snuyanzin opened a new pull request #17922:
URL: https://github.com/apache/flink/pull/17922
## What is the purpose of the change
There are some problem queries with misprints like
```sql
ELECT 1;
/*
comment
*/ SEECT 1;
```
Currently SQL client responses for such queries like `Non-query expression
encountered in illegal context`. For larger queries it could be a time
consuming task to understand what is wrong.
The PR is aimed to provide more info for such queries like exact unknown
token and start position. So it will help to faster detect issues. In fact this
info is already present in `SqlParseException` in `pos` field.
## Brief change log
In case of `SqlParseException` and message `Non-query expression encountered
in illegal context` extract and show `pos` info
## Verifying this change
There are tests added to
_flink-table/flink-sql-client/src/test/resources/sql/select.q_
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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