Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/24#discussion_r13266983
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/planner/global/GlobalPlanner.java
---
@@ -1195,10 +1192,59 @@ public LogicalNode
visitTableSubQuery(GlobalPlanContext context, LogicalPlan pla
ExecutionBlock currentBlock =
context.execBlockMap.remove(child.getPID());
if (child.getType() == NodeType.UNION) {
+ List<TableSubQueryNode> addedTableSubQueries = new
ArrayList<TableSubQueryNode>();
+ TableSubQueryNode leftMostUnionNode = null;
for (ExecutionBlock childBlock :
context.plan.getChilds(currentBlock.getId())) {
TableSubQueryNode copy = PlannerUtil.clone(plan, node);
copy.setSubQuery(childBlock.getPlan());
childBlock.setPlan(copy);
+ addedTableSubQueries.add(copy);
+
+ //Find a SubQueryNode which contains all columns in InputSchema
matched with Target and OutputSchema's column
+ if
(copy.getInSchema().containsAll(copy.getOutSchema().getColumns())) {
+ for (Target eachTarget : copy.getTargets()) {
+ Set<Column> columns =
EvalTreeUtil.findUniqueColumns(eachTarget.getEvalTree());
+ if (copy.getInSchema().containsAll(columns)) {
+ leftMostUnionNode = copy;
--- End diff --
Did you intend to find TableSubQuery node which contains at least one
target? If you did, 'break' may be required.
But, do we need to find TableSubQuery which contains all the targets?
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