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Type logique d'horodatage de l'API Java d'Avro?

Avec l'API Java d'Avro, je peux créer un schéma d'enregistrement simple comme:

    Schema schemaWithTimestamp = SchemaBuilder
            .record("MyRecord").namespace("org.demo")
            .fields()
            .name("timestamp").type().longType().noDefault()
            .endRecord();

Comment marquer un champ de schéma avec un type logique, en particulier: https://avro.Apache.org/docs/1.8.1/api/Java/org/Apache/avro/LogicalTypes.TimestampMillis.html

javatimeavro
6
clay

Merci à DontPanic:

    Schema timestampMilliType = LogicalTypes.timestampMillis().addToSchema(Schema.create(Schema.Type.LONG));

    Schema schemaWithTimestamp = SchemaBuilder
            .record("MyRecord").namespace("org.demo")
            .fields()
            .name("timestamp_with_logical_type").type(timestampMilliType).noDefault()
            .name("timestamp_no_logical_type").type().longType().noDefault()
            .endRecord();

    System.out.println(schemaWithTimestamp.toString(true));

Cela se traduit par:

{
  "type" : "record",
  "name" : "MyRecord",
  "namespace" : "org.demo",
  "fields" : [ {
    "name" : "timestamp_with_logical_type",
    "type" : {
      "type" : "long",
      "logicalType" : "timestamp-millis"
    }
  }, {
    "name" : "timestamp_no_logical_type",
    "type" : "long"
  } ]
}
10
clay

Je pense que vous pouvez créer le schéma manuellement:

List<Schema.Field> fields = new ArrayList<>();
Schema timeStampField = Schema.create(Schema.Type.LONG);
fields.add(new Schema.Field("timestamp", LogicalTypes.timestampMillis().addToSchema(timeStampField), null, null));
Schema resultSchema = Schema.createRecord("MyRecord", null, "org.demo", false, fields);
System.out.println(resultSchema);

votre schéma:

{"type":"record","name":"MyRecord","namespace":"org.demo","fields":[{"name":"timestamp","type":"long"}]}

resultSchema avec timestampMillis:

{"type":"record","name":"MyRecodr","namespace":"org.demo","fields":[{"name":"timestamp","type":{"type":"long","logicalType":"timestamp-millis"}}]}
2
DontPanic