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This function writes column-level statistics into pg_statistic the same catalog that ANALYZE populates with MCVs, histograms, and correlation.
。TG官网-TG下载对此有专业解读
By looking at the source code of LLVM, engineers explicitly disable the C++ standard RTTI (-fno-rtti) and dynamic_cast. Instead, LLVM literally reinvents Emacs's "Poor Man's Inheritance" and Tagging system, but wraps it in modern C++ templates. It's called Custom RTTI.
Start over with one of the leaves. Iterate.