HyukjinKwon commented on a change in pull request #24567: [SPARK-27638][SQL]:
date format 'yyyy-M-dd' string comparison not handled properly
URL: https://github.com/apache/spark/pull/24567#discussion_r282500625
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
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@@ -123,8 +123,8 @@ object TypeCoercion {
// We should cast all relative timestamp/date/string comparison into
string comparisons
// This behaves as a user would expect because timestamp strings sort
lexicographically.
// i.e. TimeStamp(2013-01-01 00:00 ...) < "2014" = true
- case (StringType, DateType) => Some(StringType)
- case (DateType, StringType) => Some(StringType)
+ case (StringType, DateType) => Some(DateType)
+ case (DateType, StringType) => Some(DateType)
Review comment:
Doesn't this mean we always find the common type as date when any arbitrary
strings are compared to any dates?
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