// ***************************************************************************
// Initialize the hash of tables in the descriptor.
// For every table in the JBBC list of the Hub as well as the extraHub,
// insert an entry into the hash table, using the table's name as the hash key.
// ***************************************************************************
void MVDetails::initTables(const QRJBBPtr jbb, CollHeap* heap)
{
// Map all the table names
// Start with the Hub tables.
const ElementPtrList& hubTables = jbb->getHub()->getJbbcList()->getList();
for (CollIndex i=0; i<hubTables.entries(); i++)
{
QRElementPtr element = hubTables[i];
// Ignore JBBCs that are not tables - they must be child-JBB references,
// so we will get to them when looping over the JBB list.
if (element->getElementType() == ET_Table)
{
const QRTablePtr table = element->downCastToQRTable();
const NAString& name = table->getTableName();
tableByNameHash_.insert(&name, table);
}
}
// Continue with the extra-hub tables.
const QRExtraHubPtr extraHub = jbb->getExtraHub();
if (extraHub != NULL)
{
QRTableListPtr extraHubTables = extraHub->getTableList();
if (extraHubTables != NULL)
{
for (CollIndex j=0; j<extraHubTables->entries(); j++)
{
QRTablePtr table = (*extraHubTables)[j];
const NAString& name = table->getTableName();
tableByNameHash_.insert(&name, table);
}
}
}
}
// ***************************************************************************
// ***************************************************************************
void MVDetails::addEqualitySet(QRJoinPredPtr joinPredElement,
NABoolean isFromExpr,
QROutputPtr output,
CollHeap* heap)
{
const ElementPtrList& equalitySet = joinPredElement->getEqualityList();
for (CollIndex i=0; i<equalitySet.entries(); i++)
{
const QRElementPtr halfPred = equalitySet[i];
// Now lets look at the equality set members
// Ignore members that are not simple columns.
if (halfPred->getElementType() != ET_Column)
continue;
const QRColumnPtr eqSetColumn = halfPred->getReferencedElement()->downCastToQRColumn();
// If this JoinPred element is a column of an LOJ table,
// skip it because it is not really equal to the others.
const QRElementPtr tableElem = getElementForID(eqSetColumn->getTableID());
if (tableElem->downCastToQRTable()->hasLOJParent())
continue;
// Compute the "ID Qualified" column name as the key.
const NAString* idQualifiedColName =
calcIDQualifiedColumnName(eqSetColumn->getTableID(), eqSetColumn->getColumnName(), heap);
// Insert into the hash table.
if (isFromExpr)
outputByInputColumns_.insert(idQualifiedColName, output);
else
outputByColumnName_.insert(idQualifiedColName, output);
}
} // MVDetails::addEqualitySet
// ***************************************************************************
// Get the table element (from the JBBC list) with this name (or NULL if not found).
// This method must NOT be used to find a specific table instance, because
// with self-joins, multiple tables have the same name.
// Use MVCandidate::getMvTableForQueryID() instead.
// ***************************************************************************
const QRTablePtr MVDetails::getTableFromName(const NAString& name)
{
QRElementPtr table = tableByNameHash_.getFirstValue(&name);
if (table == NULL)
return NULL;
return table->downCastToQRTable();
}
// ***************************************************************************
// Get the output list element, that its output item (column or expression)
// has the ID id (or NULL if not found).
// ***************************************************************************
const QROutputPtr MVDetails::getOutputForID(const NAString& id)
{
QRElementPtr output = outputByIDHash_.getFirstValue(&id);
if (output == NULL)
return NULL;
return output->downCastToQROutput();
}
// ***************************************************************************
// Is this column from a table that has an LOJ parent?
// ***************************************************************************
NABoolean DescriptorDetails::isColumnFromLojTable(const QRColumnPtr col)
{
const NAString& tableID = col->getTableID();
const QRElementPtr tableElem = getElementForID(tableID);
assertLogAndThrow(CAT_MATCHTST_MVDETAILS, LL_MVQR_FAIL,
tableElem, QRLogicException,
"Table not found in JBB.");
const QRTablePtr table = tableElem->downCastToQRTable();
return table->hasLOJParent();
}
// ***************************************************************************
// Get the output list element, that represents an expression, that has
// this column name as one of its input columns (or NULL if not found).
// ***************************************************************************
const QROutputPtr MVDetails::getOutputByInputColumns(const NAString& id,
const NAString& name,
CollHeap* heap)
{
const NAString* idName = calcIDQualifiedColumnName(id, name, heap);
QRElementPtr output = outputByInputColumns_.getFirstValue(idName);
delete idName;
if (output == NULL)
return NULL;
return output->downCastToQROutput();
}
// ***************************************************************************
// Get the output list element, that represents the output expression that
// matches text (or NULL if not found).
// ***************************************************************************
const QROutputPtr MVDetails::getOutputByExprText(const NAString& text)
{
QRElementPtr output = outputByExprText_.getFirstValue(&text);
QRLogger::log(CAT_MATCHTST_MVDETAILS, LL_DEBUG,
"Checking for output expression: %s, %s.",
text.data(),
(output == NULL) ? "Not found it" : "Found it");
if (output == NULL)
return NULL;
else
return output->downCastToQROutput();
}
Visitor::VisitResult RefFinderVisitor::visit(QRElementPtr caller)
{
// Elements that don't reference other elements, should reference
// themselves (the default value).
if (caller->getRef() == "")
return VR_Continue;
QRElementPtr elem = descDetails_->getElementForID(caller->getRef());
assertLogAndThrow(CAT_MATCHTST_MVDETAILS, LL_MVQR_FAIL,
elem != NULL, QRLogicException,
"Element is referencing a non-existing element.");
caller->setReferencedElement(elem);
return VR_Continue;
}
// ***************************************************************************
// ***************************************************************************
const NAString& DescriptorDetails::getTableNameFromColumn(QRColumnPtr colElem)
{
static const NAString empty("");
const NAString& tableID = colElem->getReferencedElement()->downCastToQRColumn()->getTableID();
const QRElementPtr tableElem = getElementForID(tableID);
if (tableElem==NULL)
{
// This table is in a JBB that was ommitted from the query descriptor.
// Return an empty table name.
return empty;
}
const QRTablePtr table = tableElem->downCastToQRTable();
return table->getTableName();
}
// ***************************************************************************
// ***************************************************************************
void JBBDetails::initBaseTables(CollHeap* heap)
{
// Create BaseTableDetails objects for the JBB hub tables.
const ElementPtrList& hubTables = jbbDesc_->getHub()->getJbbcList()->getList();
for (CollIndex i=0; i<hubTables.entries(); i++)
{
const QRElementPtr jbbc = hubTables[i];
if (jbbc->getElementType() != ET_Table)
continue; // Skip reference to other JBBs.
const QRTablePtr table = jbbc->downCastToQRTable();
if (table->hasLOJParent())
hasLOJs_ = TRUE;
// Rest of the stuff only needed for MVs.
if (!isAnMV_)
continue;
BaseTableDetailsPtr tableDetails = new(heap)
BaseTableDetails(table, TRUE, ADD_MEMCHECK_ARGS(heap));
baseTablesByID_.insert(&tableDetails->getID(), tableDetails);
}
// Now do the same for the extra-hub tables.
const QRTableListPtr extraHubTables = jbbDesc_->getExtraHub()->getTableList();
if (extraHubTables != NULL)
{
for (CollIndex j=0; j<extraHubTables->entries(); j++)
{
const QRTablePtr table = (*extraHubTables)[j];
if (table->hasLOJParent())
hasLOJs_ = TRUE;
// Rest of the stuff only needed for MVs.
if (!isAnMV_)
continue;
BaseTableDetailsPtr tableDetails = new(heap)
BaseTableDetails(table, FALSE, ADD_MEMCHECK_ARGS(heap));
baseTablesByID_.insert(&tableDetails->getID(), tableDetails);
}
}
}
// ***************************************************************************
// ***************************************************************************
void DescriptorDetails::initJoinPredList(const QRJoinPredListPtr jpList)
{
if (jpList == NULL)
return;
CollIndex maxEntries = jpList->entries();
//Iterate over JoinPred list
for (CollIndex i=0; i<maxEntries; i++)
{
const QRJoinPredPtr joinPred = (*jpList)[i];
const ElementPtrList& equalitySet = joinPred->getEqualityList();
// Iterate over equality set in JoinPred.
for (CollIndex i=0; i<equalitySet.entries(); i++)
{
const QRElementPtr halfPred = equalitySet[i]->getReferencedElement();
// Now lets look at the equality set members
// Ignore members that are not simple columns.
if (halfPred->getElementType() != ET_Column)
continue;
const QRColumnPtr eqSetColumn = halfPred->getReferencedElement()->downCastToQRColumn();
// Skip columns from other JBBs.
if (getElementForID(eqSetColumn->getTableID()) == NULL)
continue;
// Skip columns from LOJ tables.
if (isColumnFromLojTable(eqSetColumn))
continue;
const NAString& columnID = eqSetColumn->getID();
joinPredHash_.insert(&columnID, joinPred);
}
}
}
// ***************************************************************************
// Initialize the several hash tables that map output list elements:
// outputByIDHash_ - Using the ID of the output item as the key.
// outputByColumnName_ - Using the "ID Qualified" column name as the key.
// outputByExprText_ - Using the expression text as the key.
// outputByInputColumns_ - Using the name of expression input column as the key.
// ***************************************************************************
void MVDetails::initOutputs(const QRJBBPtr jbb, CollHeap* heap)
{
// Match the output elements with their names.
const QROutputListPtr outputList = jbb->getOutputList();
assertLogAndThrow(CAT_MATCHTST_MVDETAILS, LL_MVQR_FAIL,
outputList != NULL, QRLogicException,
"Output list is null.");
// For each output list element
for (CollIndex i=0; i<outputList->entries(); i++)
{
QROutputPtr output = (*outputList)[i];
// Set the ordinal number of the output element.
output->setColPos(i+1);
// Get the output item (column or expression).
QRElementPtr outputItem = output->getOutputItem()->getReferencedElement();
const NAString& id = outputItem->getID();
// Insert the ID of the output item (whatever it is) into the ID hash.
outputByIDHash_.insert(&id, output);
// OK, now lets check what type of output item it is.
switch (outputItem->getElementType())
{
case ET_Column:
{
// If its an output column, add it to the output column by name hash.
const QRColumnPtr col = outputItem->downCastToQRColumn();
const QRElementPtr tableElem = getElementForID(col->getTableID());
NABoolean hasLOJParent = tableElem->downCastToQRTable()->hasLOJParent();
if (!isFromJoin(col) || hasLOJParent)
{
// Compute the "ID Qualified" column name as the key.
const NAString* idQualifiedColName =
calcIDQualifiedColumnName(col->getTableID(), col->getColumnName(), heap);
// Insert into the hash table.
outputByColumnName_.insert(idQualifiedColName, output);
}
else
{
// If its an equality set, insert all the participating columns
// as pointing to the same MV output column.
const QRJoinPredPtr jp = getJoinPred(col);
const QRJoinPredPtr joinPredElement = jp->downCastToQRJoinPred();
addEqualitySet(joinPredElement, FALSE, output, heap);
}
break;
}
case ET_JoinPred:
{
assertLogAndThrow(CAT_MATCHTST_MVDETAILS, LL_MVQR_FAIL,
(outputItem->getElementType() == ET_JoinPred), QRLogicException,
"Unexpected JoinPred element.");
// If its an equality set, insert all the participating columns
// as pointing to the same MV output column.
const QRJoinPredPtr joinPredElement = outputItem->downCastToQRJoinPred();
addEqualitySet(joinPredElement, FALSE, output, heap);
break;
}
case ET_Expr:
{
// This is an expression. Insert the expression text into the expression hash.
const QRExprPtr expr = outputItem->downCastToQRExpr();
const NAString& exprText = expr->getExprText();
outputByExprText_.insert(&exprText, output);
QRLogger::log(CAT_MATCHTST_MVDETAILS, LL_DEBUG,
"Adding output expression: %s.", exprText.data());
// Also map the expressions's input columns to it.
// This call to getInitColumns() also inits the input list using the
// right heap.
const ElementPtrList& inputs = expr->getInputColumns(heap);
if (inputs.entries() > 0)
{
for (CollIndex j=0; j<inputs.entries(); j++)
{
QRElementPtr inputElem = inputs[j]->getReferencedElement();
if (inputElem->getElementType() == ET_Column)
{
QRColumnPtr inputCol = inputElem->downCastToQRColumn();
// Compute the "ID Qualified" column name as the key.
const NAString* idQualifiedColName =
calcIDQualifiedColumnName(inputCol->getTableID(), inputCol->getColumnName(), heap);
outputByInputColumns_.insert(idQualifiedColName, output);
}
else
{
QRJoinPredPtr inputJoinPred = inputElem->downCastToQRJoinPred();
addEqualitySet(inputJoinPred, TRUE, output, heap);
}
}
}
// Check if this is the COUNT(*) function.
QRExplicitExprPtr rootExpr = expr->getExprRoot();
if (rootExpr->getElementType() == ET_Function)
{
QRFunctionPtr func = rootExpr->downCastToQRFunction();
if (func->getAggregateFunc() == QRFunction::AFT_COUNTSTAR)
{
// Found it, now remember it for later use.
// If a COUNT(*) equivalent function has already been found
// (see below) - overwrite it.
countStar_ = output;
}
else if (countStar_ == NULL &&
func->isCountStarEquivalent(heap) )
{
// Well, we didn't find a COUNT(*) yet, but we found a COUNT(a)
// and the input column is NOT NOLL, we can use it as a COUNT(*) column.
countStar_ = output;
}
}
} // end of case ET_Expr
break;
} // switch on element type
} // for on output list elements
} // MVDetails::initOutputs()
// ***************************************************************************
// ***************************************************************************
void JBBDetails::initRangePreds(CollHeap* heap)
{
// Initialize the Range predicates.
const QRRangePredListPtr rangePreds = jbbDesc_->getHub()->getRangePredList();
if (rangePreds==NULL || rangePreds->entries() == 0)
{
hasNoRangePredicates_ = TRUE;
return;
}
for (CollIndex k=0; k<rangePreds->entries(); k++)
{
const QRRangePredPtr rangePred = (*rangePreds)[k];
const QRElementPtr rangeElem = rangePred->getRangeItem()->getReferencedElement();
if (rangeElem->getElementType() == ET_Column && rangePred->isSingleValue())
{
constColumns_.insert(&rangeElem->getID());
}
// For query descriptors, only check for const columns.
if (!isAnMV_)
continue;
if (rangeElem->getElementType() == ET_Column)
{
const QRColumnPtr rangeColumn = rangeElem->downCastToQRColumn();
if (!descDetails_->isFromJoin(rangeColumn))
{
// This column is NOT part of a join predicate.
BaseTableDetailsPtr rangeTable = getBaseTableByID(rangeColumn->getTableID());
rangeTable->addRangePredicateOnColumn(rangePred, rangeColumn);
}
else
{
// This column IS part of a join predicate.
// Insert the range pred for all the participating columns.
const QRJoinPredPtr jp = descDetails_->getJoinPred(rangeColumn);
const ElementPtrList& equalitySet = jp->getEqualityList();
for (CollIndex i=0; i<equalitySet.entries(); i++)
{
const QRElementPtr halfPred = equalitySet[i];
// Now lets look at the equality set members
// Ignore members that are not simple columns.
if (halfPred->getElementType() != ET_Column)
continue;
const QRColumnPtr eqSetColumn = halfPred->getReferencedElement()->downCastToQRColumn();
BaseTableDetailsPtr rangeTable = getBaseTableByID(eqSetColumn->getTableID());
rangeTable->addRangePredicateOnColumn(rangePred, eqSetColumn);
}
}
}
else if (rangeElem->getElementType() == ET_JoinPred)
{
assertLogAndThrow(CAT_MATCHTST_MVDETAILS, LL_MVQR_FAIL,
(rangeElem->getElementType() == ET_JoinPred), QRLogicException,
"Unexpected JoinPred element.");
// If its an equality set, insert the range pred for all the participating columns.
const QRJoinPredPtr joinPredElement = rangeElem->downCastToQRJoinPred();
const ElementPtrList& equalitySet = joinPredElement->getEqualityList();
for (CollIndex i=0; i<equalitySet.entries(); i++)
{
const QRElementPtr halfPred = equalitySet[i];
// Now lets look at the equality set members
// Ignore members that are not simple columns.
if (halfPred->getElementType() != ET_Column)
continue;
const QRColumnPtr eqSetColumn = halfPred->getReferencedElement()->downCastToQRColumn();
BaseTableDetailsPtr rangeTable = getBaseTableByID(eqSetColumn->getTableID());
rangeTable->addRangePredicateOnColumn(rangePred, eqSetColumn);
}
}
else
{
// The range pred is on an expression. Insert it for all the expression's input columns.
const QRExprPtr rangeExpr = rangeElem->downCastToQRExpr();
if (rangeExpr->getExprRoot()->containsAnAggregate(heap))
{
hasHavingPredicates_ = TRUE;
}
// Verify we have a single input column
// No input columns mean its a COUNT(*), which is OK too.
const ElementPtrList& inputs = rangeExpr->getInputColumns(heap);
assertLogAndThrow(CAT_MATCHTST_MVDETAILS, LL_MVQR_FAIL,
(inputs.entries() <= 1), QRLogicException,
"Range predicate expression must have a single input at most.");
const NAString& predText = rangeExpr->getExprText();
// Look it up in the hash table: do we already have a range pred with this text?
RangePredPtrList* predList = getRangePredsOnExpression(predText);
if (predList == NULL)
{
// No, its the first one. Create a new list.
predList = new(heap) RangePredPtrList(heap);
// And insert it into the hash table.
rangePredicates_.insert(&predText, predList);
}
// Insert the predicate into the pred list.
predList->insert(rangePred);
}
}
} // JBBDetails::init()
LatticeIndexablePtr QRGroupLattice::elementToKey(const QRElementPtr element,
QRJoinSubGraphMapPtr map,
DescriptorDetailsPtr queryDetails,
NABoolean insertMode,
NABoolean isRecursive)
{
QRElementPtr elem = element->getReferencedElement();
QRColumnPtr col = NULL;
if (elem->getElementType() == ET_Column)
{
col = elem->downCastToQRColumn();
if (queryDetails->isFromJoin(col) && !isRecursive)
{
// This groupby element is a join pred.
// During insert, this loop inserts the first column.
// During search, try each equality set element until we find one that
// appears in our array.
const QRJoinPredPtr eqSet = queryDetails->getJoinPred(col);
const ElementPtrList& equalityList = eqSet->getEqualityList();
if (insertMode)
{
// Insert mode - pick the first column of the equality set.
col = equalityList[0]->downCastToQRColumn();
}
else
{
// Search mode - pick the first equality set entry that is found in this LatticeIndex.
for (CollIndex i=0; i<equalityList.entries(); i++)
{
QRElementPtr entry = equalityList[i]->getReferencedElement();
// Call recursively for each join pred column.
LatticeIndexablePtr entryKey = elementToKey(entry, map, queryDetails, insertMode, TRUE);
if (entryKey == NULL)
continue;
if (lattice_->contains(entryKey))
{
// Found it in the lattice index.
col = entry->downCastToQRColumn();
break;
}
} // for ( )
// If none of the entries was found - give up now.
if (col == NULL)
return NULL;
} // if insert mode
} // if JoinPred
} // if Column
NAString* key = NULL;
if (col != NULL)
{
col = col->getReferencedElement()->downCastToQRColumn();
const NAString& tableID = col->getTableID();
Int32 Inx = map->getIndexForTable(tableID);
if (Inx == -1)
{
assertLogAndThrow(CAT_GRP_LATTCE_INDX, LL_ERROR,
!insertMode, QRLogicException,
"Table index not found in Insert mode (Inserting a multi-JBB MV?).");
return NULL;
}
char buffer[4096+5];
sprintf(buffer, "%d.%s", Inx, col->getColumnName().data() );
key = new(heap_) NAString(buffer, heap_);
}
else
{
// This is an expression.
// TBD We still do not handle expressions using columns from self-join tables.
key = new(heap_) NAString(element->getSortName(), heap_);
}
// The reverseKeyHash should always use the most recent MV inserted.
if (insertMode)
{
reverseKeyHash_.remove(key);
reverseKeyHash_.insert(key, element);
}
return key;
}
