[Bug-Fix] Bucket shuffle join executes failed when two tables have no…

… data (apache#5145)

Bucket shuffle join is an algorithm of joining two tables. Left table is distributed by a column.
Right table sends the data to the left table for joining operation.
It reduces the network cost. But when two table is without any data. Bucket shuffle join will fail.

Related Issue: apache#5144

fe/fe-core/src/main/java/org/apache/doris/planner/DistributedPlanner.java

@@ -545,7 +545,7 @@ private boolean canBucketShuffleJoin(HashJoinNode node, PlanNode leftRoot,
         OlapScanNode leftScanNode = ((OlapScanNode) leftRoot);
 
         //1 the left table must be only one partition
-        if (leftScanNode.getSelectedPartitionIds().size() > 1) {
+        if (leftScanNode.getSelectedPartitionIds().size() != 1) {
             return false;
         }