* [Bug] Fix some bugs of load job scheduler
1. The fix load meta bug logic should be removed since 0.12.
2. The load task thread pool's waiting queue should be as long as desired pending jobs num.
3. Submit the load task outside database lock to prevent holding lock for long time.
* Update fe-idea-dev.md
use `brew install thrift@0.9` to install thrift 0.9.3.1
`brew edit thrift090 | head` shows thrift@0.9 uses thrift 0.9.3.1
* [Refactor] Remove the unnecessary if statement
Future<?> submit(Runnable task)
Submits a Runnable task for execution and returns a Future representing that task. The Future's get method will return null upon successful completion.
When `Load Job Task Queue` is filled, continue to submit more jobs to the queue will cause
`RejectedExecutionException`.
But `callback.onTaskFailed` function does not catch the exception, that will cause
re-submitting job failed, and status is not updated to failed.
issue: #4795
SQL like:
`select a join b union select c join d`;
if a b is colocate join, and c d is also colocate join, the query may failed
with error like:
`failed to get tablet. tablet_id=26846, with schema_hash=398972982, reason=tablet does not exist`
1. Add a search boxer in the left tree view of Playground.
2. Fix some visual bugs of UI.
3. Fix bugs that link failed in QueryProfile view.
4. Fix bugs that cookie is always invalid.
5. Set cookie to HTTP_ONLY to make it more safe.
`select day from test where day='2020-10-32'`
table 'test' is parititioned by day. In this case, '2020-10-32' will be taken as CastExpr not LiteralExpr,
and condition "day='2020-10-32'" will not be recognized as partitionfilter.
This case will scan all partitions. To avoid scall all partitions, it is better to filter invalid date value.
issue: #4755
1.
When we decommission some BEs with SSD disks,
if there are no SSD disks on the remaining BEs, it will be impossible to select a suitable destination path.
In this case, we need to ignore the storage medium property and try to select the destination path again.
Set `isSupplement` to true will ignore the storage medium property.
2.
When the BE nodes where all replicas of a tablet are located are decommission,
and this task is a VERSION_INCOMPLETE task.
This will lead to failure to select a suitable dest replica.
At this time, we should try to convert this task to a REPLICA_MISSING task, and schedule it again.
Support persistence of configuration items modified at runtime via HTTP API.
```
FE:
GET /api/_set_config?key=value&persist=true
BE
POST /api/update_config?key=value&persist=true
```
The modified config will be saved in `fe_custom.conf` or `be_custom.conf`.
And when process starts, it will load `fe.conf/be.conf` first, then `fe_custom.conf/be_custom.conf`.
Thread [Connect-Scheduler-Check-Timer] fail to iterate the connectionMap , because other threads will modify the connectionMap at the same time.
Fe's connection which is timed out can't be released because of thread [Connect-Scheduler-Check-Timer] not working.
If the materialized slot is empty in inline view, the scanner will throw exception 'no materialized slot!'.
When the outer query does not need any real columns of the inner query at all, such as the outer query only contains constant calculations,
all slots in the inner query will not be materialized.
For example:
```
select c1 from (select 'xx' c1, k1 from test) t1;
```
But this does not mean that the inner query (select 'xx' c1, k1 from test) does not need to be executed.
Because the number of rows in the outer result needs to be determined by the number of rows in the inner query.
In this case, the inner query scan node needs to add a column to ensure the correct result.
At the same time it can avoid the scan node reporting errors.
At present, when some rpc errors occur, the client cannot obtain the error information well.
And this CL change the RPC error returned to client like this:
```
ERROR 1064 (HY000): errCode = 2, detailMessage = there is no scanNode Backend. [10002: in black list(A error
occurred: errorCode=2001 errorMessage:Channel inactive error!)]
ERROR 1064 (HY000): failed to send brpc batch, error=The server is overcrowded, error_text=[E1011]The server is
overcrowded @xx.xx.xx.xx:8060 [R1][E1011]The server is overcrowded @xx.xx.xx.xx:8060 [R2][E1011]The server is
overcrowded @xx.xx.xx.xx:8060 [R3][E1011]The server is overcrowded @xx.xx.xx.xx:8060, client: yy.yy.yy.yy
```
This is the last PR of proposal #4308
1. Add a new FE config `enable_http_server_v2` to enable new HTTP Server implementation. The default value is false.
2. Add a new FE config `http_api_extra_base_path` so that we can set base path for Frontend UI.
3. Refactor the new HTTP API response body. The return http status code is always 200, and using internal code in response body to indicate the certain error.
1. Support limit clause push down both odbc table and mysql table.
2. Code refactor of ODBC Scan Node, change `build_connect_string` and `query_string` from BE to FE to make it easily to modify
Support new synatx CREATE TABLE [IF NOT EXISTS] [db_name].table_name AS [db_name2].table_name2;
to create a new table from existed table with same table schema.
ISSUE: #4355
Fix#4692
The reason of this bug is case-when statement may produce implicit CastExpr<SlotRef>
as SelectListItem in analyze step.
And these CastExpr<SlotRef> in SelectList will not be re-anlyze after rewrite step,
which will result in the incorrect number of self-incrementing SlotDescriptor ID in resultExprs .
So we need to reset the analysis state of CastExpr<SlotRef> in rewrite step.
