FieldsInJavaAPIs

• A comma-separated list of field names
• The asterisk ("*") wildcard specifies all fields

(Use the REST API:field Resource to get a complete list of fields.)

• For related-record fields in a Composite Object, specify the alias of the related object and the field name:
  

{aliasName}.{fieldName}.

When fetched, the alias becomes a "field" that contains an array of records from the related object, where each record contains the specified field(s).

alias.* specifies all fields in the related object.