Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/16954#discussion_r103339031 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala --- @@ -109,6 +109,26 @@ object TypeCoercion { } /** + * This function determines the target type of a comparison operator when one operand + * is a String and the other is not. It also handles when one op is a Date and the + * other is a Timestamp by making the target type to be String. Currently this is used + * to coerce types between LHS and RHS of the IN expression. + */ + val findCommonTypeForBinaryComparison: (DataType, DataType) => Option[DataType] = { + case (StringType, DateType) => Some(StringType) + case (DateType, StringType) => Some(StringType) + case (StringType, TimestampType) => Some(StringType) + case (TimestampType, StringType) => Some(StringType) + case (TimestampType, DateType) => Some(StringType) --- End diff -- This seems weird. Is this also the current behavior?
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