static TruthValue evaluateBoolPredicate()

in c++/src/sargs/PredicateLeaf.cc [393:446]
52 lines of code
28 McCabe index (conditional complexity)

  static TruthValue evaluateBoolPredicate(const PredicateLeaf::Operator op,
                                          const std::vector<Literal>& literals,
                                          const proto::ColumnStatistics& stats) {
    bool hasNull = stats.has_null();
    if (!stats.has_bucket_statistics() || stats.bucket_statistics().count_size() == 0) {
      // does not have bool stats
      return hasNull ? TruthValue::YES_NO_NULL : TruthValue::YES_NO;
    }

    auto trueCount = stats.bucket_statistics().count(0);
    auto falseCount = stats.number_of_values() - trueCount;
    switch (op) {
      case PredicateLeaf::Operator::IS_NULL:
        return hasNull ? TruthValue::YES_NO : TruthValue::NO;
      case PredicateLeaf::Operator::NULL_SAFE_EQUALS: {
        if (literals.at(0).getBool()) {
          if (trueCount == 0) {
            return TruthValue::NO;
          } else if (falseCount == 0) {
            return TruthValue::YES;
          }
        } else {
          if (falseCount == 0) {
            return TruthValue::NO;
          } else if (trueCount == 0) {
            return TruthValue::YES;
          }
        }
        return TruthValue::YES_NO;
      }
      case PredicateLeaf::Operator::EQUALS: {
        if (literals.at(0).getBool()) {
          if (trueCount == 0) {
            return hasNull ? TruthValue::NO_NULL : TruthValue::NO;
          } else if (falseCount == 0) {
            return hasNull ? TruthValue::YES_NULL : TruthValue::YES;
          }
        } else {
          if (falseCount == 0) {
            return hasNull ? TruthValue::NO_NULL : TruthValue::NO;
          } else if (trueCount == 0) {
            return hasNull ? TruthValue::YES_NULL : TruthValue::YES;
          }
        }
        return hasNull ? TruthValue::YES_NO_NULL : TruthValue::YES_NO;
      }
      case PredicateLeaf::Operator::LESS_THAN:
      case PredicateLeaf::Operator::LESS_THAN_EQUALS:
      case PredicateLeaf::Operator::IN:
      case PredicateLeaf::Operator::BETWEEN:
      default:
        return hasNull ? TruthValue::YES_NO_NULL : TruthValue::YES_NO;
    }
  }