Fix Avro adapter handling nullable values

[stloyd]

Change Log

Added

Fixed

• Fix Avro adapter handling nullable values

Changed

Removed

Deprecated

Security

---

Description

Without this fix adjusted test for Avro fails:

There was 1 error:

1) Flow\ETL\Adapter\Avro\Tests\Integration\AvroTest::test_writing_and_reading_avro_with_all_supported_types
AvroIOTypeException: The datum array (
  'integer' => 10,
  'float' => 1.5,
  'string' => NULL,
  'boolean' => true,
  'datetime' => 1697475815694710,
  'json_object' => '{"id":1,"name":"test"}',
  'json' => '[{"id":1,"name":"test"},{"id":2,"name":"test"}]',
  'list_of_strings' => 
  array (
    0 => 'a',
    1 => 'b',
    2 => 'c',
  ),
  'list_of_datetimes' => 
  array (
    0 => 1697475815694711,
    1 => 1697475815694712,
    2 => 1697475815694712,
  ),
  'address' => 
  array (
    'street' => 'street_10',
    'city' => 'city_10',
    'zip' => 'zip_10',
    'country' => 'country_10',
    'location' => 
    array (
      'lat' => 1.5,
      'lon' => 1.5,
    ),
  ),
) is not an example of schema {"type":"record","name":"row","fields":[{"name":"integer","type":{"type":"int"}},{"name":"float","type":{"type":"float"}},{"name":"string","type":{"type":"string"}},{"name":"boolean","type":{"type":"boolean"}},{"name":"datetime","type":{"type":"long"},"logicalType":"timestamp-micros"},{"name":"json_object","type":{"type":"string"}},{"name":"json","type":{"type":"string"}},{"name":"list_of_strings","type":{"type":"array","items":{"type":"string"}}},{"name":"list_of_datetimes","type":{"type":"array","items":{"type":"long"},"logicalType":"timestamp-micros"}},{"name":"address","type":{"type":"record","name":"Address","fields":[{"name":"street","type":{"type":"string"}},{"name":"city","type":{"type":"string"}},{"name":"zip","type":{"type":"string"}},{"name":"country","type":{"type":"string"}},{"name":"location","type":{"type":"record","name":"Location","fields":[{"name":"lat","type":{"type":"float"}},{"name":"lon","type":{"type":"float"}}]}}]}}]}

/Users/stloyd/Documents/flow/vendor/flix-tech/avro-php/lib/avro/datum.php:101
/Users/stloyd/Documents/flow/vendor/flix-tech/avro-php/lib/avro/datum.php:147
/Users/stloyd/Documents/flow/vendor/flix-tech/avro-php/lib/avro/data_file.php:543
/Users/stloyd/Documents/flow/src/adapter/etl-adapter-avro/src/Flow/ETL/Adapter/Avro/FlixTech/AvroLoader.php:98
/Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/Pipeline/SynchronousPipeline.php:81
/Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/DataFrame.php:582
/Users/stloyd/Documents/flow/src/adapter/etl-adapter-avro/tests/Flow/ETL/Adapter/Avro/Tests/Integration/AvroTest.php:135