[jira] [Created] (AVRO-2033) GenericUnions constructor defaults to a broken state

["Philip Rizk (JIRA)" <ji...@apache.org>]

Philip Rizk created AVRO-2033:
---------------------------------

             Summary: GenericUnions constructor defaults to a broken state
                 Key: AVRO-2033
                 URL: https://issues.apache.org/jira/browse/AVRO-2033
             Project: Avro
          Issue Type: Bug
          Components: c++
    Affects Versions: 1.7.7
            Reporter: Philip Rizk
            Priority: Minor


Creating a GenericUnion with a NodePtr results in an object that causes errors when written. Specifically the index for the union type will be invalid. This will only be caught when reading the serialized record. 


The issue is the consturctor:
{code}
   GenericUnion(const NodePtr& schema) :
        GenericContainer(AVRO_UNION, schema), curBranch_(schema->leaves()) {
{code}

Setting curBranch_ to schema->leaves() will result in setting the value to an invalid index (one more than available. I believe the constructor in question should be changed to: 

{code}
  GenericContainer(AVRO_UNION, schema), curBranch_(0) {
{code}

This should ensure the union is set to the default branch. 






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