Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19249 Thanks for double checking @ueshin. Yes, I noticed that too while reviewing it. I just decided to merge it as is because I am quite sure of this one given struct type is the root type and this case looks quite common, and regarding that it looks the first contribution. Even though this one has a downside, practically the improvement looked better. I am also fine with doing this for others too (I am +0 for other types).
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