JackieTien97 commented on code in PR #12446:
URL: https://github.com/apache/iotdb/pull/12446#discussion_r1595167588
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iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/distribution/SourceRewriter.java:
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@@ -719,6 +751,43 @@ private List<PlanNode> processRawSeriesScan(
return Collections.singletonList(parent);
}
+ private List<PlanNode> splitRegionScanNodeByRegion(
+ RegionScanNode node, DistributionPlanContext context) {
+ List<PlanNode> planNodesForRegions = new ArrayList<>();
+ Map<TRegionReplicaSet, Set<PartialPath>> devicesInRegion = new HashMap<>();
+ List<PartialPath> devicesList = node.getDevicePaths();
+ boolean isAllDeviceOnlyInOneRegion = true;
+
+ for (PartialPath device : devicesList) {
+ List<TRegionReplicaSet> dataDistribution =
+ analysis.getPartitionInfoByDevice(device,
context.getPartitionTimeFilter());
+ isAllDeviceOnlyInOneRegion = isAllDeviceOnlyInOneRegion &&
dataDistribution.size() == 1;
+ for (TRegionReplicaSet dataRegion : dataDistribution) {
+ devicesInRegion.computeIfAbsent(dataRegion, k -> new
HashSet<>()).add(device);
+ }
+ }
+
+ context.setAllDeviceOnlyInOneRegion(isAllDeviceOnlyInOneRegion);
+
+ // If there is only one region, return directly
+ if (devicesInRegion.size() == 1) {
+ node.setRegionReplicaSet(devicesInRegion.keySet().iterator().next());
+ planNodesForRegions.add(node);
+ return planNodesForRegions;
+ }
+
+ for (Map.Entry<TRegionReplicaSet, Set<PartialPath>> entry :
devicesInRegion.entrySet()) {
+ RegionScanNode split = (RegionScanNode) node.clone();
+ split.setPlanNodeId(context.queryContext.getQueryId().genPlanNodeId());
+ split.setRegionReplicaSet(entry.getKey());
+ split.setDevicePaths(entry.getValue());
+ split.setOutputCount(isAllDeviceOnlyInOneRegion);
+ planNodesForRegions.add(split);
+ }
Review Comment:
getDevices may be duplicate.
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