feat(csharpclient): First pass at a C# client

csharp/.gitignore

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+.vs/
+bin/
+obj/

csharp/client/DeephavenClient/AggregateCombo.cs

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+using System;
+using System.Runtime.InteropServices;
+using Deephaven.DeephavenClient.Interop;
+
+namespace Deephaven.DeephavenClient;
+
+public class AggregateCombo {
+  private readonly Aggregate[] _aggregates;
+
+  public AggregateCombo(IEnumerable<Aggregate> aggregates) => _aggregates = aggregates.ToArray();
+
+  internal InternalAggregateCombo Invoke() {
+    return new InternalAggregateCombo(_aggregates);
+  }
+}
+
+internal class InternalAggregateCombo : IDisposable {
+  internal NativePtr<NativeAggregateCombo> Self;
+
+  internal InternalAggregateCombo(Aggregate[] aggregates) {
+    var internalAggregates = new List<InternalAggregate>();
+    try {
+      // Invoke the lazy method on the aggregate to get its C++ wrapper
+      foreach (var agg in aggregates) {
+        internalAggregates.Add(agg.Materialize());
+      }
+
+      var internalAggPtrs = internalAggregates.Select(ag => ag.Self).ToArray();
+      NativeAggregateCombo.deephaven_client_AggregateCombo_Create(
+        internalAggPtrs, internalAggPtrs.Length, out var result, out var status);
+      status.OkOrThrow();
+      Self = result;
+    } finally {
+      foreach (var agg in internalAggregates) {
+        agg.Dispose();
+      }
+    }
+  }
+
+  ~InternalAggregateCombo() {
+    ReleaseUnmanagedResources();
+  }
+
+  public void Dispose() {
+    ReleaseUnmanagedResources();
+    GC.SuppressFinalize(this);
+  }
+
+  private void ReleaseUnmanagedResources() {
+    if (!Self.TryRelease(out var old)) {
+      return;
+    }
+    NativeAggregateCombo.deephaven_client_AggregateCombo_dtor(old);
+  }
+}
+
+internal partial class NativeAggregateCombo {
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_AggregateCombo_Create(
+    NativePtr<NativeAggregate>[] aggregates, Int32 numAggregates,
+    out NativePtr<NativeAggregateCombo> self, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_AggregateCombo_dtor(NativePtr<NativeAggregateCombo> self);
+}

csharp/client/DeephavenClient/Aggregates.cs

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+using System;
+using System.Runtime.InteropServices;
+using Deephaven.DeephavenClient.Interop;
+
+namespace Deephaven.DeephavenClient;
+
+public class Aggregate {
+  [UnmanagedFunctionPointer(CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
+  private delegate void AggregateMethod(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+
+  [UnmanagedFunctionPointer(CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
+  private delegate void LazyMaterializer(out NativePtr<NativeAggregate> result, out ErrorStatus status);
+
+  public static Aggregate AbsSum(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_AbsSum);
+  }
+
+  public static Aggregate Group(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Group);
+  }
+
+  public static Aggregate Avg(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Avg);
+  }
+
+  public static Aggregate First(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_First);
+  }
+
+  public static Aggregate Last(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Last);
+  }
+
+  public static Aggregate Max(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Max);
+  }
+
+  public static Aggregate Med(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Med);
+  }
+
+  public static Aggregate Min(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Min);
+  }
+
+  public static Aggregate Std(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Std);
+  }
+
+  public static Aggregate Sum(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Sum);
+  }
+
+  public static Aggregate Var(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_Var);
+  }
+
+  public static Aggregate WAvg(IEnumerable<string> columnSpecs) {
+    return CreateHelper(columnSpecs, NativeAggregate.deephaven_client_Aggregate_WAvg);
+  }
+
+  public static Aggregate Count(string columnSpec) {
+    LazyMaterializer lazyMaterializer = (out NativePtr<NativeAggregate> result, out ErrorStatus status) =>
+      NativeAggregate.deephaven_client_Aggregate_Count(columnSpec, out result, out status);
+    return new Aggregate(lazyMaterializer);
+  }
+
+  public static Aggregate Pct(double percentile, bool avgMedian, IEnumerable<string> columnSpecs) {
+    var cols = columnSpecs.ToArray();
+    LazyMaterializer lazyMaterializer = (out NativePtr<NativeAggregate> result, out ErrorStatus status) =>
+      NativeAggregate.deephaven_client_Aggregate_Pct(percentile, (InteropBool)avgMedian,
+        cols, cols.Length, out result, out status);
+    return new Aggregate(lazyMaterializer);
+  }
+
+  /// <summary>
+  /// Helper method for all the Aggregate functions except Count, which is special because
+  /// it takes a string rather than an IEnumerable&lt;string&gt;
+  /// </summary>
+  private static Aggregate CreateHelper(IEnumerable<string> columnSpecs, AggregateMethod aggregateMethod) {
+    var cs = columnSpecs.ToArray();
+
+    LazyMaterializer lazyMaterializer = (out NativePtr<NativeAggregate> result, out ErrorStatus status) =>
+      aggregateMethod(cs, cs.Length, out result, out status);
+
+    return new Aggregate(lazyMaterializer);
+  }
+
+  private readonly LazyMaterializer _lazyMaterializer;
+
+  private Aggregate(LazyMaterializer lazyMaterializer) => _lazyMaterializer = lazyMaterializer;
+
+  internal InternalAggregate Materialize() {
+    _lazyMaterializer(out var result, out var status);
+    status.OkOrThrow();
+    return new InternalAggregate(result);
+  }
+}
+
+internal class InternalAggregate : IDisposable {
+  internal NativePtr<NativeAggregate> Self;
+
+  internal InternalAggregate(NativePtr<NativeAggregate> self) => Self = self;
+
+  ~InternalAggregate() {
+    ReleaseUnmanagedResources();
+  }
+
+  public void Dispose() {
+    ReleaseUnmanagedResources();
+    GC.SuppressFinalize(this);
+  }
+
+  private void ReleaseUnmanagedResources() {
+    if (!Self.TryRelease(out var old)) {
+      return;
+    }
+    NativeAggregate.deephaven_client_Aggregate_dtor(old);
+  }
+}
+
+internal partial class NativeAggregate {
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_dtor(NativePtr<NativeAggregate> self);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_AbsSum(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Group(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Avg(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Count(
+    string column, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_First(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Last(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Max(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Med(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Min(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Pct(
+    double percentile, InteropBool avgMedian,
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Std(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Sum(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_Var(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+  [LibraryImport(LibraryPaths.Dhclient, StringMarshalling = StringMarshalling.Utf8)]
+  public static partial void deephaven_client_Aggregate_WAvg(
+    string[] columns, Int32 numColumns, out NativePtr<NativeAggregate> result, out ErrorStatus status);
+}