public RelSchemaProvider create(SystemStream systemStream, Config config) {
    return new ConfigBasedAvroRelSchemaProvider(systemStream, config);
  }
Avro Schema Resolver that uses static config to return a schema for a SystemStream.
Schemas are configured using the config of format {systemName}.{streamName}.schema.
samza-sql/src/main/java/org/apache/samza/sql/avro/ConfigBasedAvroRelSchemaProviderFactory.java