Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20024
I feel it's not the most effcient way to cast array to string by
deserializing the catalyst array to java array. Instead, I think we should have
a schema-aware string casting function, i.e. using `ArrayData.get` to get each
element, and recursively cast each element to string, and concat them with `,`
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