private boolean validateFilterOperator(FilterOperator op) {
    ExprNodeDesc desc = op.getConf().getPredicate();
    return validateExprNodeDesc(
        desc, "Predicate", VectorExpressionDescriptor.Mode.FILTER, /* allowComplex */ true);
  }
Decimal types can be specified with different precision and scales e.g. decimal(10,5),
as opposed to other data types which can be represented by constant strings.
The regex matches only the {@link serdeConstants#DECIMAL_TYPE_NAME} prefix of the type.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/Vectorizer.java