Github user dilipbiswal commented on the issue:
https://github.com/apache/spark/pull/22408
@maropu This is the case we were discussing for which @ueshin suggested
using `findWiderTypeWithoutStringPromotion`. Lets see what @cloud-fan and
@gatorsmile think and we will do accordingly. We are picking a much restrictive
cast (since we are injecting this implicitly).
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