xingtanzjr commented on a change in pull request #5291:
URL: https://github.com/apache/iotdb/pull/5291#discussion_r830636789
##########
File path:
server/src/main/java/org/apache/iotdb/db/mpp/sql/planner/plan/DistributionPlanner.java
##########
@@ -29,7 +39,214 @@ public DistributionPlanner(Analysis analysis,
LogicalQueryPlan logicalPlan) {
this.logicalPlan = logicalPlan;
}
+ public PlanNode rewriteSource() {
+ SourceRewriter rewriter = new SourceRewriter();
+ return rewriter.visit(logicalPlan.getRootNode(), new
DistributionPlanContext());
+ }
+
+ public PlanNode addExchangeNode(PlanNode root) {
+ ExchangeNodeAdder adder = new ExchangeNodeAdder();
+ return adder.visit(root, new NodeGroupContext());
+ }
+
public DistributedQueryPlan planFragments() {
return null;
}
+
+ private class SourceRewriter extends
SimplePlanNodeRewriter<DistributionPlanContext> {
+
+ //TODO: (xingtanzjr) implement the method visitDeviceMergeNode()
+ public PlanNode visitDeviceMerge(TimeJoinNode node,
DistributionPlanContext context) {
+ return null;
+ }
+
+ public PlanNode visitTimeJoin(TimeJoinNode node, DistributionPlanContext
context) {
+ TimeJoinNode root = (TimeJoinNode) node.clone();
+
+ // Step 1: Get all source nodes. For the node which is not source, add
it as the child of
+ // current TimeJoinNode
+ List<SeriesScanNode> sources = new ArrayList<>();
+ for (PlanNode child : node.getChildren()) {
+ if (child instanceof SeriesScanNode) {
+ // If the child is SeriesScanNode, we need to check whether this
node should be seperated
+ // into several splits.
+ SeriesScanNode handle = (SeriesScanNode) child;
+ Set<DataRegion> dataDistribution =
+ analysis.getPartitionInfo(handle.getSeriesPath(),
handle.getTimeFilter());
+ // If the size of dataDistribution is m, this SeriesScanNode should
be seperated into m
+ // SeriesScanNode.
+ for (DataRegion dataRegion : dataDistribution) {
+ SeriesScanNode split = (SeriesScanNode) handle.clone();
+ split.setDataRegion(dataRegion);
+ sources.add(split);
+ }
+ } else if (child instanceof SeriesAggregateScanNode) {
+ // TODO: (xingtanzjr) We should do the same thing for
SeriesAggregateScanNode. Consider to
+ // make SeriesAggregateScanNode
+ // and SeriesScanNode to derived from the same parent Class because
they have similar
+ // process logic in many scenarios
+ } else {
+ // In a general logical query plan, the children of TimeJoinNode
should only be
+ // SeriesScanNode or SeriesAggregateScanNode
+ // So this branch should not be touched.
+ root.addChild(visit(child, context));
+ }
+ }
+
+ // Step 2: For the source nodes, group them by the DataRegion.
+ Map<DataRegion, List<SeriesScanNode>> sourceGroup = new HashMap<>();
+ sources.forEach(
+ source -> {
+ List<SeriesScanNode> group =
+ sourceGroup.containsKey(source.getDataRegion())
+ ? sourceGroup.get(source.getDataRegion())
+ : new ArrayList<>();
+ group.add(source);
+ sourceGroup.put(source.getDataRegion(), group);
+ });
Review comment:
Great!
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