(), c);
        if (rs.isValidRow()) {
            rs.next(); // Position on first row if we have data.
        }
    } else {
        rs = new TiResultSetProxy(getTiContext(), null); // because iPhone does it this way.
    }
} else {
    if (args != null) {
        db.execSQL(sql, args);
    } else {
        db.execSQL(sql);
    }
}

The iPhone implementation on the other hand doesn't make any such assumption, and ships every query through the same code paths. If the result info from the DB has no columns, then it returns null instead of a ResultSet.