AngularJS filter with ternary operator expression

I have the following code:

<td data-ng-repeat="fld in checkedFields" ng-init="field = result[fld.field]; filter = fld.filter">
<span>
    {{ null != filter ? field | filter : field }}
</span>
</td>

I am getting the following console error

Error: [$parse:syntax] Syntax Error: Token '|' is unexpected, expecting [:] at column 24 of the expression [null != filter ? field | filter : field] starting at [| filter : field].

Does any know how to use AngularJS filter with ternary operator expression?