imay commented on a change in pull request #246: Colocate Join (#245)
URL: https://github.com/apache/incubator-doris/pull/246#discussion_r231440902
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File path: fe/src/main/java/org/apache/doris/planner/DistributedPlanner.java
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@@ -395,6 +414,81 @@ private PlanFragment createHashJoinFragment(HashJoinNode
node, PlanFragment righ
}
}
+ private boolean canColocateJoin(HashJoinNode node, PlanFragment
leftChildFragment, PlanFragment rightChildFragment) {
+ if (ConnectContext.get().getSessionVariable().isDisableColocateJoin())
{
+ return false;
+ }
+
+ PlanNode leftRoot = leftChildFragment.getPlanRoot();
+ PlanNode rightRoot = rightChildFragment.getPlanRoot();
+
+ //leftRoot could be ScanNode or HashJoinNode, rightRoot should be
ScanNode
+ if (leftRoot instanceof OlapScanNode && rightRoot instanceof
OlapScanNode) {
+ return canColocateJoin(node, leftRoot, rightRoot);
+ }
+
+ if (leftRoot instanceof HashJoinNode && rightRoot instanceof
OlapScanNode) {
+ while (leftRoot instanceof HashJoinNode) {
+ if (((HashJoinNode)leftRoot).isColocate()) {
+ leftRoot = leftRoot.getChild(0);
+ } else {
+ return false;
+ }
+ }
Review comment:
Other node can be `HashJoinNode`'s left node, so you should check
`leftRoot`'s type.
For example: select * from (select id from t1 group id) a, (select id from
t2 group by id) b where a.id = b.id;
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