private void getQLString(
QBJoinTree joinTree,
StringBuilder builder,
CandidateFact fact,
Map<Dimension, CandidateDim> dimsToQuery)
throws LensException {
List<String> joiningTables = new ArrayList<>();
if (joinTree.getBaseSrc()[0] == null) {
if (joinTree.getJoinSrc() != null) {
getQLString(joinTree.getJoinSrc(), builder, fact, dimsToQuery);
}
} else { // (joinTree.getBaseSrc()[0] != null){
String alias = joinTree.getBaseSrc()[0].toLowerCase();
builder.append(getStorageStringWithAlias(fact, dimsToQuery, alias));
joiningTables.add(alias);
}
if (joinTree.getJoinCond() != null) {
builder.append(JoinUtils.getJoinTypeStr(joinTree.getJoinCond()[0].getJoinType()));
builder.append(" JOIN ");
}
if (joinTree.getBaseSrc()[1] == null) {
if (joinTree.getJoinSrc() != null) {
getQLString(joinTree.getJoinSrc(), builder, fact, dimsToQuery);
}
} else { // (joinTree.getBaseSrc()[1] != null){
String alias = joinTree.getBaseSrc()[1].toLowerCase();
builder.append(getStorageStringWithAlias(fact, dimsToQuery, alias));
joiningTables.add(alias);
}
String joinCond = joinConds.get(joinTree);
if (joinCond != null) {
builder.append(" ON ");
builder.append(joinCond);
// joining tables will contain all tables involved in joins.
// we need to push storage filters for Dimensions into join conditions, thus the following
// code
// takes care of the same.
for (String joiningTable : joiningTables) {
if (cubeTbls.get(joiningTable) instanceof Dimension) {
DimOnlyHQLContext.appendWhereClause(
builder, getWhereClauseWithAlias(dimsToQuery, joiningTable), true);
dimsToQuery.get(cubeTbls.get(joiningTable)).setWhereClauseAdded(joiningTable);
}
}
} else {
throw new LensException(LensCubeErrorCode.NO_JOIN_CONDITION_AVAILABLE.getLensErrorInfo());
}
}
void printJoinTree(QBJoinTree joinTree, StringBuilder builder) {
builder.append("leftAlias:" + joinTree.getLeftAlias());
if (joinTree.getLeftAliases() != null) {
builder.append("\n leftAliases:");
for (String alias : joinTree.getLeftAliases()) {
builder.append("\n\t " + alias);
}
}
if (joinTree.getRightAliases() != null) {
builder.append("\n rightAliases:");
for (String alias : joinTree.getRightAliases()) {
builder.append("\n\t " + alias);
}
}
if (joinTree.getJoinSrc() != null) {
builder.append("\n JoinSrc: {");
printJoinTree(joinTree.getJoinSrc(), builder);
builder.append("\n }");
}
if (joinTree.getBaseSrc() != null) {
builder.append("\n baseSrcs:");
for (String src : joinTree.getBaseSrc()) {
builder.append("\n\t " + src);
}
}
builder.append("\n noOuterJoin: " + joinTree.getNoOuterJoin());
builder.append("\n noSemiJoin: " + joinTree.getNoSemiJoin());
builder.append("\n mapSideJoin: " + joinTree.isMapSideJoin());
if (joinTree.getJoinCond() != null) {
builder.append("\n joinConds:");
for (JoinCond cond : joinTree.getJoinCond()) {
builder.append(
"\n\t left: "
+ cond.getLeft()
+ " right: "
+ cond.getRight()
+ " type:"
+ cond.getJoinType()
+ " preserved:"
+ cond.getPreserved());
}
}
}