private ObjectInspector initExprNodeEvaluator(
ExprNodeEvaluator exprEval, ExprNodeDesc exprNode, ShapeDetails inpShape)
throws HiveException {
ObjectInspector outOI;
outOI = exprEval.initialize(inpShape.getOI());
/*
* if there are any LeadLag functions in this Expression Tree: - setup a
* duplicate Evaluator for the 1st arg of the LLFuncDesc - initialize it
* using the InputInfo provided for this Expr tree - set the duplicate
* evaluator on the LLUDF instance.
*/
List<ExprNodeGenericFuncDesc> llFuncExprs = llInfo.getLLFuncExprsInTopExpr(exprNode);
if (llFuncExprs != null) {
for (ExprNodeGenericFuncDesc llFuncExpr : llFuncExprs) {
ExprNodeDesc firstArg = llFuncExpr.getChildren().get(0);
ExprNodeEvaluator dupExprEval = WindowingExprNodeEvaluatorFactory.get(llInfo, firstArg);
dupExprEval.initialize(inpShape.getOI());
GenericUDFLeadLag llFn = (GenericUDFLeadLag) llFuncExpr.getGenericUDF();
llFn.setExprEvaluator(dupExprEval);
}
}
return outOI;
}
private static void addInputColumnsToList(
ShapeDetails shape, ArrayList<String> fieldNames, ArrayList<ObjectInspector> fieldOIs) {
StructObjectInspector OI = shape.getOI();
for (StructField f : OI.getAllStructFieldRefs()) {
fieldNames.add(f.getFieldName());
fieldOIs.add(f.getFieldObjectInspector());
}
}
protected void initialize(ShapeDetails shp, StructObjectInspector OI) throws HiveException {
String serdeClassName = shp.getSerdeClassName();
Properties serDeProps = new Properties();
Map<String, String> serdePropsMap = new LinkedHashMap<String, String>();
addOIPropertiestoSerDePropsMap(OI, serdePropsMap);
for (String serdeName : serdePropsMap.keySet()) {
serDeProps.setProperty(serdeName, serdePropsMap.get(serdeName));
}
try {
SerDe serDe = (SerDe) SerDeUtils.lookupDeserializer(serdeClassName);
serDe.initialize(hConf, serDeProps);
shp.setSerde(serDe);
shp.setOI((StructObjectInspector) serDe.getObjectInspector());
} catch (SerDeException se) {
throw new HiveException(se);
}
}