public function prepareDatasetSourceStatement(DataControllerCallContext $callcontext, DatasetMetaData $dataset, array $columnNames = NULL)
{
$statement = NULL;
// preparing list of datasets which we need to work with
$referencePaths = ReferenceLinkBuilder::selectReferencedColumnNames($columnNames);
if (isset($referencePaths)) {
$linkBuilder = new ReferenceLinkBuilder();
$link = $linkBuilder->prepareReferenceBranches($dataset->name, $referencePaths);
$statement = $this->assembleConnectedDatasetSourceStatement($callcontext, $link, $columnNames);
} else {
$statement = $this->assembleDatasetSourceStatement($callcontext, $dataset, $columnNames);
}
return $statement;
}
