// create a syntax tree for a function call "testudf(col0, col1, col2)"
ExprNodeGenericFuncDesc funcDesc;
TypeInfo typeInfoStr = TypeInfoFactory.stringTypeInfo;
TypeInfo typeInfoLong = TypeInfoFactory.longTypeInfo;
TypeInfo typeInfoDbl = TypeInfoFactory.doubleTypeInfo;
GenericUDFBridge genericUDFBridge = new GenericUDFBridge("testudf", false,
ConcatTextLongDoubleUDF.class.getName());
List<ExprNodeDesc> children = new ArrayList<ExprNodeDesc>();
children.add(new ExprNodeColumnDesc(typeInfoStr, "col0", "tablename", false));
children.add(new ExprNodeColumnDesc(typeInfoLong, "col1", "tablename", false));
children.add(new ExprNodeColumnDesc(typeInfoDbl, "col2", "tablename", false));
VectorUDFArgDesc[] argDescs = new VectorUDFArgDesc[3];
for (int i = 0; i < 3; i++) {
argDescs[i] = new VectorUDFArgDesc();
argDescs[i].setVariable(i);
}
funcDesc = new ExprNodeGenericFuncDesc(typeInfoStr, genericUDFBridge,
genericUDFBridge.getUdfName(), children);
// create the adaptor for this function call to work in vector mode
VectorUDFAdaptor vudf = null;
try {
vudf = new VectorUDFAdaptor(funcDesc, 3, "String", argDescs);