Contains the field property with a getter and a setter for it
$_field
protected getField( )
Returns the field name
Cake\Database\ExpressionInterface
setField( string|Cake\Database\ExpressionInterface $field )
Sets the field name
Cake\Database\ExpressionInterface
$field
protected string|Cake\Database\ExpressionInterface
The field name or expression to be used in the left hand side of the operator
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https://api.cakephp.org/3.5/class-Cake.Database.Expression.FieldTrait.html