crepererum commented on code in PR #7870:
URL: https://github.com/apache/arrow-datafusion/pull/7870#discussion_r1372786446
##########
datafusion/common/src/dfschema.rs:
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@@ -102,8 +217,12 @@ impl DFSchema {
));
}
}
+
+ let fields_index = build_index(&fields);
Review Comment:
Thinking about this more: instead of `RwLock`, this can be solved even more
elegantly w/
[`OnceLock::get_or_init`](https://doc.rust-lang.org/std/sync/struct.OnceLock.html#method.get_or_init)
(this is usually used for static variables, but you can totally use that for
struct members as well).
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