public ExprNodeGenericFuncEvaluator(ExprNodeGenericFuncDesc expr) {
this.expr = expr;
children = new ExprNodeEvaluator[expr.getChildExprs().size()];
isEager = false;
for (int i = 0; i < children.length; i++) {
ExprNodeDesc child = expr.getChildExprs().get(i);
ExprNodeEvaluator nodeEvaluator = ExprNodeEvaluatorFactory.get(child);
children[i] = nodeEvaluator;
// If we have eager evaluators anywhere below us, then we are eager too.
if (nodeEvaluator instanceof ExprNodeGenericFuncEvaluator) {
if (((ExprNodeGenericFuncEvaluator) nodeEvaluator).isEager) {
isEager = true;
}
// Base case: we are eager if a child is stateful
GenericUDF childUDF = ((ExprNodeGenericFuncDesc) child).getGenericUDF();
if (FunctionRegistry.isStateful(childUDF)) {
isEager = true;
}
}
}
deferredChildren = new GenericUDF.DeferredObject[expr.getChildExprs().size()];
for (int i = 0; i < deferredChildren.length; i++) {
if (isEager) {
deferredChildren[i] = new EagerExprObject(children[i]);
} else {
deferredChildren[i] = new DeferredExprObject(children[i]);
}
}
}
