RavenDb“输入”操作员如何工作？

Question

我可能不了解RavenDb中“ In”扩展方法的工作方式。 我认为这与SQL世界中的IN命令等效，例如WHERE Number IN（1、2、3）。 但是它的行为很奇怪。

// i have 3 records - two with Normal severity, one with Low severity
using (var session = store.OpenSession())
{
    session.Store(new TestObject { Name = "o1", Severity = Severity.Normal });
    session.Store(new TestObject { Name = "o2", Severity = Severity.Low });
    session.Store(new TestObject { Name = "o3", Severity = Severity.Normal });
    session.SaveChanges();
}

// this writes the Low severity record, it seems correct
using (var session = store.OpenSession())
{
    var data = session.Query<TestObject>()
        .Where(o => o.Severity.In(new[] { Severity.Low }))
        .OrderBy(o => o.Name).ToList();
    data.ForEach(r => Console.WriteLine(r));
}

// this writes also the Low severity record, it still seems correct
using (var session = store.OpenSession())
{
    var data = session.Query<TestObject>()
        .Where(o => o.Severity.In(new[] { Severity.Low, Severity.High }))
        .OrderBy(o => o.Name).ToList();
    data.ForEach(r => Console.WriteLine(r));
}

// this writes all records, still seems correct
using (var session = store.OpenSession())
{
    var data = session.Query<TestObject>()
        .Where(o => o.Severity.In(
            new[] { Severity.High, Severity.Low, Severity.Normal }))
        .OrderBy(o => o.Name).ToList();
    data.ForEach(r => Console.WriteLine(r));
}

// but this does not write anything 
// despite there are 2 records with Normal severity
using (var session = store.OpenSession())
{
    var data = session.Query<TestObject>()
        .Where(o => o.Severity.In(new[] { Severity.High, Severity.Normal }))
        .OrderBy(o => o.Name).ToList();
    data.ForEach(r => Console.WriteLine(r));
}

// and this does not write anything either, 
// I just tried whether the order of values in the array matters
using (var session = store.OpenSession())
{
    var data = session.Query<TestObject>()
        .Where(o => o.Severity.In(new[] { Severity.Normal, Severity.High }))
        .OrderBy(o => o.Name).ToList();
    data.ForEach(r => Console.WriteLine(r));
}

还是在RavenDb / Lucene引擎中发现错误？

编辑

我发现了另一件事。 它必须与枚举成员的字母顺序有关。 当我将Severity.Normal重命名为Severity.A时，最后两个查询的行为正确并返回结果。 当我将Severity.Normal重命名为Severity.La时，它仍然有效（因为La <Low）。 但是，当我将Severity.Normal重命名为Severity.Lu（Lu> Low）时，它中断了，最后两个查询不再返回结果。 原始样本不起作用，因为“正常”>“低”。 但是我仍然想知道为什么会发生，因为这对我来说毫无意义。

Answer 1

您遇到了过时的索引，这就是为什么您会得到奇怪的结果的原因。 您需要等待索引首先完成。