@Override
public PlanNode visitAggregation(AggregationNode node, RewriteContext<Set<Symbol>> context) {
ImmutableSet.Builder<Symbol> expectedInputs =
ImmutableSet.<Symbol>builder().addAll(node.getGroupBy());
if (node.getHashSymbol().isPresent()) {
expectedInputs.add(node.getHashSymbol().get());
}
ImmutableMap.Builder<Symbol, Signature> functions = ImmutableMap.builder();
ImmutableMap.Builder<Symbol, FunctionCall> functionCalls = ImmutableMap.builder();
ImmutableMap.Builder<Symbol, Symbol> masks = ImmutableMap.builder();
for (Map.Entry<Symbol, FunctionCall> entry : node.getAggregations().entrySet()) {
Symbol symbol = entry.getKey();
if (context.get().contains(symbol)) {
FunctionCall call = entry.getValue();
expectedInputs.addAll(DependencyExtractor.extractUnique(call));
if (node.getMasks().containsKey(symbol)) {
expectedInputs.add(node.getMasks().get(symbol));
masks.put(symbol, node.getMasks().get(symbol));
}
functionCalls.put(symbol, call);
functions.put(symbol, node.getFunctions().get(symbol));
}
}
if (node.getSampleWeight().isPresent()) {
expectedInputs.add(node.getSampleWeight().get());
}
PlanNode source = context.rewrite(node.getSource(), expectedInputs.build());
return new AggregationNode(
node.getId(),
source,
node.getGroupBy(),
functionCalls.build(),
functions.build(),
masks.build(),
node.getStep(),
node.getSampleWeight(),
node.getConfidence(),
node.getHashSymbol());
}
