kaka11chen opened a new pull request, #26696:
URL: https://github.com/apache/doris/pull/26696
## Proposed changes
Backport from #26386.
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.
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)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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