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Posted to dev@avro.apache.org by "Christophe Taton (JIRA)" <ji...@apache.org> on 2013/05/23 07:13:20 UTC
[jira] [Updated] (AVRO-1338) Rewrite records with a reader schema
different from the writer schema without losing fields from writer schema.
[ https://issues.apache.org/jira/browse/AVRO-1338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Christophe Taton updated AVRO-1338:
-----------------------------------
Description:
Record R is written using schema S1: {{ record Record { int i = 0 } }}
I read R using a my own reader schema S2: {{ record Record { string s = "" } }}
Rewriting R using S2 will discard fields from S1 that are unknown in S2 (that is Record.i is lost).
Ideally, there would be a way to maintain fields from S1 that are invisible through S2.
Writing R back without such loss implies merging S1 and S2 into a single schema that contains all fields from S1 and all fields from S2.
was:
Record R is written using schema S1 = record Record { int i = 0 }.
I read R using a my own reader schema S2 = record Record { string s = "" }.
Rewriting R using S2 will discard fields from S1 that are unknown in S2 (that is Record.i is lost).
Ideally, there would be a way to maintain fields from S1 that are invisible through S2.
Writing R back without such loss implies merging S1 and S2 into a single schema that contains all fields from S1 and all fields from S2.
> Rewrite records with a reader schema different from the writer schema without losing fields from writer schema.
> ---------------------------------------------------------------------------------------------------------------
>
> Key: AVRO-1338
> URL: https://issues.apache.org/jira/browse/AVRO-1338
> Project: Avro
> Issue Type: New Feature
> Components: java
> Affects Versions: 1.7.2
> Reporter: Christophe Taton
>
> Record R is written using schema S1: {{ record Record { int i = 0 } }}
> I read R using a my own reader schema S2: {{ record Record { string s = "" } }}
> Rewriting R using S2 will discard fields from S1 that are unknown in S2 (that is Record.i is lost).
> Ideally, there would be a way to maintain fields from S1 that are invisible through S2.
> Writing R back without such loss implies merging S1 and S2 into a single schema that contains all fields from S1 and all fields from S2.
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