cloud-fan commented on issue #18986: [SPARK-21774][SQL] The rule PromoteStrings should cast a string to double type when compare with a int/long URL: https://github.com/apache/spark/pull/18986#issuecomment-489684542 I don't think there is a perfect solution here. When comparing a string and a number, you have no idea which type we should cast the string to, without looking into the string content. For this specific case: `select '0.99' > 0`. I think returning null is more reasonable, as it's invalid to cast `"0.99"` to int type.
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