private RelationalNode convertPlan(PlanNode planNode)
throws TeiidComponentException, TeiidProcessingException {
// Convert current node in planTree
RelationalNode convertedNode = convertNode(planNode);
if (convertedNode == null) {
Assertion.assertTrue(planNode.getChildCount() == 1);
return convertPlan(planNode.getFirstChild());
}
RelationalNode nextParent = convertedNode;
// convertedNode may be the head of 1 or more nodes - go to end of chain
while (nextParent.getChildren()[0] != null) {
nextParent = nextParent.getChildren()[0];
}
// Call convertPlan recursively on children
for (PlanNode childNode : planNode.getChildren()) {
RelationalNode child = convertPlan(childNode);
if (planNode.getType() == NodeConstants.Types.SET_OP
&& nextParent instanceof UnionAllNode
&& childNode.getProperty(Info.SET_OPERATION) == childNode.getProperty(Info.SET_OPERATION)
&& childNode.getType() == NodeConstants.Types.SET_OP
&& childNode.hasBooleanProperty(Info.USE_ALL)) {
for (RelationalNode grandChild : child.getChildren()) {
if (grandChild != null) {
nextParent.addChild(grandChild);
}
}
} else {
nextParent.addChild(child);
}
}
// Return root of tree for top node
return convertedNode;
}
