public MultiSourceSelect(
Map<QualifiedName, AnalyzedRelation> sources,
List<OutputName> outputNames,
QuerySpec querySpec) {
assert sources.size() > 1 : "MultiSourceSelect requires at least 2 relations";
this.querySpec = querySpec;
this.sources = new LinkedHashMap<>(sources.size());
this.splitter = initSources(sources);
assert outputNames.size() == querySpec.outputs().size()
: "size of outputNames and outputSymbols must match";
fields = new ArrayList<>(outputNames.size());
for (int i = 0; i < outputNames.size(); i++) {
fields.add(new Field(this, outputNames.get(i), querySpec.outputs().get(i).valueType()));
}
}
public void normalize(EvaluatingNormalizer normalizer) {
querySpec.normalize(normalizer);
}