/**
* @param independentExpressions
* @param dependentExpressions
* @param makeDep
* @return
* @throws TeiidComponentException
* @throws QueryMetadataException
* @since 4.3
*/
private PlanNode getDependentCriteriaNode(
String id,
List<Expression> independentExpressions,
List<Expression> dependentExpressions,
PlanNode indNode,
QueryMetadataInterface metadata,
DependentCostAnalysis dca,
Boolean bound,
MakeDep makeDep)
throws QueryMetadataException, TeiidComponentException {
Float cardinality = null;
List<DependentSetCriteria.AttributeComparison> expressions =
new ArrayList<DependentSetCriteria.AttributeComparison>(dependentExpressions.size());
for (int i = 0; i < dependentExpressions.size(); i++) {
Expression depExpr = dependentExpressions.get(i);
Expression indExpr = independentExpressions.get(i);
DependentSetCriteria.AttributeComparison comp =
new DependentSetCriteria.AttributeComparison();
if (dca != null && dca.expectedNdv[i] != null) {
if (dca.expectedNdv[i] > 4 * dca.maxNdv[i]) {
continue; // not necessary to use
}
comp.ndv = dca.expectedNdv[i];
comp.maxNdv = dca.maxNdv[i];
} else {
Collection<ElementSymbol> elems = ElementCollectorVisitor.getElements(indExpr, true);
if (cardinality == null) {
cardinality = NewCalculateCostUtil.computeCostForTree(indNode, metadata);
}
comp.ndv = NewCalculateCostUtil.getNDVEstimate(indNode, metadata, cardinality, elems, true);
if (bound) {
if (dca != null) {
comp.maxNdv = Math.max(comp.ndv * 4, dca.expectedCardinality * 2);
} else {
comp.maxNdv = Math.max(UNKNOWN_INDEPENDENT_CARDINALITY, comp.ndv * 4);
}
}
}
comp.ind = indExpr;
comp.dep = SymbolMap.getExpression(depExpr);
expressions.add(comp);
}
PlanNode result = createDependentSetNode(id, expressions);
if (makeDep != null) {
DependentSetCriteria dsc = (DependentSetCriteria) result.getProperty(Info.SELECT_CRITERIA);
dsc.setMakeDepOptions(makeDep);
}
return result;
}
