Method tryCombineDataType

src/binder/expression/expression_util.cpp:388–415

}

bool ExpressionUtil::tryCombineDataType(const expression_vector& expressions, LogicalType& result) {
    std::vector<Value> secondaryValues;
    std::vector<LogicalType> primaryTypes;
    for (auto& expr : expressions) {
        if (expr->expressionType != ExpressionType::LITERAL) {
            primaryTypes.push_back(expr->getDataType().copy());
            continue;
        }
        auto literalExpr = expr->constPtrCast<LiteralExpression>();
        if (literalExpr->getValue().allowTypeChange()) {
            secondaryValues.push_back(literalExpr->getValue());
            continue;
        }
        primaryTypes.push_back(expr->getDataType().copy());
    }
    if (!LogicalTypeUtils::tryGetMaxLogicalType(primaryTypes, result)) {
        return false;
    }
    for (auto& value : secondaryValues) {
        if (compatible(value, result)) {
            continue;
        }
        if (!LogicalTypeUtils::tryGetMaxLogicalType(result, value.getDataType(), result)) {
            return false;
        }
    }
    return true;
}

bool ExpressionUtil::canCastStatically(const Expression& expr, const LogicalType& targetType) {
    switch (expr.expressionType) {