BePPPower opened a new pull request, #13959:
URL: https://github.com/apache/doris/pull/13959
# Proposed changes
Issue Number: close #10217
pr Number: close #10214
This pr does three things：
1. Modified the framework of table-valued-function(tvf).
2. be support `fetch_table_schema` rpc.
3. Implemented `S3(path, AK, SK, format)` table-valued-function.
## Problem summary
1. Modified the framework of table-valued-function(tvf).
Each implementation of tvf requires a new `scan node` in the old framework
of pr #10214 . Actually, different `scan nodes` should correspond to different
data sources. I modified the tvf framework so that it can generate different
`scan node` according to data source of this tvf.
For example, the data of `numbers(n,m)` tvf is derived from memory, so it
generate `DataGenScanNode`. And the data of `s3(...)` tvf is derived from S3
Storage, so it generate `ExternalFileScanNode`.
2. be support `fetch_table_schema` rpc.
There is no table schema in `s3()` advance, so we need `fetch_table_schema`
rpc to parse table schema from file in S3 Storage.
3. `S3(path, AK, SK, format)`
The initial implement of `s3(..)` tvf, use like:
```
MySQL [(none)]> select * from s3("http://127.0.0.1:9312/test2/student1.csv";,
"minioadmin", "minioadmin", "csv");
+------+------+------+
| c1 | c2 | c3 |
+------+------+------+
| 1 | ftw | 12 |
| 2 | zs | 18 |
| 3 | ww | 20 |
+------+------+------+
3 rows in set (0.04 sec)
MySQL [(none)]> select * from
s3("http://127.0.0.1:9312/test2/student_with_names.csv";, "minioadmin",
"minioadmin", "csv_with_names");
+------+------+------+
| id | name | age |
+------+------+------+
| 1 | ftw | 12 |
| 2 | zs | 18 |
| 3 | ww | 20 |
+------+------+------+
3 rows in set (0.04 sec)
```
## Checklist(Required)
1. Does it affect the original behavior:
- [x] Yes
- [ ] No
- [ ] I don't know
5. Has unit tests been added:
- [ ] Yes
- [x] No
- [ ] No Need
6. Has document been added or modified:
- [ ] Yes
- [x] No
- [ ] No Need
7. Does it need to update dependencies:
- [ ] Yes
- [x] No
8. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [x] No
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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