//*****************************************************************************
//*****************************************************************************
NABoolean MVCandidate::CheckAnExtraHubTable(const NAString* tableID,
QRJoinSubGraphMapPtr mvSubGraphMap,
QRJoinSubGraphMapPtr querySubGraphMap,
NABoolean& extraHubTableWasAdded)
{
QRJoinSubGraphPtr mvSubGraph = mvSubGraphMap->getSubGraph();
QRJoinSubGraphPtr querySubGraph = querySubGraphMap->getSubGraph();
const QRTablePtr queryTableElement =
getQueryDetails()->getElementForID(*tableID)->downCastToQRTable();
const JoinGraphTablePtr queryGraphTable =
querySubGraph->getParentGraph()->getTableByID(queryTableElement->getID());
// If this extra-hub table is not directly connected to the rest of
// the subgraph, skip it for now.
if (queryGraphTable->isConnectedTo(querySubGraph) == FALSE)
{
// Add additional needed extra-hub tables here...
return TRUE;
}
// Find the corresponding MV table
const QRTablePtr mvTableElement = getMvDetails()->getTableFromName(queryTableElement->getTableName());
const JoinGraphTablePtr mvGraphTable =
mvSubGraph->getParentGraph()->getTableByID(mvTableElement->getID());
if (matchPredsFromTableToSubGraph(mvSubGraph,
querySubGraph,
mvGraphTable,
queryGraphTable) == FALSE)
{
// Match failed.
// Release the sandbox subgraphs and disqualify the MVCandidate.
deletePtr(mvSubGraphMap);
deletePtr(querySubGraphMap);
logMVWasDisqualified1("Extra hub table %s is needed but cannot be matched.",
queryTableElement->getTableName().data());
return FALSE;
}
// Add the table to both MV and query subgraphs.
querySubGraph->addTable(queryGraphTable);
mvSubGraph->addTable(mvGraphTable);
// To make sure that Pass 2 matching and result desxcriptor generation will
// work correctly, add the tables to the SubGraphMaps (they will have the same index).
CollIndex index = querySubGraph->entries();
querySubGraphMap->addTable(index, queryGraphTable);
mvSubGraphMap->addTable(index, mvGraphTable);
// We are done with this table, remove it from the list.
extraHubTables_.remove(tableID);
extraHubTableWasAdded = TRUE;
QRLogger::log(CAT_MVCAND, LL_DEBUG,
"ExtraHub table %s was matched for MV %s.",
queryTableElement->getTableName().data(),
mvDetails_->getMVName().data());
return TRUE;
} // MVCandidate::CheckAnExtraHubTable()
