Quick and dirty fix for S2

Those changes are workaround for issues when using this client on
SingleStore.
It is not meant to be production grade changes yet, but allows us to
continue testing our solution against S2.

src/MySqlConnector/Core/ServerSession.cs

@@ -316,7 +316,7 @@ public void FinishQuerying()
 			// In order to handle this case, we issue a dummy query that will consume the pending cancellation.
 			// See https://bugs.mysql.com/bug.php?id=45679
 			Log.Debug("Session{0} sending 'DO SLEEP(0)' command to clear pending cancellation", m_logArguments);
-			var payload = QueryPayload.Create(SupportsQueryAttributes, "DO SLEEP(0);");
+			var payload = QueryPayload.Create(SupportsQueryAttributes, "SELECT SLEEP(0) INTO @dummy;");
 #pragma warning disable CA2012 // Safe because method completes synchronously
 			SendAsync(payload, IOBehavior.Synchronous, CancellationToken.None).GetAwaiter().GetResult();
 			payload = ReceiveReplyAsync(IOBehavior.Synchronous, CancellationToken.None).GetAwaiter().GetResult();
@@ -1200,7 +1200,7 @@ private async Task<bool> OpenNamedPipeAsync(ConnectionSettings cs, int startTick
 						await namedPipeStream.ConnectAsync(timeout, cancellationToken).ConfigureAwait(false);
 					else
 #endif
-						namedPipeStream.Connect(timeout);
+					namedPipeStream.Connect(timeout);
 				}
 				catch (Exception ex) when ((ex is ObjectDisposedException && cancellationToken.IsCancellationRequested) || ex is TimeoutException)
 				{

src/MySqlConnector/MySqlParameter.cs

@@ -288,7 +288,7 @@ internal void AppendSqlString(ByteBufferWriter writer, StatementPreparerOptions
 			var length = inputSpan.Length + BinaryBytes.Length + 1;
 			foreach (var by in inputSpan)
 			{
-				if (by is 0x27 || by is 0x5C && !noBackslashEscapes)
+				if (by is 0x27 || by is 0x5C && !noBackslashEscapes || by is 0x00)
 					length++;
 			}
 
@@ -297,9 +297,17 @@ internal void AppendSqlString(ByteBufferWriter writer, StatementPreparerOptions
 			var index = BinaryBytes.Length;
 			foreach (var by in inputSpan)
 			{
-				if (by is 0x27 || by is 0x5C && !noBackslashEscapes)
+				if (by is 0x00)
+				{
+					outputSpan[index++] = (byte) '\\';
+					outputSpan[index++] = (byte) '0';
+				}
+				else
+				{
+					if (by is 0x27 || by is 0x5C && !noBackslashEscapes)
+						outputSpan[index++] = by;
 					outputSpan[index++] = by;
-				outputSpan[index++] = by;
+				}
 			}
 			outputSpan[index++] = 0x27;
 			Debug.Assert(index == length, "index == length");
@@ -394,9 +402,17 @@ internal void AppendSqlString(ByteBufferWriter writer, StatementPreparerOptions
 				writer.Write(BinaryBytes);
 				foreach (var by in bytes)
 				{
-					if (by is 0x27 or 0x5C)
-						writer.Write((byte) 0x5C);
-					writer.Write(by);
+					if (by is 0x00)
+					{
+						writer.Write((byte) '\\');
+						writer.Write((byte) '0');
+					}
+					else
+					{
+						if (by is 0x27 or 0x5C)
+							writer.Write((byte) 0x5C);
+						writer.Write(by);
+					}
 				}
 				writer.Write((byte) '\'');
 			}