Undo "Replace custom array parser by pqxx::array_parser" #277
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Fixes #276
Reverts #261
libpqxx seems to treat semicolons as a separator character regardless of the actual field type (Postgresql docs mention that only box type uses semicolon, all other standard types use comma only).
As our payload in varchar fields may contain semicolons, the array_agg() result would throw off the libpqxx array parser.
So for now we revert to the previous custom parser implementation.
Further upstream issue analysis to follow.