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### Is there an existing issue for this?
- [X] I have searched the existing issues
### Current Behavior
There is some weird behaviour when filtering columns on a dataframe produced by the exc…
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![WhatsApp Image 2022-09-22 at 9 46 59 AM](https://user-images.githubusercontent.com/112693798/191657473-36b3f418-e480-4abf-a6ad-aaf341bf71cd.jpeg)
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### 回表
回到主键索引树搜索的过程,称为回表。主要出现原因为查找的数据只有主键索引树上存在。
### 覆盖索引
如果索引覆盖了查询的需求,就叫覆盖索引,减少了树的搜索次数,避免了回表,能显著提升性能
### 最左前缀原则
只要满足索引的最左前缀,就可以使用该索引,这个最左前缀可以是联合索引的前 N 个字段,也可以是字符串索引的前 N 个字符
在建立联合索引时…
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### Bug Description
I am running an HTTP API server that uses SQLx for querying a MariaDB database. When I create a new database connection for every incoming request, I have no problems at all. Wh…
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### Is your feature request related to a problem or challenge?
I noticed an awesome SQL fuzzing framework [SQLancer](https://github.com/sqlancer/sqlancer/tree/main) can be implemented on DataFusion…
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**I'm submitting a ...**
- [ ] bug report
- [x] feature request
**Describe the issue**
Allow setting default collation for `varchar` comparisons and ordering on a connection level.
…
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**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
I have been evaluating Parquet and Arrow Datafusion for use at my company. While testing …
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Constructor params are discouraged, there's no real reason to let the user create an instance of the state himself. switchState() would take a Class.
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**Reported by @noaaroland on 5 Oct 2011 13:54 UTC**
Currently, the annotations can be opened separately with one button at the top of the interface to open and close all of the panels.
The most str…
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### Why
To run UPSERT from any catalog to a postgres database.
I think it could be a disruptive feature: it would be possible to use Trino to run ETL from data lake or any catalog to postgres, witho…