[AVRO-1723] Add support for forward declarations in avro IDL - ASF JIRA

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Release Note:

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With this patch recursive data structures will be supported in IDL:

record SampleNode {
  int count = 0;
  array<SamplePair> samples = [];
}
record SamplePair {
string name;
SampleNode node;
}

Also the order of declaration of named types will not matter anymore. (similar with other languages like java)

Compatibility:

All schemas that are compilable with older versions of AVRO will continue working without issues.
IDLs that will take advantage of the the features introduced with this patch, will not be compilable with older versions of AVRO
please see the dependent JIRAs for more detail on related issues.

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With this patch recursive data structures will be supported in IDL: record SampleNode {   int count = 0;   array<SamplePair> samples = []; } record SamplePair { string name; SampleNode node; } Also the order of declaration of named types will not matter anymore. (similar with other languages like java) Compatibility: All schemas that are compilable with older versions of AVRO will continue working without issues. IDLs that will take advantage of the the features introduced with this patch, will not be compilable with older versions of AVRO please see the dependent JIRAs for more detail on related issues.
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