mgaido91 opened a new pull request #23726: [SPARK-26812][SQL] Report correct nullability for complex datatypes in Union URL: https://github.com/apache/spark/pull/23726 ## What changes were proposed in this pull request? When there is a `Union`, the reported output datatypes are the ones of the first plan and the nullability is updated according to all the plans. For complex types, though, the nullability of their elements is not updated using the types from the other plans. This means that the nullability of the inner elements is the one of the first plan. If this is not compatible with the one of other plans, errors can happen (as reported in the JIRA). The PR proposes to update the nullability of the inner elements of complex datatypes according to most permissive value of all the plans. ## How was this patch tested? added UT
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