[jira] [Created] (HUDI-793) Avro schema for metadata fields is incorrect (no defaults)

["Alexander Filipchik (Jira)" <ji...@apache.org>]

Alexander Filipchik created HUDI-793:
----------------------------------------

             Summary: Avro schema for metadata fields is incorrect (no defaults)
                 Key: HUDI-793
                 URL: https://issues.apache.org/jira/browse/HUDI-793
             Project: Apache Hudi (incubating)
          Issue Type: Bug
            Reporter: Alexander Filipchik


HoodieAvroUtils adds hudi related fields to Avros: 
{code:java}
// Schema.Field commitTimeField =
    new Schema.Field(HoodieRecord.COMMIT_TIME_METADATA_FIELD, METADATA_FIELD_SCHEMA, "", (Object) null)
{code}
It generates: 
{code:java}
// "fields": [
  {
    "name": "_hoodie_commit_time",
    "type": [
      "null",
      "string"
    ],
    "doc": ""
  }
{code}
and it should generate:
{code:java}
// "fields": [
  {
    "name": "_hoodie_commit_time",
    "type": [
      "null",
      "string"
    ],
    "doc": "",
    "default": null  
}
{code}
"default": null is missing



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