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Several functions in the codebase accept "Datum *" parameters but do not modify the pointed-to data. These have been updated to take "const Datum *" instead, improving type safety and making the interfaces clearer about their intent. This change helps the compiler catch accidental modifications and better documents immutability of arguments. Most of "Datum *" parameters have a pairing "bool *isnull" parameter, they are constified as well. No functional behavior is changed by this patch. Author: Chao Li <lic@highgo.com> Discussion: https://www.postgresql.org/message-id/flat/CAEoWx2msfT0knvzUa72ZBwu9LR_RLY4on85w2a9YpE-o2By5HQ@mail.gmail.com