private Map<Dimension, CandidateDim> pickCandidateDimsToQuery(Set<Dimension> dimensions)
throws LensException {
Map<Dimension, CandidateDim> dimsToQuery = new HashMap<Dimension, CandidateDim>();
if (!dimensions.isEmpty()) {
for (Dimension dim : dimensions) {
if (candidateDims.get(dim) != null && candidateDims.get(dim).size() > 0) {
CandidateDim cdim = candidateDims.get(dim).iterator().next();
log.info(
"Available candidate dims are:{}, picking up {} for querying.",
candidateDims.get(dim),
cdim.dimtable);
dimsToQuery.put(dim, cdim);
} else {
String reason = "";
if (dimPruningMsgs.get(dim) != null && !dimPruningMsgs.get(dim).isEmpty()) {
ByteArrayOutputStream out = null;
try {
ObjectMapper mapper = new ObjectMapper();
out = new ByteArrayOutputStream();
mapper.writeValue(out, dimPruningMsgs.get(dim).getJsonObject());
reason = out.toString("UTF-8");
} catch (Exception e) {
throw new LensException("Error writing dim pruning messages", e);
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
throw new LensException(e);
}
}
}
}
log.error(
"Query rewrite failed due to NO_CANDIDATE_DIM_AVAILABLE, Cause {}",
dimPruningMsgs.get(dim).toJsonObject());
throw new NoCandidateDimAvailableException(dimPruningMsgs.get(dim));
}
}
}
return dimsToQuery;
}
public boolean hasDimensionInQuery() {
return dimensions != null && !dimensions.isEmpty();
}
public boolean hasAggregates() {
return !aggregateExprs.isEmpty() || getExprCtx().hasAggregates();
}