keltia commented on issue #18770:
URL: https://github.com/apache/datafusion/issues/18770#issuecomment-3570636931
In retrospect, I'm not sure about reading csv has the same behaviour, my bad.
As for json, I understand order of keys ought not to matter, but I have a
problem with A -> B -> C leading to C != A.
polars:
```text
❯ polars
Polars CLI version 0.9.0
Type .help for help.
〉select * from read_json('foo.json');
┌─────┬─────┬─────────┬─────┐
│ zzz ┆ bbb ┆ column1 ┆ abc │
│ --- ┆ --- ┆ --- ┆ --- │
│ i64 ┆ i64 ┆ i64 ┆ i64 │
╞═════╪═════╪═════════╪═════╡
│ 1 ┆ 2 ┆ 3 ┆ 4 │
│ 1 ┆ 2 ┆ 3 ┆ 4 │
│ 1 ┆ 2 ┆ 3 ┆ 4 │
└─────┴─────┴─────────┴─────┘
```
Even if keys are stored into a has as one would expect, hashes keep
insertion ordering so I did not expect the sorting to happen.
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