Replace DvBool with .NET standard type.

src/Microsoft.ML.Api/ApiUtils.cs

@@ -20,7 +20,7 @@ private static OpCode GetAssignmentOpCode(Type t)
             // REVIEW: This should be a Dictionary<Type, OpCode> based solution.
             // DvTypes, strings, arrays, all nullable types, VBuffers and UInt128.
             if (t == typeof(DvInt8) || t == typeof(DvInt4) || t == typeof(DvInt2) || t == typeof(DvInt1) ||
-                t == typeof(DvBool) || t == typeof(DvText) || t == typeof(string) || t.IsArray ||
+                t == typeof(DvText) || t == typeof(string) || t.IsArray ||
                 (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(VBuffer<>)) ||
                 (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)) ||
                 t == typeof(DvDateTime) || t == typeof(DvDateTimeZone) || t == typeof(DvTimeSpan) || t == typeof(UInt128))

src/Microsoft.ML.Api/DataViewConstructionUtils.cs

@@ -171,16 +171,6 @@ private Delegate CreateGetter(int index)
                             Ch.Assert(colType.ItemType == NumberType.I1);
                             return CreateConvertingArrayGetterDelegate<sbyte?, DvInt1>(index, x => x ?? DvInt1.NA);
                         }
-                        else if (outputType.GetElementType() == typeof(bool))
-                        {
-                            Ch.Assert(colType.ItemType.IsBool);
-                            return CreateConvertingArrayGetterDelegate<bool, DvBool>(index, x => x);
-                        }
-                        else if (outputType.GetElementType() == typeof(bool?))
-                        {
-                            Ch.Assert(colType.ItemType.IsBool);
-                            return CreateConvertingArrayGetterDelegate<bool?, DvBool>(index, x => x ?? DvBool.NA);
-                        }
 
                         // T[] -> VBuffer<T>
                         if (outputType.GetElementType().IsGenericType && outputType.GetElementType().GetGenericTypeDefinition() == typeof(Nullable<>))
@@ -208,18 +198,6 @@ private Delegate CreateGetter(int index)
                             Ch.Assert(colType.IsText);
                             return CreateConvertingGetterDelegate<String, DvText>(index, x => x == null ? DvText.NA : new DvText(x));
                         }
-                        else if (outputType == typeof(bool))
-                        {
-                            // Bool -> DvBool
-                            Ch.Assert(colType.IsBool);
-                            return CreateConvertingGetterDelegate<bool, DvBool>(index, x => x);
-                        }
-                        else if (outputType == typeof(bool?))
-                        {
-                            // Bool? -> DvBool
-                            Ch.Assert(colType.IsBool);
-                            return CreateConvertingGetterDelegate<bool?, DvBool>(index, x => x ?? DvBool.NA);
-                        }
                         else if (outputType == typeof(int))
                         {
                             // int -> DvInt4

src/Microsoft.ML.Api/TypedCursor.cs

@@ -282,16 +282,6 @@ private Action<TRow> GenerateSetter(IRow input, int index, InternalSchemaDefinit
                         Ch.Assert(colType.ItemType.IsText);
                         return CreateConvertingVBufferSetter<DvText, string>(input, index, poke, peek, x => x.ToString());
                     }
-                    else if (fieldType.GetElementType() == typeof(bool))
-                    {
-                        Ch.Assert(colType.ItemType.IsBool);
-                        return CreateConvertingVBufferSetter<DvBool, bool>(input, index, poke, peek, x => (bool)x);
-                    }
-                    else if (fieldType.GetElementType() == typeof(bool?))
-                    {
-                        Ch.Assert(colType.ItemType.IsBool);
-                        return CreateConvertingVBufferSetter<DvBool, bool?>(input, index, poke, peek, x => (bool?)x);
-                    }
                     else if (fieldType.GetElementType() == typeof(int))
                     {
                         Ch.Assert(colType.ItemType == NumberType.I4);
@@ -360,18 +350,6 @@ private Action<TRow> GenerateSetter(IRow input, int index, InternalSchemaDefinit
                         Ch.Assert(peek == null);
                         return CreateConvertingActionSetter<DvText, string>(input, index, poke, x => x.ToString());
                     }
-                    else if (fieldType == typeof(bool))
-                    {
-                        Ch.Assert(colType.IsBool);
-                        Ch.Assert(peek == null);
-                        return CreateConvertingActionSetter<DvBool, bool>(input, index, poke, x => (bool)x);
-                    }
-                    else if (fieldType == typeof(bool?))
-                    {
-                        Ch.Assert(colType.IsBool);
-                        Ch.Assert(peek == null);
-                        return CreateConvertingActionSetter<DvBool, bool?>(input, index, poke, x => (bool?)x);
-                    }
                     else if (fieldType == typeof(int))
                     {
                         Ch.Assert(colType == NumberType.I4);

src/Microsoft.ML.Core/Data/ColumnType.cs

@@ -573,7 +573,7 @@ public static BoolType Instance
         }
 
         private BoolType()
-            : base(typeof(DvBool), DataKind.BL)
+            : base(typeof(bool), DataKind.BL)
         {
         }
 

src/Microsoft.ML.Core/Data/DataKind.cs

@@ -163,7 +163,7 @@ public static Type ToType(this DataKind kind)
                 case DataKind.TX:
                     return typeof(DvText);
                 case DataKind.BL:
-                    return typeof(DvBool);
+                    return typeof(bool);
                 case DataKind.TS:
                     return typeof(DvTimeSpan);
                 case DataKind.DT:
@@ -207,7 +207,7 @@ public static bool TryGetDataKind(this Type type, out DataKind kind)
                 kind = DataKind.R8;
             else if (type == typeof(DvText))
                 kind = DataKind.TX;
-            else if (type == typeof(DvBool) || type == typeof(bool) || type == typeof(bool?))
+            else if (type == typeof(bool))
                 kind = DataKind.BL;
             else if (type == typeof(DvTimeSpan))
                 kind = DataKind.TS;