public void setFunctions(java.util.Collection<String> functions) {
        if (functions == null) {
            this.functions = null;
            return;
        }

        this.functions = new java.util.ArrayList<String>(functions);
    }
<p>
A list of <code>Function</code> objects.
</p>

@param functions
       A list of <code>Function</code> objects.
aws-java-sdk-appsync/src/main/java/com/amazonaws/services/appsync/model/PipelineConfig.java