Describes a getter and a setter for the a field property. Useful for expressions that contain an identifier to compare against.
getField( )
Returns the field name
Cake\Database\ExpressionInterface
setField( string|Cake\Database\ExpressionInterface $field )
Sets the field name
Cake\Database\ExpressionInterface
$field
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https://api.cakephp.org/3.5/class-Cake.Database.Expression.FieldInterface.html