FieldsInJavaAPIs

• A comma-separated list of field names (Use the REST API:field Resource to get a complete list of fields.)
• The asterisk ("*") wildcard specifies all fields.
• For related-record fields in a Composite Object, specify the alias of the related object and the field name, where the alias is defined in the Object Relationships:

alias[.alias...].* or alias[.alias...].field

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