@Override
public SubPlanBuilder visitOutput(OutputNode node, Void context) {
SubPlanBuilder current = node.getSource().accept(this, context);
if (current.isDistributed()) {
current.setRoot(
new SinkNode(
idAllocator.getNextId(), current.getRoot(), current.getRoot().getOutputSymbols()));
// create a new non-partitioned fragment
current =
createSingleNodePlan(
new ExchangeNode(
idAllocator.getNextId(),
current.getId(),
current.getRoot().getOutputSymbols()))
.addChild(current.build());
}
current.setRoot(
new OutputNode(
node.getId(), current.getRoot(), node.getColumnNames(), node.getOutputSymbols()));
return current;
}
@Override
public PlanNode visitOutput(OutputNode node, RewriteContext<FragmentProperties> context) {
context
.get()
.setSingleNodeDistribution() // TODO: add support for distributed output
.setOutputLayout(node.getOutputSymbols())
.setUnpartitionedOutput();
return context.defaultRewrite(node, context.get());
}
private static String getColumns(OutputNode node) {
Iterator<String> columnNames = node.getColumnNames().iterator();
String columns = "";
int nameWidth = 0;
while (columnNames.hasNext()) {
String columnName = columnNames.next();
columns += columnName;
nameWidth += columnName.length();
if (columnNames.hasNext()) {
columns += ", ";
}
if (nameWidth >= MAX_NAME_WIDTH) {
columns += "\\n";
nameWidth = 0;
}
}
return columns;
}
@Override
public Void visitOutput(OutputNode node, Void context) {
String columns = getColumns(node);
printNode(node, format("Output[%s]", columns), NODE_COLORS.get(NodeType.OUTPUT));
return node.getSource().accept(this, context);
}
@Override
public PlanNode visitOutput(OutputNode node, RewriteContext<Set<Symbol>> context) {
Set<Symbol> expectedInputs = ImmutableSet.copyOf(node.getOutputSymbols());
PlanNode source = context.rewrite(node.getSource(), expectedInputs);
return new OutputNode(node.getId(), source, node.getColumnNames(), node.getOutputSymbols());
}