Cannot parse schema containing array of non-primitive types

[emlyn]

When I try to build the following schema from JSON:

  [<Fact>]
  let ``Array of records builds`` () =
    JsonSchemaBuilder().BuildSchema("""
{
  "type": "record",
  "name": "OuterRecord",
  "namespace": "test.namespace",
  "fields": [
    {
      "name": "arrField",
      "type": "array",
      "items": {
        "name": "recField",
        "type": {
          "type": "record",
          "name": "InnerRecord",
          "namespace": "test.namespace",
          "fields": [
            {
              "name": "intField",
              "type": "int"
            }
          ]
        }
      }
    }
  ]
}""")

it fails with the following stack trace:

[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5470977]       System.Collections.Generic.KeyNotFoundException : The given key was not present in the dictionary.
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5477750]       Stack Trace:
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5484813]            at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5485430]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.CreatePrimitiveTypeSchema(String type, Dictionary`2 attributes)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5485956]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.Parse(JToken token, NamedSchema parent, Dictionary`2 namedSchemas)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5486442]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.ParseRecordField(JObject field, NamedSchema parent, Dictionary`2 namedSchemas, Int32 position)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5487017]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.<>c__DisplayClass9_0.<ParseRecordType>b__0(JToken field, Int32 index)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5487472]            at System.Linq.Enumerable.<SelectIterator>d__5`2.MoveNext()
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5487888]            at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5488318]            at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5488812]            at Microsoft.Hadoop.Avro.Schema.JsonExtensions.ReadArrayProperty[T](JToken token, String propertyName, Boolean isOptional, Func`3 func)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5489228]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.ParseRecordType(JObject record, NamedSchema parent, Dictionary`2 namedSchemas)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5489725]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.ParseJsonObject(JObject token, NamedSchema parent, Dictionary`2 namedSchemas)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5490233]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.Parse(JToken token, NamedSchema parent, Dictionary`2 namedSchemas)
[20/11/2018 09:42:37 Informational] [xUnit.net 00:00:01.5490674]            at Microsoft.Hadoop.Avro.Schema.JsonSchemaBuilder.BuildSchema(String schema)