edponce commented on a change in pull request #12517:
URL: https://github.com/apache/arrow/pull/12517#discussion_r818100195
##########
File path: cpp/src/arrow/compute/kernels/scalar_cast_nested.cc
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@@ -84,6 +84,13 @@ struct CastList {
options,
ctx->exec_context()));
out_scalar->is_valid = true;
+
+ if (is_fixed_size_list_type<DestType>::value) {
Review comment:
Normally, we do not use SFINAE aliases for declarative runtime checks
```c++
if (out_scalar->type->id() == Type::FIXED_SIZE_LIST) { ... }
```
Nevertheless, the code is not reaching the Scalar block (from pyarrow) bc
Scalar cast does not works (see [JIRA
comment](https://issues.apache.org/jira/browse/ARROW-15455?focusedCommentId=17500385&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17500385)).
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