presto-main/src/main/java/io/prestosql/operator/project/PageFieldsToInputParametersRewriter.java/PageFieldsToInputParametersRewriter/rewritePageFieldsToInputParameters
class PageFieldsToInputParametersRewriter:    public static Result rewritePageFieldsToInputParameters(RowExpression expression)
    {
        Visitor visitor = new Visitor();
        RowExpression rewrittenProjection = expression.accept(visitor, null);
        InputChannels inputChannels = new InputChannels(visitor.getInputChannels());
        return new Result(rewrittenProjection, inputChannels);
    }