klion26 commented on issue #8091:
URL: https://github.com/apache/arrow-rs/issues/8091#issuecomment-3182305945
I'm trying to support this by enhancing the existing macro like below
- add one more rule for the `VariantArray::value`
- change the existing rule(add `builder => ` in the existing rule)
```
#[macro_export]
macro_rules! cast_conversion {
($t:ty, $method:ident, $cast_fn:expr, $input:expr, builder =>
$builder:expr) => {{
let array = $input.$method::<$t>();
for i in 0..array.len() {
if array.is_null(i) {
$builder.append_null();
continue;
}
let cast_value = $cast_fn(array.value(i));
$builder.append_variant(Variant::from(cast_value));
}
}};
($t:ty, $method:ident, $cast_fn:expr, $input:expr, index => $index:expr)
=> {{
let array = $input.$method::<$t>();
let cast_value = $cast_fn(array.value($index));
Variant::from(cast_value)
}};
}
```
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