YT-19210: expose YQL shared library for YT.

After this, a new target libyqlplugin.so appears. in open-source cmake build.
Diff in open-source YDB repo looks like the following: https://paste.yandex-team.ru/f302bdb4-7ef2-4362-91c7-6ca45f329264

1 files changed, 120 insertions, 0 deletions

diff --git a/yt/yql/plugin/bridge/plugin.cpp b/yt/yql/plugin/bridge/plugin.cpp
new file mode 100644
index 00000000000..52b9f92a01f
--- /dev/null
+++ b/yt/yql/plugin/bridge/plugin.cpp
@@ -0,0 +1,120 @@
+#include "plugin.h"
+
+#include "interface.h"
+
+#include <yt/yql/plugin/plugin.h>
+#include <util/system/dynlib.h>
+
+#include <vector>
+#include <optional>
+
+namespace NYT::NYqlPlugin {
+namespace NBridge {
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TDynamicYqlPlugin
+{
+public:
+    TDynamicYqlPlugin(std::optional<TString> yqlPluginSharedLibrary)
+    {
+        const TString DefaultYqlPluginLibraryName = "./libyqlplugin.so";
+        auto sharedLibraryPath = yqlPluginSharedLibrary.value_or(DefaultYqlPluginLibraryName);
+        Library_.Open(sharedLibraryPath.data());
+        #define XX(function) function = reinterpret_cast<TFunc ## function*>(Library_.Sym(#function));
+        FOR_EACH_BRIDGE_INTERFACE_FUNCTION(XX);
+        #undef XX
+    }
+
+protected:
+    #define XX(function) TFunc ## function* function;
+    FOR_EACH_BRIDGE_INTERFACE_FUNCTION(XX)
+    #undef XX
+
+    TDynamicLibrary Library_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TYqlPlugin
+    : public TDynamicYqlPlugin
+    , public IYqlPlugin
+{
+public:
+    explicit TYqlPlugin(TYqlPluginOptions& options)
+        : TDynamicYqlPlugin(options.YqlPluginSharedLibrary)
+    {
+        std::vector<TBridgeYqlPluginOptions::TBridgeCluster> bridgeClusters;
+        for (const auto& [cluster, proxy]: options.Clusters) {
+            bridgeClusters.push_back({
+               .Cluster = cluster.data(),
+               .Proxy = proxy.data(),
+           });
+        }
+
+        const char* operationAttributes = options.OperationAttributes
+            ? options.OperationAttributes.ToString().data()
+            : nullptr;
+
+        const char* defaultCluster = options.DefaultCluster
+            ? options.DefaultCluster->data()
+            : nullptr;
+
+        TBridgeYqlPluginOptions bridgeOptions {
+            .MRJobBinary = options.MRJobBinary.data(),
+            .UdfDirectory = options.UdfDirectory.data(),
+            .ClusterCount = static_cast<int>(bridgeClusters.size()),
+            .Clusters = bridgeClusters.data(),
+            .DefaultCluster = defaultCluster,
+            .OperationAttributes = operationAttributes,
+            .YTTokenPath = options.YTTokenPath.data(),
+            .LogBackend = &options.LogBackend,
+        };
+
+        BridgePlugin_ = BridgeCreateYqlPlugin(&bridgeOptions);
+    }
+
+    TQueryResult Run(TString impersonationUser, TString queryText, NYson::TYsonString settings) noexcept override
+    {
+        const char* settingsData = settings ? settings.ToString().data() : nullptr;
+        auto* bridgeQueryResult = BridgeRun(BridgePlugin_, impersonationUser.data(), queryText.data(), settingsData);
+        auto toString = [] (const char* str, size_t strLength) -> std::optional<TString> {
+            if (!str) {
+                return std::nullopt;
+            }
+            return TString(str, strLength);
+        };
+        TQueryResult queryResult = {
+            .YsonResult = toString(bridgeQueryResult->YsonResult, bridgeQueryResult->YsonResultLength),
+            .Plan = toString(bridgeQueryResult->Plan, bridgeQueryResult->PlanLength),
+            .Statistics = toString(bridgeQueryResult->Statistics, bridgeQueryResult->StatisticsLength),
+            .TaskInfo = toString(bridgeQueryResult->TaskInfo, bridgeQueryResult->TaskInfoLength),
+            .YsonError = toString(bridgeQueryResult->YsonError, bridgeQueryResult->YsonErrorLength),
+        };
+        BridgeFreeQueryResult(bridgeQueryResult);
+        return queryResult;
+    }
+
+    ~TYqlPlugin() override
+    {
+        BridgeFreeYqlPlugin(BridgePlugin_);
+    }
+
+private:
+    TBridgeYqlPlugin* BridgePlugin_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NBridge
+
+////////////////////////////////////////////////////////////////////////////////
+
+std::unique_ptr<IYqlPlugin> CreateYqlPlugin(TYqlPluginOptions& options) noexcept
+{
+    return std::make_unique<NBridge::TYqlPlugin>(options);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT::NYqlPlugin::NBridge