0lai0 commented on code in PR #4693:
URL: https://github.com/apache/datafusion-comet/pull/4693#discussion_r3445796284
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spark/src/main/scala/org/apache/comet/serde/datetime.scala:
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@@ -289,13 +290,26 @@ object CometSecond extends CometExpressionSerde[Second]
with CodegenDispatchFall
}
}
+private[serde] object DatetimeCollation extends CometTypeShim {
+ def reason(functionName: String): String =
+ s"$functionName does not support non-UTF8_BINARY collations " +
+ "(https://github.com/apache/datafusion-comet/issues/4646)"
+
+ def hasNonDefaultCollation(expr: Expression): Boolean =
+ expr.children.exists(c => hasNonDefaultStringCollation(c.dataType))
+}
+
object CometUnixTimestamp extends CometExpressionSerde[UnixTimestamp] {
+ private val collationReason = DatetimeCollation.reason("unix_timestamp")
+
override def getUnsupportedReasons(): Seq[String] = Seq(
"Only `TimestampType` and `DateType` inputs are supported." +
" `TimestampNTZType` is not supported because Comet incorrectly applies
timezone" +
" conversion to TimestampNTZ values.")
+ override def getIncompatibleReasons(): Seq[String] = Seq(collationReason)
Review Comment:
Sure, makes sense! I will move it into `CometTypeShim` so the reason appears
only on 4.x, just as `hasNonDefaultStringCollation` is already shimmed.
I'll push an update shortly. Thanks for review
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