Fix: GUIDs not being stored as Guids (#461)

* Fixing issue where Guids weren't being stored in the service buffer file as Guids

* Removing unnecessary ReadSqlGuid method

* Adding unit test for revert cell integration

* Adding unit test for edit session initialization

* Revert "Adding unit test for revert cell integration"

This reverts commit a949926f2ebbb0c39f776edba76d999af4f3f3e9.

* Revert "Adding unit test for edit session initialization"

This reverts commit ff9e5a7d0e5392b27257e57db64879699d73d21c.

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/ServiceBufferFileStreamReader.cs

@@ -81,6 +81,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 {typeof(DateTimeOffset), (o, id, col) => ReadDateTimeOffset(o, id)},
                 {typeof(TimeSpan),       (o, id, col) => ReadTimeSpan(o, id)},
                 {typeof(byte[]),         (o, id, col) => ReadBytes(o, id)},
+                {typeof(Guid),           (o, id, col) => ReadGuid(o, id)},
 
                 {typeof(SqlString),      (o, id, col) => ReadString(o, id)},
                 {typeof(SqlInt16),       (o, id, col) => ReadInt16(o, id)},
@@ -467,14 +468,14 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
         /// </summary>
         /// <param name="offset">Offset into the file to read the bytes from</param>
         /// <param name="rowId">Internal ID of the row that will be stored in the cell</param>
-        /// <returns>A guid type object</returns>
+        /// <returns>A system guid type object</returns>
         internal FileStreamReadResult ReadGuid(long offset, long rowId)
         {
             return ReadCellHelper(offset, rowId, length =>
             {
                 byte[] output = new byte[length];
                 Buffer.BlockCopy(buffer, 0, output, 0, length);
-                return new SqlGuid(output);
+                return new Guid(output);
             }, totalLength => totalLength == 1);
         }
 

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/ServiceBufferFileStreamWriter.cs

@@ -90,6 +90,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 {typeof(DateTimeOffset), val => WriteDateTimeOffset((DateTimeOffset) val) },
                 {typeof(TimeSpan), val => WriteTimeSpan((TimeSpan) val) },
                 {typeof(byte[]), val => WriteBytes((byte[]) val)},
+                {typeof(Guid), val => WriteGuid((Guid) val)},
 
                 {typeof(SqlString), val => WriteNullable((SqlString) val, obj => WriteString((string) obj))},
                 {typeof(SqlInt16), val => WriteNullable((SqlInt16) val, obj => WriteInt16((short) obj))},

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/ServiceBufferFileStreamReaderWriterTests.cs

@@ -19,7 +19,7 @@ using Xunit;
 
 namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
 {
-    public class ReaderWriterPairTest
+    public class ServiceBufferReaderWriterTests
     {
         [Fact]
         public void ReaderStreamNull()
@@ -535,23 +535,25 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
                 (reader, rowId) => reader.ReadBytes(0, rowId));
         }
 
-        [Fact]
-        public void GuidTest()
+        public static IEnumerable<object[]> GuidTestParameters
         {
-            // Setup:
-            // ... Create some test values
-            // NOTE: We are doing these here instead of InlineData because Guid type can't be written as constant expressions
-            Guid[] guids =
+            get
             {
-                Guid.Empty, Guid.NewGuid(), Guid.NewGuid()
-            };
-            foreach (Guid guid in guids)
-            {
-                VerifyReadWrite(guid.ToByteArray().Length + 1, new SqlGuid(guid), (writer, val) => writer.WriteGuid(guid),
-                    (reader, rowId) => reader.ReadGuid(0, rowId));
+                yield return new object[] {Guid.Empty};
+                yield return new object[] {Guid.NewGuid()};
+                yield return new object[] {Guid.NewGuid()};
             }
         }
 
+        [Theory]
+        [MemberData(nameof(GuidTestParameters))]
+        public void GuidTest(Guid testValue)
+        {
+            VerifyReadWrite(testValue.ToByteArray().Length + 1, testValue,
+                (writer, val) => writer.WriteGuid(testValue),
+                (reader, rowId) => reader.ReadGuid(0, rowId));
+        }
+
         [Fact]
         public void MoneyTest()
         {