src/Builder/Syntax/ColumnWriter.php
public function writeValueAsColumns(Select $select)
    {
        $valueAsColumns = $select->getColumnValues();
        $newColumns = [];

        if (!empty($valueAsColumns)) {
            foreach ($valueAsColumns as $alias => $value) {
                $value = $this->writer->writePlaceholderValue($value);
                $newValueColumn = array($alias => $value);

                $newColumns[] = SyntaxFactory::createColumn($newValueColumn, null);
            }
        }

        return $newColumns;
    }
public function writeValueAsColumns(Select $select)
    {
        $valueAsColumns = $select->getColumnValues();
        $newColumns = [];

        if (!empty($valueAsColumns)) {
            foreach ($valueAsColumns as $alias => $value) {
                $value = $this->writer->writePlaceholderValue($value);
                $newValueColumn = array($alias => $value);

                $newColumns[] = SyntaxFactory::createColumn($newValueColumn, null);
            }
        }

        return $newColumns;
    }
@param Select $select

@return array