@Override
public PlanNode visitProject(ProjectNode node, RewriteContext<Void> context) {
PlanNode source = context.rewrite(node.getSource());
Map<Symbol, Expression> assignments =
ImmutableMap.copyOf(
Maps.transformValues(node.getAssignments(), this::simplifyExpression));
return new ProjectNode(node.getId(), source, assignments);
}
@Override
public PlanNode visitProject(ProjectNode node, RewriteContext<Set<Symbol>> context) {
ImmutableSet.Builder<Symbol> expectedInputs = ImmutableSet.builder();
ImmutableMap.Builder<Symbol, Expression> builder = ImmutableMap.builder();
for (int i = 0; i < node.getOutputSymbols().size(); i++) {
Symbol output = node.getOutputSymbols().get(i);
Expression expression = node.getAssignments().get(output);
if (context.get().contains(output)) {
expectedInputs.addAll(DependencyExtractor.extractUnique(expression));
builder.put(output, expression);
}
}
PlanNode source = context.rewrite(node.getSource(), expectedInputs.build());
return new ProjectNode(node.getId(), source, builder.build());
}
@Override
public SubPlanBuilder visitProject(ProjectNode node, Void context) {
SubPlanBuilder current = node.getSource().accept(this, context);
current.setRoot(new ProjectNode(node.getId(), current.getRoot(), node.getOutputMap()));
return current;
}