private HQLContextInterface createHQLContext(
Set<CandidateFact> facts,
Map<Dimension, CandidateDim> dimsToQuery,
Map<CandidateFact, Set<Dimension>> factDimMap)
throws LensException {
if (facts == null || facts.size() == 0) {
return new DimOnlyHQLContext(dimsToQuery, this, this);
} else if (facts.size() == 1 && facts.iterator().next().getStorageTables().size() > 1) {
// create single fact with multiple storage context
return new SingleFactMultiStorageHQLContext(facts.iterator().next(), dimsToQuery, this, this);
} else if (facts.size() == 1 && facts.iterator().next().getStorageTables().size() == 1) {
// create single fact context
return new SingleFactSingleStorageHQLContext(
facts.iterator().next(), dimsToQuery, this, this);
} else {
return new MultiFactHQLContext(facts, dimsToQuery, factDimMap, this);
}
}
public void pruneCandidateFactWithCandidateSet(CandidateTablePruneCause pruneCause) {
// remove candidate facts that are not part of any covering set
Set<CandidateFact> allCoveringFacts = new HashSet<CandidateFact>();
for (Set<CandidateFact> set : candidateFactSets) {
allCoveringFacts.addAll(set);
}
for (Iterator<CandidateFact> i = candidateFacts.iterator(); i.hasNext(); ) {
CandidateFact cfact = i.next();
if (!allCoveringFacts.contains(cfact)) {
log.info("Not considering fact table:{} as {}", cfact, pruneCause);
addFactPruningMsgs(cfact.fact, pruneCause);
i.remove();
}
}
}
String getQBFromString(CandidateFact fact, Map<Dimension, CandidateDim> dimsToQuery)
throws LensException {
String fromString;
if (getJoinAST() == null) {
if (cube != null) {
if (dimensions.size() > 0) {
throw new LensException(LensCubeErrorCode.NO_JOIN_CONDITION_AVAILABLE.getLensErrorInfo());
}
fromString = fact.getStorageString(getAliasForTableName(cube.getName()));
} else {
if (dimensions.size() != 1) {
throw new LensException(LensCubeErrorCode.NO_JOIN_CONDITION_AVAILABLE.getLensErrorInfo());
}
Dimension dim = dimensions.iterator().next();
fromString = dimsToQuery.get(dim).getStorageString(getAliasForTableName(dim.getName()));
}
} else {
StringBuilder builder = new StringBuilder();
getQLString(qb.getQbJoinTree(), builder, fact, dimsToQuery);
fromString = builder.toString();
}
return fromString;
}
