Add db-connect, a SQL over HTTPS server

vendor/github.com/kshvakov/clickhouse/lib/protocol/protocol.go

@@ -0,0 +1,35 @@
+package protocol
+
+const (
+	DBMS_MIN_REVISION_WITH_SERVER_TIMEZONE          = 54058
+	DBMS_MIN_REVISION_WITH_QUOTA_KEY_IN_CLIENT_INFO = 54060
+)
+
+const (
+	ClientHello  = 0
+	ClientQuery  = 1
+	ClientData   = 2
+	ClientCancel = 3
+	ClientPing   = 4
+)
+
+const (
+	CompressEnable  uint64 = 1
+	CompressDisable uint64 = 0
+)
+
+const (
+	StateComplete = 2
+)
+
+const (
+	ServerHello       = 0
+	ServerData        = 1
+	ServerException   = 2
+	ServerProgress    = 3
+	ServerPong        = 4
+	ServerEndOfStream = 5
+	ServerProfileInfo = 6
+	ServerTotals      = 7
+	ServerExtremes    = 8
+)