Examples with TableFunctionResolver com.sap.hadoop.windowing.functions2.TableFunctionResolver used on opensource projects

Example 1 with TableFunctionResolver

use of com.sap.hadoop.windowing.functions2.TableFunctionResolver in project SQLWindowing by hbutani.

the class InputTranslation method translate.

/*
	 * <ol>
	 * <li> Get the <code>TableFunctionResolver</code> for this Function from the FunctionRegistry.
	 * <li> Create the TableFuncDef object.
	 * <li> Get the InputInfo for the input to this function.
	 * <li> Translate the Arguments to this Function in the Context of the InputInfo.
	 * <li> ask the  TableFunctionResolver to create a TableFunctionEvaluator based on the Args passed in.
	 * <li> ask the TableFunctionEvaluator to setup the Map-side ObjectInspector. Gives a chance to functions that 
	 * reshape the Input before it is partitioned to define the Shape after raw data is transformed.
	 * <li> Setup the Window Definition for this Function. The Window Definition is resolved wrt to the InputDef's
	 * Shape or the MapOI, for Functions that reshape the raw input.
	 * <li> ask the TableFunctionEvaluator to setup the Output ObjectInspector for this Function.
	 * <li> setup a Serde for the Output partition based on the OutputOI. 
	 * </ol> 
	 */
private static TableFuncDef translate(QueryDef qDef, TableFuncSpec tSpec, QueryInputDef inputDef) throws WindowingException {
    QueryTranslationInfo tInfo = qDef.getTranslationInfo();
    TableFunctionResolver tFn = FunctionRegistry.getTableFunctionResolver(tSpec.getName());
    if (tFn == null) {
        throw new WindowingException(sprintf("Unknown Table Function %s", tSpec.getName()));
    }
    TableFuncDef tDef = new TableFuncDef();
    tDef.setSpec(tSpec);
    tDef.setInput(inputDef);
    InputInfo iInfo = tInfo.getInputInfo(inputDef);
    /*
		 * translate args
		 */
    ArrayList<ASTNode> args = tSpec.getArgs();
    if (args != null) {
        for (ASTNode expr : args) {
            ArgDef argDef = translateTableFunctionArg(qDef, tDef, iInfo, expr);
            tDef.addArg(argDef);
        }
    }
    tFn.initialize(qDef, tDef);
    TableFunctionEvaluator tEval = tFn.getEvaluator();
    tDef.setFunction(tEval);
    tFn.setupRawInputOI();
    tDef.setWindow(WindowSpecTranslation.translateWindow(qDef, tDef));
    tFn.setupOutputOI();
    TranslateUtils.setupSerdeAndOI(tDef, inputDef, tInfo, tEval);
    return tDef;
}