ClickHouse · rschu1ze · Mar 31, 2023 · Mar 15, 2023 · Mar 15, 2023 · Mar 29, 2023
diff --git a/docs/en/development/build-cross-osx.md b/docs/en/development/build-cross-osx.md
@@ -11,14 +11,14 @@ This is intended for continuous integration checks that run on Linux servers. If
 
 The cross-build for macOS is based on the [Build instructions](../development/build.md), follow them first.
 
-## Install Clang-14
+## Install Clang-15
 
 Follow the instructions from https://apt.llvm.org/ for your Ubuntu or Debian setup.
 For example the commands for Bionic are like:
 
 ``` bash
-sudo echo "deb [trusted=yes] http://apt.llvm.org/bionic/ llvm-toolchain-bionic-14 main" >> /etc/apt/sources.list
-sudo apt-get install clang-14
+sudo echo "deb [trusted=yes] http://apt.llvm.org/bionic/ llvm-toolchain-bionic-15 main" >> /etc/apt/sources.list
+sudo apt-get install clang-15
 ```
 
 ## Install Cross-Compilation Toolset {#install-cross-compilation-toolset}
@@ -55,7 +55,7 @@ curl -L 'https://github.com/phracker/MacOSX-SDKs/releases/download/10.15/MacOSX1
 cd ClickHouse
 mkdir build-darwin
 cd build-darwin
-CC=clang-14 CXX=clang++-14 cmake -DCMAKE_AR:FILEPATH=${CCTOOLS}/bin/x86_64-apple-darwin-ar -DCMAKE_INSTALL_NAME_TOOL=${CCTOOLS}/bin/x86_64-apple-darwin-install_name_tool -DCMAKE_RANLIB:FILEPATH=${CCTOOLS}/bin/x86_64-apple-darwin-ranlib -DLINKER_NAME=${CCTOOLS}/bin/x86_64-apple-darwin-ld -DCMAKE_TOOLCHAIN_FILE=cmake/darwin/toolchain-x86_64.cmake ..
+CC=clang-15 CXX=clang++-15 cmake -DCMAKE_AR:FILEPATH=${CCTOOLS}/bin/x86_64-apple-darwin-ar -DCMAKE_INSTALL_NAME_TOOL=${CCTOOLS}/bin/x86_64-apple-darwin-install_name_tool -DCMAKE_RANLIB:FILEPATH=${CCTOOLS}/bin/x86_64-apple-darwin-ranlib -DLINKER_NAME=${CCTOOLS}/bin/x86_64-apple-darwin-ld -DCMAKE_TOOLCHAIN_FILE=cmake/darwin/toolchain-x86_64.cmake ..
 ninja
 ```
 

diff --git a/src/IO/Progress.cpp b/src/IO/Progress.cpp
@@ -28,13 +28,13 @@ void ProgressValues::read(ReadBuffer & in, UInt64 server_revision)
 
 void ProgressValues::write(WriteBuffer & out, UInt64 client_revision) const
 {
-    writeVarUInt(read_rows, out);
-    writeVarUInt(read_bytes, out);
-    writeVarUInt(total_rows_to_read, out);
+    writeVarUIntOverflow(read_rows, out);
+    writeVarUIntOverflow(read_bytes, out);
+    writeVarUIntOverflow(total_rows_to_read, out);
     if (client_revision >= DBMS_MIN_REVISION_WITH_CLIENT_WRITE_INFO)
     {
-        writeVarUInt(written_rows, out);
-        writeVarUInt(written_bytes, out);
+        writeVarUIntOverflow(written_rows, out);
+        writeVarUIntOverflow(written_bytes, out);
     }
     if (client_revision >= DBMS_MIN_PROTOCOL_VERSION_WITH_SERVER_QUERY_TIME_IN_PROGRESS)
     {

diff --git a/src/IO/VarInt.h b/src/IO/VarInt.h
@@ -2,6 +2,7 @@
 
 #include <iostream>
 #include <base/types.h>
+#include <base/defines.h>
 #include <IO/ReadBuffer.h>
 #include <IO/WriteBuffer.h>
 
@@ -14,12 +15,32 @@ namespace ErrorCodes
 }
 
 
-/** Write UInt64 in variable length format (base128) NOTE Only up to 2^63 - 1 are supported. */
+/** Variable-Length Quantity (VLQ) Base-128 compression
+ *
+ * NOTE: Due to historical reasons, only up to 1<<63-1 are supported, which
+ * cannot be changed without breaking the backward compatibility.
+ * Also some drivers may support full 1<<64 range (i.e. python -
+ * clickhouse-driver), while others has the same limitations as ClickHouse
+ * (i.e. Rust - clickhouse-rs).
+ * So implementing VLQ for the whole 1<<64 range will require different set of
+ * helpers.
+ */
+constexpr UInt64 VAR_UINT_MAX = (1ULL<<63) - 1;
+
+/** Write UInt64 in variable length format (base128) */
 void writeVarUInt(UInt64 x, std::ostream & ostr);
 void writeVarUInt(UInt64 x, WriteBuffer & ostr);
 char * writeVarUInt(UInt64 x, char * ostr);
 
 
+/** Write UInt64 in variable length format, wrap the value to VAR_UINT_MAX if it exceed VAR_UINT_MAX (to bypass sanity check) */
+template <typename ...Args>
+auto writeVarUIntOverflow(UInt64 x, Args && ... args)
+{
+    return writeVarUInt(std::min(x, VAR_UINT_MAX), std::forward<Args>(args)...);
+}
+
+
 /** Read UInt64, written in variable length format (base128) */
 void readVarUInt(UInt64 & x, std::istream & istr);
 void readVarUInt(UInt64 & x, ReadBuffer & istr);
@@ -186,6 +207,7 @@ inline const char * readVarUInt(UInt64 & x, const char * istr, size_t size)
 
 inline void writeVarUInt(UInt64 x, WriteBuffer & ostr)
 {
+    chassert(x <= VAR_UINT_MAX);
     for (size_t i = 0; i < 9; ++i)
     {
         uint8_t byte = x & 0x7F;
@@ -205,6 +227,7 @@ inline void writeVarUInt(UInt64 x, WriteBuffer & ostr)
 
 inline void writeVarUInt(UInt64 x, std::ostream & ostr)
 {
+    chassert(x <= VAR_UINT_MAX);
     for (size_t i = 0; i < 9; ++i)
     {
         uint8_t byte = x & 0x7F;
@@ -222,6 +245,7 @@ inline void writeVarUInt(UInt64 x, std::ostream & ostr)
 
 inline char * writeVarUInt(UInt64 x, char * ostr)
 {
+    chassert(x <= VAR_UINT_MAX);
     for (size_t i = 0; i < 9; ++i)
     {
         uint8_t byte = x & 0x7F;

diff --git a/src/IO/examples/var_uint.cpp b/src/IO/examples/var_uint.cpp
@@ -18,26 +18,32 @@ int main(int argc, char ** argv)
     }
 
     DB::UInt64 x = DB::parse<UInt64>(argv[1]);
+
+    std::cout << std::hex << std::showbase << "Input: " << x << std::endl;
+
     Poco::HexBinaryEncoder hex(std::cout);
-    DB::writeVarUInt(x, hex);
+    std::cout << "writeVarUIntOverflow(std::ostream): 0x";
+    DB::writeVarUIntOverflow(x, hex);
     std::cout << std::endl;
 
     std::string s;
 
     {
         DB::WriteBufferFromString wb(s);
-        DB::writeVarUInt(x, wb);
+        DB::writeVarUIntOverflow(x, wb);
         wb.next();
     }
 
+    std::cout << "writeVarUIntOverflow(WriteBuffer): 0x";
     hex << s;
     std::cout << std::endl;
 
     s.clear();
     s.resize(9);
 
-    s.resize(DB::writeVarUInt(x, s.data()) - s.data());
+    s.resize(DB::writeVarUIntOverflow(x, s.data()) - s.data());
 
+    std::cout << "writeVarUIntOverflow(char *): 0x";
     hex << s;
     std::cout << std::endl;
 
@@ -46,7 +52,7 @@ int main(int argc, char ** argv)
     DB::ReadBufferFromString rb(s);
     DB::readVarUInt(y, rb);
 
-    std::cerr << "x: " << x << ", y: " << y << std::endl;
+    std::cerr << "Input: " << x << ", readVarUInt(writeVarUIntOverflow()): " << y << std::endl;
 
     return 0;
 }
diff --git a/src/Server/TCPHandler.cpp b/src/Server/TCPHandler.cpp
@@ -1895,7 +1895,7 @@ void TCPHandler::sendData(const Block & block)
         {
             --unknown_packet_in_send_data;
             if (unknown_packet_in_send_data == 0)
-                writeVarUInt(UInt64(-1), *out);
+                writeVarUInt(VAR_UINT_MAX, *out);
         }
 
         writeVarUInt(Protocol::Server::Data, *out);