AvroProject allows for reading specified portions of an Avro instance, and not the entire instance.
For example, take an Avro instance record with five fields: ID, First Name, Last Name, Phone Number, and Age.
To see just a few fields, such as First Name and Age, use AvroProject to project the source data into an Avro instance with a different schema composed of those fields.
Syntax
DATASET_STORAGE_FORMAT_AVRO_expression.AvroProject ( schema_expression )