Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/24#discussion_r13266942
--- 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())) {
--- End diff --
This is just a question. When doesn't InputSchema contain all columns of
OutSchema?
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