Optimize orc/parquet string dict filter in not_single_conjunct case. We can optimize this processing to filter block firstly by dict code, then filter by not_single_conjunct. Because dict code is int, it will filter faster than string.
For example:
```
select count(l_receiptdate) from lineitem_date_as_string where l_shipmode in ('MAIL', 'SHIP') and l_commitdate < l_receiptdate and l_receiptdate >= '1994-01-01' and l_receiptdate < '1995-01-01';
```
`l_receiptdate` and `l_shipmode` will using string dict filtering, and `l_commitdate < l_receiptdate` is the an not_single_conjunct which contains dict filter field. We can optimize this processing to filter block firstly by dict code, then filter by not_single_conjunct. Because dict code is int, it will filter faster than string.
### Test Result:
Before:
mysql> select count(l_receiptdate) from lineitem_date_as_string where l_shipmode in ('MAIL', 'SHIP') and l_commitdate < l_receiptdate and l_receiptdate >= '1994-01-01' and l_receiptdate < '1995-01-01';
+----------------------+
| count(l_receiptdate) |
+----------------------+
| 49314694 |
+----------------------+
1 row in set (6.87 sec)
After:
mysql> select count(l_receiptdate) from lineitem_date_as_string where l_shipmode in ('MAIL', 'SHIP') and l_commitdate < l_receiptdate and l_receiptdate >= '1994-01-01' and l_receiptdate < '1995-01-01';
+----------------------+
| count(l_receiptdate) |
+----------------------+
| 49314694 |
+----------------------+
1 row in set (4.85 sec)
For better performance and elasticity, we move memtable from loadchannel to
sink, VTabletSinkV2 is introduced, then there are VTabletWriter and
VTabletSinkV2 distributing rows to tablets. where clauses on mvs are
executed in VTabletWriter, while VTabletSinkV2 needs it too. So common code
is moved to row distribution.
Actually, we can layer code by rows' data flow, then the code is much more
understood and maintainable.
ScanNode -> Sink/Writer (RowDistribution -> IndexChannel / DeltaWriter)
`VFileScanner` will try to append late arrival runtime filters in each loop of `ScannerScheduler::_scanner_scan`. However, `VFileScanner::_get_next_reader` only generates the `_push_down_conjuncts` in the first loop, so the late arrival runtime filters are ignored.
row numbers miscounting because of race condition, will cause load to
fail sometimes with warning 'the rows number written doesn't match'.
Signed-off-by: freemandealer <freeman.zhang1992@gmail.com>
1. Fix memory issues in LoadStreamMgrTest.
2. Skip S3FileWriterTest by default because it depends on the environment in teamcity.
3. Fix VTimestampFunctionsTest.convert_tz_test.
