java.math.BigDecimal to Avro .avdl file

Question

I'm having trouble writing an Avro schema for java.math.BigDecimal type, I tried the following:

1. Based on Avro official doc , I know I need to define Logical Types myself to support BigDecimal, but that link gives example only in avsc, I'm trying to figure it out in avdl.
2. Based on Avro doc and this example , I wrote below avdl:

`

@namespace("test")
protocol My_Protocol_v1 {

  record BigDecimal {
        @java-class("java.math.BigDecimal") string value;
  }

`

But it's not working: This IDL schema compiles fine and can generate a Java class called BigDecimal, but I cannot really use the generated BigDecimal as java.math.BigDecimal, what's wrong? or How should I do it?

Thanks a lot

Answer 1

OK, so I emailed Apache Avro dev email list and got a response from Doug Cutting (Thanks a lot Doug).

I believe this has already been implemented but not yet released.

It was implemented in: https://issues.apache.org/jira/browse/AVRO-1847

This is slated to be included in the 1.8.2 release, which should soon be out.

Answer 2

Just to shed some light on how it works in the newer version:
We just started using rc4 of 1.8.2 and you can create BigDecimal fields with the following syntax:

record Thing {
    decimal(10,2) foo;
}

The Thing class will have a BigDecimal property foo with a precision of 10 and scale of 2.

Answer 3

即使编译器版本已更改为 1.8.2 版本，decimal(10,2) 也不会在 avsc 模式中生成十进制数据类型。