select cast(k1 as INT) as id from tbl1 order by id limit 2;
is not valid for topN optimization, because 'id' is
a cast expr not a table column from scan node.
This pr address this issue.
Support to delete expired stats periodically and manually.
default cleaner running interval is 2 days
Manually clean syntax is
```sql
DROP EXPIRED STATS
```
TODO:
1. process external catalog's stats
2. run drop at the appointed time
3. sleep a short time after drop one batch
`select count(*) from T group by A, B`
suppose `ndv(A) > ndv(B)`
the estimated row count of aggregate is between ndv(A) and ndv(A) * ndv(B)
in previous version, we choose upper bound, that is ndv(A) * ndv(B). The drawback of this choice is the estimated row is often bigger that row count of T.
In this version, we choose the lower bound.
Because of the limitation of ProjectPlanner, we have to keep set agg functions materialized if there is any virtual slots in the group by list, such as 'GROUPING_ID' in the group by list etc.
Consider sql
select table_B_alias.b from table_B_alias where table_B_alias.b in ( select a from table_A_alias );
if table_B_alias.b is int and table_A_alias.a is bigint,
we should cast(b as bigint) to make the data type the same as the InSubquery.
sql : select bitmap_empty() from d_table where true;
should always use base index instead of any mv, because the conjuncts is constant (true) and use none of the column from any mv
could reproduced by:
CREATE TABLE t (
name varchar(128)
) ENGINE=OLAP
UNIQUE KEY(name)
DISTRIBUTED BY HASH(name) BUCKETS 1;
insert into t values('abc');
SELECT cd
FROM
(SELECT cast(now() as string) cd FROM t) t1
JOIN
(select cast(now() as string) td from t GROUP BY now()) t2
ON t1.cd = t2.td;
ERROR 1105 (HY000): errCode = 2, detailMessage = Unexpected exception: null
When processing data in hash table for right join and full outer join, if the output data rows of one hash bucket excceeds batch size, the logic when continue processing this bucket is wrong, it should differentiate between different join types.
1. Support the show load warnings for mysql load to get the detail error message.
2. Fix fillByteBufferAsync not mark the load as finished in same data load
3. Fix drain data only in client mode.
jdbc read array type get result from Doris is string, PG is java.sql.array, CK is java.lang.object
it's difficult to maintain and read the code,
so change all database's array result to string, then add a cast function from string to doris array type
1. create a project node to adjust the output column position when a mv is selected in olap scan node
2. pass SlotReference's column info when call Alias's toSlot() method
3. should compare plan's logical properties when compare two plans after rewrite
