Function getGlobalASTFuzzer

src/Interpreters/executeQuery.cpp:1999–2011

std::pair<std::shared_ptr<QueryFuzzer>, std::unique_lock<std::mutex>> getGlobalASTFuzzer()
{
    static std::mutex mutex;
#if WITH_COVERAGE
    /// Under LLVM coverage builds we use a fixed seed so that the set of AST mutations
    /// (and therefore the set of branches taken inside `QueryFuzzer`) is stable run-to-run.
    /// Without this, coverage of `QueryFuzzer.cpp` and friends flickers between coverage runs.
    static std::shared_ptr<QueryFuzzer> fuzzer = std::make_shared<QueryFuzzer>(pcg64(0xC0FFEEULL));
#else
    static std::shared_ptr<QueryFuzzer> fuzzer = std::make_shared<QueryFuzzer>(randomSeed());
#endif
    return {fuzzer, std::unique_lock(mutex)};
}


static bool isReadOnlyQuery(const ASTPtr & ast)