kmitchener opened a new issue, #5041:
URL: https://github.com/apache/arrow-datafusion/issues/5041
**Describe the bug**
Inferring the schema does not work with a compressed file, in some cases.
**To Reproduce**
Create a file like this one, and gzip it:
```
❯ cat file1.csv
Region,Units
United States,10
Canada,20
United States,10
Canada,20
United States,10
Canada,20
Canada,20
❯ gzip file1.csv
```
I couldn't duplicate this error with a gzipped file of exact repeating rows.
It requires some variation in the rows (or there's something else that triggers
it).
Then attempt to make a table from it:
```
❯ create external table file_csv stored as csv with header row compression
type gzip location './file1.csv.gz';
ArrowError(CsvError("corrupt deflate stream"))
```
**Expected behavior**
It shouldn't throw an error and should be able to create the external table.
**Additional context**
It works fine with the same file if you specify the table schema:
```
❯ create external table file_csv(a string,b int) stored as csv with header
row compression type gzip location './file1.c
sv.gz';
0 rows in set. Query took 0.000 seconds.
❯ select * from file_csv;
+---------------+----+
| a | b |
+---------------+----+
| United States | 10 |
| Canada | 20 |
| United States | 10 |
| Canada | 20 |
| United States | 10 |
| Canada | 20 |
| Canada | 20 |
+---------------+----+
7 rows in set. Query took 0.003 seconds.
```
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