}
PartitionedTableFunctionSpec prevFn = (PartitionedTableFunctionSpec) ptfChain.pop();
applyConstantPartition(prevFn);
PartitionSpec partSpec = prevFn.getPartition();
OrderSpec orderSpec = prevFn.getOrder();
if ( partSpec == null ) {
//oops this should have been caught before trying to componentize
throw new SemanticException(
"No Partitioning specification specified at start of a PTFChain");
}
if ( orderSpec == null ) {
orderSpec = new OrderSpec(partSpec);
prevFn.setOrder(orderSpec);
}
while (!ptfChain.isEmpty()) {
PartitionedTableFunctionSpec currentFn = (PartitionedTableFunctionSpec) ptfChain.pop();
String fnName = currentFn.getName();
if (!FunctionRegistry.isTableFunction(fnName)) {
throw new SemanticException(ErrorMsg.INVALID_FUNCTION.getMsg(fnName));
}
boolean transformsRawInput = FunctionRegistry.getTableFunctionResolver(fnName)
.transformsRawInput();
/*
* if the current table function has no partition info specified: inherit it from the PTF up
* the chain.
*/
if (currentFn.getPartition() == null) {
currentFn.setPartition(prevFn.getPartition());
if (currentFn.getOrder() == null) {
currentFn.setOrder(prevFn.getOrder());
}
}
/*
* If the current table function has no order info specified;
*/
if (currentFn.getOrder() == null) {
currentFn.setOrder(new OrderSpec(currentFn.getPartition()));
}
if (!currentFn.getPartition().equals(partSpec) ||
!currentFn.getOrder().equals(orderSpec) ||
transformsRawInput) {