uros-b commented on code in PR #57680:
URL: https://github.com/apache/spark/pull/57680#discussion_r3700471128
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercionHelper.scala:
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@@ -302,6 +302,35 @@ abstract class TypeCoercionHelper {
}
}
+ /** Whether `dt` is on the LTZ/NTZ timestamp fractional-precision axis (a
micro or nanos type). */
+ private def isTimestampFamily(dt: DataType): Boolean =
+ TimestampFamily.fractionalPrecision(dt).isDefined
+
+ /**
+ * Common operand type for [[SubtractTimestamps]] over two differing
timestamp-family operands.
Review Comment:
SubtractTimestamps class docs still only mention microsecond timestamps; a
short note that nanos are accepted (truncated to micros) would help.
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