now in pipeline, when result block queue is empty, will be reschedule, and then choose a batch of scanner,
but sometimes, get_available_thread_slot_num() will return thread_slot_num <= 0, so it's will do nothing,
and then block queue will always empty.
have no chance to reschedule again until query timeout.
1. create aggregation table
2. insert some data
3. drop the table and create again
4. modify some parameters for some branch
5. insert some data
6. change the parameters back to its default
Some error happen when using routine load
```
[INTERNAL_ERROR]Message at offset XXX might be too large to fetch, try increasing receive.message.max.bytes
```
Refer to https://github.com/confluentinc/librdkafka/issues/2993, we should upgrade librdkafka version to avoid this bug.
For left outer join or full outer join, when build side data is empty, null data is output for build side, but nested column data of nullable column is not properly initialized, which may cause decimal arithmetic overflow
**Thanks for** pr #21855 to provide a wonderful reference.
Maybe it is very difficult and **cost-expensive** to implement **a comprehensive logical plan adapter**, maybe there is just some small syntax variations between doris and some other engines (such as hive/spark), so we can just **focus on** the **difference** here.
This pr mainly focus on the **syntax difference between doris and spark-sql**. For instance, do some function tranformations and override some syntax validations.
- add a dialect named `spark_sql`
- move method `NereidsParser#parseSQLWithDialect` to `TrinoParser`
- extract some `FnCallTransformer`/`FnCallTransformers` classes, so we can reuse the logic about the function transformers
- allow derived tables without alias when we set dialect to `spark_sql`(legacy and nereids parser are both supported)
- add some function transformers for hive/spark built-in functions
### Test case (from our online doris cluster)
- Test derived table without alias
```sql
MySQL [(none)]> show variables like '%dialect%';
+---------------+-------+---------------+---------+
| Variable_name | Value | Default_Value | Changed |
+---------------+-------+---------------+---------+
| sql_dialect | spark_sql | doris | 1 |
+---------------+-------+---------------+---------+
1 row in set (0.01 sec)
MySQL [(none)]> select * from (select 1);
+------+
| 1 |
+------+
| 1 |
+------+
1 row in set (0.03 sec)
MySQL [(none)]> select __auto_generated_subquery_name.a from (select 1 as a);
+------+
| a |
+------+
| 1 |
+------+
1 row in set (0.03 sec)
MySQL [(none)]> set sql_dialect=doris;
Query OK, 0 rows affected (0.02 sec)
MySQL [(none)]> select * from (select 1);
ERROR 1248 (42000): errCode = 2, detailMessage = Every derived table must have its own alias
MySQL [(none)]>
```
- Test spark-sql/hive built-in functions
```sql
MySQL [(none)]> show global functions;
Empty set (0.01 sec)
MySQL [(none)]> show variables like '%dialect%';
+---------------+-------+---------------+---------+
| Variable_name | Value | Default_Value | Changed |
+---------------+-------+---------------+---------+
| sql_dialect | spark_sql | doris | 1 |
+---------------+-------+---------------+---------+
1 row in set (0.01 sec)
MySQL [(none)]> select get_json_object('{"a":"b"}', '$.a');
+----------------------------------+
| json_extract('{"a":"b"}', '$.a') |
+----------------------------------+
| "b" |
+----------------------------------+
1 row in set (0.04 sec)
MySQL [(none)]> select split("a b c", " ");
+-------------------------------+
| split_by_string('a b c', ' ') |
+-------------------------------+
| ["a", "b", "c"] |
+-------------------------------+
1 row in set (1.17 sec)
```
