libpqxx: cache column names #383
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From libpqxx docs: pqxx::field pqxx::row::at (const char f[]) const Warning: This is much slower than indexing by number, or iterating.
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From libpqxx docs:
Without caching, we're repeatedly calling PQfnumber for each row/field, which does a strcmp across all column names. Since our queries don't return a huge number of columns, this was not too bad before.