Storm\Drivers\Base\Relational\Traits\ForeignKey::GetParentColumns PHP Method

    public final function GetParentColumns()
    {
        return $this->ParentColumnIdentifierMap;
    }

 protected function GroupRelatedRowsByParentKeys(array &$MappedRelatedRows, ForeignKey $ForeignKey, array $ParentRows, array $RelatedRows)
 {
     $ParentJoinTableKeys = $this->ParentForeignKey->GetParentColumns();
     $ParentReferencedKeys = $this->ParentForeignKey->GetReferencedColumns();
     $GroupedRelatedRows = $this->GroupRowsByColumnValues($RelatedRows, $ParentJoinTableKeys);
     $this->MapParentRowKeysToGroupedRelatedRows($MappedRelatedRows, $ParentRows, $ParentReferencedKeys, $GroupedRelatedRows);
 }