physinet opened a new pull request, #36545:
URL: https://github.com/apache/spark/pull/36545
### What changes were proposed in this pull request?
This PR modifies type inference for python lists to consider all values in
the list, not just the first value.
### Why are the changes needed?
This enables convenient type inference in the two following cases:
| | previous | current |
| --- | --- | --- |
| `[None, 1]` | `array<void>` (raises `ValueError`) | `array<bigint>` |
| `[{"b": 1}, {"c": 2}]` | `array<struct<b:bigint>>` |
`array<struct<b:bigint,c:bigint>>`
### Does this PR introduce _any_ user-facing change?
Possible user-facing changes:
* attempting to infer the schema of an array with mixed types (e.g. `["a",
1]`) may result in a TypeError
* previously, this was inferred as an `array<string>` and produced a
value `["a", "1"]`
* fields of inferred struct types will differ if dictionaries in an array
have different keys
### How was this patch tested?
Added unit tests for various cases.
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