heyihong commented on code in PR #52270:
URL: https://github.com/apache/spark/pull/52270#discussion_r2337232144
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sql/connect/common/src/main/scala/org/apache/spark/sql/connect/common/LiteralValueProtoConverter.scala:
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@@ -434,11 +434,18 @@ object LiteralValueProtoConverter {
case proto.DataType.KindCase.BOOLEAN => v => v.getBoolean
case proto.DataType.KindCase.STRING => v => v.getString
case proto.DataType.KindCase.BINARY => v => v.getBinary.toByteArray
- case proto.DataType.KindCase.DATE => v => v.getDate
- case proto.DataType.KindCase.TIMESTAMP => v => v.getTimestamp
- case proto.DataType.KindCase.TIMESTAMP_NTZ => v => v.getTimestampNtz
- case proto.DataType.KindCase.DAY_TIME_INTERVAL => v =>
v.getDayTimeInterval
- case proto.DataType.KindCase.YEAR_MONTH_INTERVAL => v =>
v.getYearMonthInterval
+ case proto.DataType.KindCase.DATE =>
+ v => SparkDateTimeUtils.toJavaDate(v.getDate)
Review Comment:
@cloud-fan The client side does not know how to convert external Java
objects into internal Catalyst values if I understand correctly. The conversion
occurs
[here](https://github.com/apache/spark/blob/master/sql/connect/common/src/main/scala/org/apache/spark/sql/connect/common/LiteralValueProtoConverter.scala#L135-L152)
in LiteralValueProtoConverter and the server just converts the Proto value
back to the Java object.
This code path is also needed in the Scala client, since the client may need
to convert temporal values from proto observed metrics into Java objects.
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