[jira] [Updated] (AVRO-3780) [Rust] Bug: decimal logical type usage through Fixed schema

["Martin Tzvetanov Grigorov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-3780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Tzvetanov Grigorov updated AVRO-3780:
--------------------------------------------
    Summary: [Rust] Bug: decimal logical type usage through Fixed schema  (was: [Rust] Bug: decimal logical type usage through Fixed)

> [Rust] Bug: decimal logical type usage through Fixed schema
> -----------------------------------------------------------
>
>                 Key: AVRO-3780
>                 URL: https://issues.apache.org/jira/browse/AVRO-3780
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: rust
>            Reporter: Fedor Telnov
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently, fixed type almost could not be used to represent decimal logical type.
> What am I trying to do is to parse such a schema:
> {code:json}
> {
>     "type": "record",
>     "name": "recordWithDecimal",
>     "fields": [
>         {
>             "name": "decimal",
>             "type":   {
>                  "type": "fixed",    "name": "nestedFixed",       "size": 8,   "logicalType": "decimal",     "precision": 4
>             }
>          }
>     ],
> }
> {code}
> It must be working if we strictly follow the avro specs. It does not work on master - you can see it through the test I supplied in the attached PR.
> Interestingly, such a thing works with bytes, so following schema works great:
> {code:json}
> {
>     "type": "record",
>     "name": "recordWithDecimal",
>     "fields": [
>     {
>         "name": "decimal",
>         "type":
>         {   "type": "bytes",   "name": "nestedFixed",      "logicalType": "decimal",     "precision": 4  }
>     }
>     ],
> }
> {code}
> And the only existing workaround is to extract decimal attributes to the field declaration, like so:
> {code:json}
> {
>     "name": "decimal",
>     "type":
>         {      "type": "fixed",     "name": "nestedFixed"    },
>      "size": 8,
>      "logicalType": "decimal",
>      "precision": 4
> }
> {code}
> Such a workaround should not be treated as an acceptable variant as it does not follow avro specification at all(I think, such a syntax is an extension, introduced in the Rust crate - correct me if I'm wrong).
>  
> I haven't investigated the roots yet, so any thoughts are welcome before I do it myself.
>  



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