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https://issues.apache.org/jira/browse/AVRO-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858337#comment-15858337
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Ben McCann commented on AVRO-1505:
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Can we remove the "Fix Version/s: 1.7.8"? It seems like this would be better
targeted towards master than the 1.7 branch
> Generic comparator features definable in avro schema
> ----------------------------------------------------
>
> Key: AVRO-1505
> URL: https://issues.apache.org/jira/browse/AVRO-1505
> Project: Avro
> Issue Type: New Feature
> Components: java
> Affects Versions: 1.7.6
> Environment: same as for hadoop 2.3.0
> Reporter: Dr. Martin Menzel
> Priority: Minor
> Labels: patch
> Fix For: 1.7.8
>
> Attachments: AVRO-1505.patch.gz, CompoundDataExportKeyExtended2.avsc,
> GenericComparator.java, GenericData.java, TestGenericComparator.java
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> This patch allows to add additional optional comparator informations to the
> avro schema for record types.
> An example is included in the patch
> CompoundDataExportKeyExtended2.avsc
> ...snip...
> {"name": "seqNo", "type": "int", "comparators" : [
> {
> "name":"default", "compareIdx" : 3, "order":"ascending" },
> {
> "name":"grouping1", "compareIdx" : 3, "order":"ignore" } ,
> {
> "name":"grouping2", "compareIdx" : 3, "order":"ignore" }
> ]},
> ...snip...
> in the comparators property of a field definition multiple compartor
> informations can be defined. Often used when defining GroupingCompartors with
> compound keys is order="ignore" so that the keys are just compared with
> respect to some special (not ignored fields)
> The necessary changes are made in GenericData class with a fall back to the
> standard behavior if no comparators are defined.
> An example generic Compartor is delivered with this patch called:
> org.woopi.avro.GenericComparator
> Maybe this class can be included in the avro bundle. In this case the package
> can be adapted to org.apache.
> The TestCase tests several different situations and is called.
> TestGenericComparator.java
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