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https://issues.apache.org/jira/browse/AVRO-2864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oscar Westra van Holthe - Kind resolved AVRO-2864.
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Resolution: Information Provided
> IDL does not fully support arbitrary logical types
> --------------------------------------------------
>
> Key: AVRO-2864
> URL: https://issues.apache.org/jira/browse/AVRO-2864
> Project: Apache Avro
> Issue Type: Bug
> Reporter: Roger
> Priority: Major
>
> There seems to be no way to specify a logical type other than the ones built
> in to IDL (decimal, date, time-millis, timestamp-millis) when the type is not
> used at the top level in a field.
> For example, it is not possible to specify an array of long with logical type
> timestamp-micros.
> If you do:
> {code:none}
> protocol _ {
> record R {
> @logicalType("timestamp-micros")
> array<long> times;
> }
> }
> }
> {code}
> the "logicalType" attribute will be associated with the array type and not
> the element type.
> The resulting AVSC (as converted by the idl2schemata tool) looks like this:
> {code:json}
> {
> "type" : "record",
> "name" : "R",
> "fields" : [ {
> "name" : "times",
> "type" : {
> "type" : "array",
> "items" : "long",
> "logicalType" : "timestamp-micros"
> }
> } ]
> }
> {code}
> I would expect the logical type to be associated with the element type, but
> even if the tool is changed to do that, it's still not complete, because
> there's no way to associate a logical type with a member of a union.
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