framework/db/ColumnSchemaBuilder.php
protected function getTypeCategory()
    {
        return isset($this->categoryMap[$this->type]) ? $this->categoryMap[$this->type] : null;
    }
protected function getTypeCategory()
    {
        return isset($this->categoryMap[$this->type]) ? $this->categoryMap[$this->type] : null;
    }
Returns the category of the column type.
@return string a string containing the column type category name.
@since 2.0.8