@Override
public PlanNode visitUnnest(UnnestNode node, RewriteContext<Set<Symbol>> context) {
List<Symbol> replicateSymbols =
node.getReplicateSymbols()
.stream()
.filter(context.get()::contains)
.collect(toImmutableList());
Optional<Symbol> ordinalitySymbol = node.getOrdinalitySymbol();
if (ordinalitySymbol.isPresent() && !context.get().contains(ordinalitySymbol.get())) {
ordinalitySymbol = Optional.empty();
}
Map<Symbol, List<Symbol>> unnestSymbols = node.getUnnestSymbols();
ImmutableSet.Builder<Symbol> expectedInputs =
ImmutableSet.<Symbol>builder().addAll(replicateSymbols).addAll(unnestSymbols.keySet());
PlanNode source = context.rewrite(node.getSource(), expectedInputs.build());
return new UnnestNode(
node.getId(), source, replicateSymbols, unnestSymbols, ordinalitySymbol);
}
