jiangxb1987 opened a new pull request #25425: [SPARK-28497][FOLLOWUP][SQL] Allow cast NullType to StringType URL: https://github.com/apache/spark/pull/25425 ## What changes were proposed in this pull request? #25242 proposed to disallow upcasting complex data types to string type, however, upcasting from null type to string type should still be safe. ## How was this patch tested? Add corresponding case in `CastSuite`.
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