[jira] (IGNITE-18257) .NET: Thin 3.0: LINQ: Type casts

[Pavel Tupitsyn (Jira)]

    [ https://issues.apache.org/jira/browse/IGNITE-18257 ]


    Pavel Tupitsyn deleted comment on IGNITE-18257:
    -----------------------------------------

was (Author: ptupitsyn):
Update *VisitUnary* like this:
{code}
    protected override Expression VisitUnary(UnaryExpression expression)
    {
        var closeBracket = false;

        switch (expression.NodeType)
        {
            case ExpressionType.Negate:
                ResultBuilder.Append("(-");
                closeBracket = true;
                break;

            case ExpressionType.Not:
                ResultBuilder.Append("(not ");
                closeBracket = true;
                break;

            case ExpressionType.Convert:
                ResultBuilder.Append("cast(");

                break;

            default:
                return base.VisitUnary(expression);
        }

        Visit(expression.Operand);

        if (closeBracket)
        {
            ResultBuilder.Append(')');
        }
        else if (expression.NodeType is ExpressionType.Convert)
        {
            ResultBuilder.Append(" as ");

            // TODO: One-step type conversion (here and in other places).
            var sqlColumnType = expression.Type.ToSqlColumnType() ??
                                throw new NotSupportedException("Unsupported 
type: " + expression.Type);

            var sqlTypeName = sqlColumnType.ToSqlTypeName();

            ResultBuilder.Append(sqlTypeName).Append(')');
        }

        return expression;
    }
{code}

> .NET: Thin 3.0: LINQ: Type casts
> --------------------------------
>
>                 Key: IGNITE-18257
>                 URL: https://issues.apache.org/jira/browse/IGNITE-18257
>             Project: Ignite
>          Issue Type: Improvement
>          Components: platforms, thin client
>            Reporter: Pavel Tupitsyn
>            Assignee: Pavel Tupitsyn
>            Priority: Major
>              Labels: .NET, LINQ, ignite-3
>             Fix For: 3.0.0-beta2
>
>
> Implement type casts when necessary. Users should be able to compare, 
> project, join and perform other operations on different column types.



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