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https://issues.apache.org/jira/browse/AVRO-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968798#comment-13968798
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Ryan Blue commented on AVRO-1402:
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[~xuefuz], what I'm trying to say is that it's an error if the underlying type
cannot fit the precision the user expects. And because that underlying type
can't be changed, we should avoid mistakes by making the precision required so
we can check as soon as possible and before data is written.
To your point about changing the value to fit the storage, that may be fine for
Hive but I think a data storage format shouldn't change the data. Storing a
decimal(5,2) in a decimal(4,1) discards data and requires a rounding policy, so
it should be treated as an error if Avro is handling the encoding. If Hive is
encoding the decimal, then the decision is left up to Hive.
> Support for DECIMAL type
> ------------------------
>
> Key: AVRO-1402
> URL: https://issues.apache.org/jira/browse/AVRO-1402
> Project: Avro
> Issue Type: New Feature
> Affects Versions: 1.7.5
> Reporter: Mariano Dominguez
> Assignee: Tom White
> Priority: Minor
> Labels: Hive
> Fix For: 1.7.7
>
> Attachments: AVRO-1402-logical-type-spec-2.patch,
> AVRO-1402-logical-type-spec-3.patch, AVRO-1402-logical-type-spec-4.patch,
> AVRO-1402-logical-type-spec.patch, AVRO-1402.patch, AVRO-1402.patch,
> AVRO-1402.patch, AVRO-1402.patch, UnixEpochRecordMapping.patch
>
>
> Currently, Avro does not seem to support a DECIMAL type or equivalent.
> http://avro.apache.org/docs/1.7.5/spec.html#schema_primitive
> Adding DECIMAL support would be particularly interesting when converting
> types from Avro to Hive, since DECIMAL is already a supported data type in
> Hive (0.11.0).
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