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Hi,
We are encountering an issue where in delta table partition field value is returned as **NULL** by Presto query.
This results in presto queries which are based on the partitioned fields, retur…
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# 周报编写相关事宜
### 周报编写时间
每周二9：00 开会之前，编写周报时如果还没有创建，请按标题"YYYY-MM-DD 第X周周报"进行创建，并打上“周报”标签
### 周报格式
以姓名为标题,分“本周工作”，“下周工作"，“想说的话”三点进行阐述，内容自由发挥，切忌流水账，记录自己完成的工作，思考和分享，必要时给出具体的链接，重点内容加粗
### 周报示例
```…
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### 공식문서
* https://spark.apache.org/docs/2.4.0/api/sql/index.html#substr
### substring
* substring(str, pos[, len]) : 부분 문자열을 리턴한다. `pos`에서 시작해서 `len` 만큼의 길이의 부분 문자열을 리턴한다. 주의할 점은 `pos`가 1부터 시작…
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Edit: see this doc on functions supported by spark sql
https://spark.apache.org/docs/2.3.1/api/sql/index.html
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### Search before asking
- [X] I searched the [issues](https://github.com/sqlfluff/sqlfluff/issues) and found no similar issues.
### What Happened
I have a MariaDB table that uses generated column…
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### What kind an issue is this?
- [x] Bug report. If you’ve found a bug, please provide a code snippet or test to reproduce it below.
The easier it is to track down the bug, the faster …
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The keygenerator.class value set when using SparkSQL to create a table does not finally take effect in hoodie.properties
e.g: we want to set the value to 'ComplexKeyGenerator' but finally it is 'Si…
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Primary key constraints, though not directly enforced during data loading, are extremely valuable to the query planner and hence can substantially improve query performance, especially during joins.