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, 19 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/interface/constants.h b/yt/cpp/mapreduce/interface/constants.h
new file mode 100644
index 00000000000..4f704108146
--- /dev/null
+++ b/yt/cpp/mapreduce/interface/constants.h
@@ -0,0 +1,19 @@
+#pragma once
+
+
+#include <util/system/defaults.h>
+
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+// Maximum number of input tables for operation.
+// If greater number of input tables are provided behaviour is undefined
+// (it might work ok or it might fail or it might work very slowly).
+constexpr size_t MaxInputTableCount = 1000;
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT