feat(nanos): timestamp column use nanos precision.

src/net-questdb-client-tests/HttpTests.cs

@@ -747,7 +747,45 @@ await sender.Table("name")
         await sender.SendAsync();
 
         var expected =
-            "name ts=1645660800000000t 1645660800000000000\n";
+            "name ts=1645660800000000000n 1645660800000000000\n";
+        Assert.That(srv.PrintBuffer(), Is.EqualTo(expected));
+    }
+
+    [Test]
+    public async Task SendColumnNanos()
+    {
+        using var srv = new DummyHttpServer();
+        await srv.StartAsync(HttpPort);
+        using var sender = Sender.New($"http::addr={Host}:{HttpPort};auto_flush=off;");
+
+        const long timestampNanos = 1645660800123456789L;
+        await sender.Table("name")
+                    .ColumnNanos("ts", timestampNanos)
+                    .AtAsync(timestampNanos);
+
+        await sender.SendAsync();
+
+        var expected =
+            "name ts=1645660800123456789n 1645660800123456789\n";
+        Assert.That(srv.PrintBuffer(), Is.EqualTo(expected));
+    }
+
+    [Test]
+    public async Task SendAtNanos()
+    {
+        using var srv = new DummyHttpServer();
+        await srv.StartAsync(HttpPort);
+        using var sender = Sender.New($"http::addr={Host}:{HttpPort};auto_flush=off;");
+
+        const long timestampNanos = 1645660800987654321L;
+        await sender.Table("name")
+                    .Column("value", 42)
+                    .AtNanosAsync(timestampNanos);
+
+        await sender.SendAsync();
+
+        var expected =
+            "name value=42i 1645660800987654321\n";
         Assert.That(srv.PrintBuffer(), Is.EqualTo(expected));
     }
 
@@ -1163,7 +1201,7 @@ public async Task TransactionMultipleTypes()
         await sender.CommitAsync();
 
         var expected =
-            "tableName,foo=bah 86400000000000\ntableName foo=123i 86400000000000\ntableName foo=123 86400000000000\ntableName foo=0t 86400000000000\ntableName foo=-3600000000t 86400000000000\ntableName foo=f 86400000000000\n";
+            "tableName,foo=bah 86400000000000\ntableName foo=123i 86400000000000\ntableName foo=123 86400000000000\ntableName foo=0n 86400000000000\ntableName foo=-3600000000000n 86400000000000\ntableName foo=f 86400000000000\n";
         Assert.That(srv.PrintBuffer(), Is.EqualTo(expected));
     }
 

src/net-questdb-client-tests/TcpTests.cs

@@ -335,7 +335,47 @@ await sender.Table("name")
         await sender.SendAsync();
 
         var expected =
-            "name ts=1645660800000000t 1645660800000000000\n";
+            "name ts=1645660800000000000n 1645660800000000000\n";
+        WaitAssert(srv, expected);
+    }
+
+    [Test]
+    public async Task SendColumnNanos()
+    {
+        using var srv = CreateTcpListener(_port);
+        srv.AcceptAsync();
+
+        using var sender = Sender.New($"tcp::addr={_host}:{_port};");
+
+        const long timestampNanos = 1645660800123456789L;
+        await sender.Table("name")
+                    .ColumnNanos("ts", timestampNanos)
+                    .AtAsync(timestampNanos);
+
+        await sender.SendAsync();
+
+        var expected =
+            "name ts=1645660800123456789n 1645660800123456789\n";
+        WaitAssert(srv, expected);
+    }
+
+    [Test]
+    public async Task SendAtNanos()
+    {
+        using var srv = CreateTcpListener(_port);
+        srv.AcceptAsync();
+
+        using var sender = Sender.New($"tcp::addr={_host}:{_port};");
+
+        const long timestampNanos = 1645660800987654321L;
+        await sender.Table("name")
+                    .Column("value", 42)
+                    .AtNanosAsync(timestampNanos);
+
+        await sender.SendAsync();
+
+        var expected =
+            "name value=42i 1645660800987654321\n";
         WaitAssert(srv, expected);
     }
 

src/net-questdb-client/Buffers/BufferV1.cs

@@ -108,7 +108,7 @@ public void AtNow()
     public void At(DateTime timestamp)
     {
         var epoch = timestamp.Ticks - EpochTicks;
-        PutAscii(' ').Put(epoch).PutAscii('0').PutAscii('0');
+        PutAscii(' ').Put(epoch * 100);
         FinishLine();
     }
 
@@ -125,6 +125,13 @@ public void At(long epochNano)
         FinishLine();
     }
 
+    /// <inheritdoc />
+    public void AtNanos(long timestampNanos)
+    {
+        PutAscii(' ').Put(timestampNanos);
+        FinishLine();
+    }
+
     /// <inheritdoc />
     public void Clear()
     {
@@ -317,7 +324,7 @@ public IBuffer Column(ReadOnlySpan<char> name, DateTime timestamp)
         }
 
         var epoch = timestamp.Ticks - EpochTicks;
-        Column(name).Put(epoch / 10).PutAscii('t');
+        Column(name).Put(epoch * 100).PutAscii('n');
         return this;
     }
 
@@ -333,6 +340,18 @@ public IBuffer Column(ReadOnlySpan<char> name, DateTimeOffset timestamp)
         return this;
     }
 
+    /// <inheritdoc />
+    public IBuffer ColumnNanos(ReadOnlySpan<char> name, long timestampNanos)
+    {
+        if (WithinTransaction && !_hasTable)
+        {
+            Table(_currentTableName);
+        }
+
+        Column(name).Put(timestampNanos).PutAscii('n');
+        return this;
+    }
+
     /// <summary />
     public IBuffer EncodeUtf8(ReadOnlySpan<char> name)
     {

src/net-questdb-client/Buffers/IBuffer.cs

@@ -140,6 +140,14 @@ public interface IBuffer
     /// <returns>Itself</returns>
     public IBuffer Column(ReadOnlySpan<char> name, DateTimeOffset timestamp);
 
+    /// <summary>
+    ///     Set value of TIMESTAMP column with exact nanosecond precision.
+    /// </summary>
+    /// <param name="name">Column name</param>
+    /// <param name="timestampNanos">Nanoseconds since Unix epoch</param>
+    /// <returns>Itself</returns>
+    public IBuffer ColumnNanos(ReadOnlySpan<char> name, long timestampNanos);
+
     /// <summary>
     ///     Finishes the line without specifying Designated Timestamp. QuestDB will set the timestamp at the time of writing to
     ///     the table.
@@ -164,6 +172,12 @@ public interface IBuffer
     /// <param name="epochNano">Nanoseconds since Unix epoch</param>
     public void At(long epochNano);
 
+    /// <summary>
+    ///     Finishes the line setting timestamp with exact nanosecond precision.
+    /// </summary>
+    /// <param name="timestampNanos">Nanoseconds since Unix epoch</param>
+    public void AtNanos(long timestampNanos);
+
     /// <summary>
     ///     Clears the buffer.
     /// </summary>

src/net-questdb-client/Senders/AbstractSender.cs

@@ -122,6 +122,13 @@ public ISender Column(ReadOnlySpan<char> name, DateTimeOffset value)
         return this;
     }
 
+    /// <inheritdoc />
+    public ISender ColumnNanos(ReadOnlySpan<char> name, long timestampNanos)
+    {
+        Buffer.ColumnNanos(name, timestampNanos);
+        return this;
+    }
+
     public ISender Column<T>(ReadOnlySpan<char> name, IEnumerable<T> value, IEnumerable<int> shape) where T : struct
     {
         Buffer.Column(name, value, shape);
@@ -196,6 +203,22 @@ public void At(long value, CancellationToken ct = default)
         FlushIfNecessary(ct);
     }
 
+    /// <inheritdoc />
+    public ValueTask AtNanosAsync(long timestampNanos, CancellationToken ct = default)
+    {
+        GuardLastFlushNotSet();
+        Buffer.AtNanos(timestampNanos);
+        return FlushIfNecessaryAsync(ct);
+    }
+
+    /// <inheritdoc />
+    public void AtNanos(long timestampNanos, CancellationToken ct = default)
+    {
+        GuardLastFlushNotSet();
+        Buffer.AtNanos(timestampNanos);
+        FlushIfNecessary(ct);
+    }
+
     /// <inheritdoc />
     public void AtNow(CancellationToken ct = default)
     {

src/net-questdb-client/Senders/ISender.cs

@@ -149,6 +149,14 @@ public interface ISenderV1 : IDisposable
     /// <inheritdoc cref="Column(System.ReadOnlySpan{char},System.ReadOnlySpan{char})" />
     public ISender Column(ReadOnlySpan<char> name, DateTimeOffset value);
 
+    /// <summary>
+    ///     Adds a timestamp column with exact nanosecond precision.
+    /// </summary>
+    /// <param name="name">The name of the column</param>
+    /// <param name="timestampNanos">Nanoseconds since Unix epoch</param>
+    /// <returns>Itself</returns>
+    public ISender ColumnNanos(ReadOnlySpan<char> name, long timestampNanos);
+
     /// <summary>
     ///     Adds a value for the designated timestamp column.
     /// </summary>
@@ -180,6 +188,17 @@ public interface ISenderV1 : IDisposable
     /// <inheritdoc cref="AtAsync(DateTime, CancellationToken)" />
     public void At(long value, CancellationToken ct = default);
 
+    /// <summary>
+    ///     Adds exact nanosecond precision timestamp for the designated timestamp column.
+    /// </summary>
+    /// <param name="timestampNanos">Nanoseconds since Unix epoch</param>
+    /// <param name="ct">A cancellation token applied requests caused by auto-flushing</param>
+    /// <returns>Itself</returns>
+    public ValueTask AtNanosAsync(long timestampNanos, CancellationToken ct = default);
+
+    /// <inheritdoc cref="AtNanosAsync" />
+    public void AtNanos(long timestampNanos, CancellationToken ct = default);
+
     /// <inheritdoc cref="AtNowAsync" />
     [Obsolete("Not compatible with deduplication. Please use `At(DateTime.UtcNow)` instead.")]
     public void AtNow(CancellationToken ct = default);