Examples with PartitionSpec org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PartitionSpec used on opensource projects

Example 6 with PartitionSpec

use of org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PartitionSpec in project hive by apache.

the class PTFTranslator method componentize.

public static ArrayList<PTFInvocationSpec> componentize(PTFInvocationSpec ptfInvocation) throws SemanticException {
    ArrayList<PTFInvocationSpec> componentInvocations = new ArrayList<PTFInvocationSpec>();
    Stack<PTFInputSpec> ptfChain = new Stack<PTFInvocationSpec.PTFInputSpec>();
    PTFInputSpec spec = ptfInvocation.getFunction();
    while (spec instanceof PartitionedTableFunctionSpec) {
        ptfChain.push(spec);
        spec = spec.getInput();
    }
    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) {
            PTFInvocationSpec component = new PTFInvocationSpec();
            component.setFunction(prevFn);
            componentInvocations.add(component);
            PTFQueryInputSpec cQInSpec = new PTFQueryInputSpec();
            cQInSpec.setType(PTFQueryInputType.PTFCOMPONENT);
            currentFn.setInput(cQInSpec);
        }
        prevFn = currentFn;
        partSpec = prevFn.getPartition();
        orderSpec = prevFn.getOrder();
    }
    componentInvocations.add(ptfInvocation);
    return componentInvocations;
}