tustvold opened a new issue #1736:
URL: https://github.com/apache/arrow-datafusion/issues/1736
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
I wrote a test approximating
```
let file = tempfile::tempfile();
// ... write parquet data ...
let mut context = ExecutionContext::new();
context.register_parquet("t", file.path().as_str())
context.sql("select column from t");
```
This would result in "Invalid identifier" errors, effectively claiming the
column didn't exist. I verified the file existed, had the correct columns,
etc... I was very confused :laughing:
Eventually I tracked this down to the schema being inferred as empty if the
extension is not ".parquet", this feels unexpected
**Describe the solution you'd like**
Either "register_parquet" should return an error if the extension is
missing, or `FileFormat::infer_schema` should be more agnostic to file
extensions.
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