/*
* validate and setup resultExprStr
*/
private void validateAndSetupResultExprStr(
MatchPath evaluator, List<PTFExpressionDef> args, int argsNum) throws SemanticException {
PTFExpressionDef resultExprArg = args.get(argsNum - 1);
ObjectInspector resultExprArgOI = resultExprArg.getOI();
if (!ObjectInspectorUtils.isConstantObjectInspector(resultExprArgOI)
|| (resultExprArgOI.getCategory() != ObjectInspector.Category.PRIMITIVE)
|| ((PrimitiveObjectInspector) resultExprArgOI).getPrimitiveCategory()
!= PrimitiveObjectInspector.PrimitiveCategory.STRING) {
throwErrorWithSignature("Currently the result Expr parameter must be a Constant String.");
}
evaluator.resultExprStr =
((ConstantObjectInspector) resultExprArgOI).getWritableConstantValue().toString();
}
