Method isConstant

src/binder/expression_visitor.cpp:261–300

}

bool ConstantExpressionVisitor::isConstant(const Expression& expr) {
    if (ExpressionVisitor::isRandom(expr)) {
        return false;
    }
    switch (expr.expressionType) {
    case ExpressionType::LITERAL:
        return true;
    case ExpressionType::AGGREGATE_FUNCTION:
    case ExpressionType::PROPERTY:
    case ExpressionType::VARIABLE:
    case ExpressionType::PATH:
    case ExpressionType::PATTERN:
    case ExpressionType::PARAMETER:
    case ExpressionType::SUBQUERY:
    case ExpressionType::GRAPH:
    case ExpressionType::LAMBDA:
        return false;
    case ExpressionType::FUNCTION:
        return visitFunction(expr);
    case ExpressionType::CASE_ELSE:
        return visitCase(expr);
    case ExpressionType::OR:
    case ExpressionType::XOR:
    case ExpressionType::AND:
    case ExpressionType::NOT:
    case ExpressionType::EQUALS:
    case ExpressionType::NOT_EQUALS:
    case ExpressionType::GREATER_THAN:
    case ExpressionType::GREATER_THAN_EQUALS:
    case ExpressionType::LESS_THAN:
    case ExpressionType::LESS_THAN_EQUALS:
    case ExpressionType::IS_NULL:
    case ExpressionType::IS_NOT_NULL:
        return visitChildren(expr);
        // LCOV_EXCL_START
    default:
        throw NotImplementedException("ConstantExpressionVisitor::isConstant");
        // LCOV_EXCL_STOP
    }
}

bool ConstantExpressionVisitor::visitFunction(const Expression& expr) {
    auto& funcExpr = expr.constCast<ScalarFunctionExpression>();