alamb commented on code in PR #3547:
URL: https://github.com/apache/arrow-datafusion/pull/3547#discussion_r979830748
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datafusion/proto/proto/datafusion.proto:
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@@ -714,6 +714,9 @@ message Union{
}
message ScalarListValue{
+ // encode null explicitly to distinguish a list with a null value
+ // from a list with no values)
+ bool is_null = 3;
Review Comment:
The short answer is I don't know -- the longer answer is that the
`null_value` support at the scalar level requires a strange mirror type
(`PrimitiveScalarValue`) which doesn't quite have the same support for types as
the normal `DataType` -- I am working in the background to remove that
structure in https://github.com/apache/arrow-datafusion/pull/3612 and I will
also try to remove this explict null coding as well
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