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[SPARK-25833][SQL][DOCS] Update migration guide for Hive view compati…
…bility ## What changes were proposed in this pull request? Both Spark and Hive support views. However in some cases views created by Hive are not readable by Spark. For example, if column aliases are not specified in view definition queries, both Spark and Hive will generate alias names, but in different ways. In order for Spark to be able to read views created by Hive, users should explicitly specify column aliases in view definition queries. Given that it's not uncommon that Hive and Spark are used together in enterprise data warehouse, this PR aims to explicitly describe this compatibility issue to help users troubleshoot this issue easily. ## How was this patch tested? Docs are manually generated and checked locally. ``` SKIP_API=1 jekyll serve ``` Closes #22868 from seancxmao/SPARK-25833. Authored-by: seancxmao <seancxmao@gmail.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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