@Override
public FilterPushdownScubaSql visitCall(CallExpression node, Map<VariableReferenceExpression, ColumnHandle> context)
{
    FunctionMetadata metadata = functionMetadataManager.getFunctionMetadata(node.getFunctionHandle());
    ImmutableList.Builder<FilterPushdownScubaSql> argumentSqls = ImmutableList.builder();

    for (RowExpression expression : node.getArguments()) {
        FilterPushdownScubaSql sql = expression.accept(this, context);
        argumentSqls.add(sql);
    }

    return functionTranslator.translate(metadata, argumentSqls.build());
}