scovich commented on code in PR #8140:
URL: https://github.com/apache/arrow-rs/pull/8140#discussion_r2277293501
##########
parquet-variant/src/variant.rs:
##########
@@ -1286,6 +1286,77 @@ impl TryFrom<(i128, u8)> for Variant<'_, '_> {
}
}
+// helper to print <invalid> instead of "<invalid>" in debug mode when a
VariantObject or VariantList contains invalid values.
+struct InvalidVariant;
+
+impl std::fmt::Debug for InvalidVariant {
Review Comment:
That's what I had at first, but it would print e.g.
```
{
"invalid": "invalid",
}
```
Since `"invalid": "invalid"` is valid JSON, it seemed better to have
something unambiguous:
```
{
<invalid>: <invalid>,
}
```
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