siddharthteotia commented on code in PR #8558:
URL: https://github.com/apache/pinot/pull/8558#discussion_r855395674
##########
pinot-query-planner/src/main/java/org/apache/pinot/query/planner/StagePlanner.java:
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@@ -95,12 +97,15 @@ private StageNode walkRelPlan(RelNode node, int
currentStageId) {
if (isExchangeNode(node)) {
// 1. exchangeNode always have only one input, get its input converted
as a new stage root.
StageNode nextStageRoot = walkRelPlan(node.getInput(0), getNewStageId());
- RelDistribution.Type exchangeType = ((LogicalExchange)
node).distribution.getType();
+ RelDistribution distribution = ((LogicalExchange)
node).getDistribution();
+ RelDistribution.Type exchangeType = distribution.getType();
// 2. make an exchange sender and receiver node pair
- StageNode mailboxReceiver = new MailboxReceiveNode(currentStageId,
nextStageRoot.getStageId(), exchangeType);
- StageNode mailboxSender = new
MailboxSendNode(nextStageRoot.getStageId(), mailboxReceiver.getStageId(),
+ StageNode mailboxReceiver = new MailboxReceiveNode(currentStageId,
node.getRowType(), nextStageRoot.getStageId(),
exchangeType);
+ StageNode mailboxSender = new
MailboxSendNode(nextStageRoot.getStageId(), node.getRowType(),
+ mailboxReceiver.getStageId(), exchangeType, exchangeType ==
RelDistribution.Type.HASH_DISTRIBUTED
+ ? new FieldSelectionKeySelector(distribution.getKeys().get(0)) :
null);
Review Comment:
yes totally agree on making this decision dictated by statistics / optimizer
etc. My point was more on if we are hardcoding the exchange type in the initial
implementation, it can be broadcast as I feel it is simpler to debug / get
right initially may be
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