Changes: * Make epgsql commands pluggable (see [pluggable_commands.md](pluggable_commands.md)). Now we are not limited only by API functions provided by epgsql (equery/squery/prepared_query etc), but may create own commands as a plugins. Still, understanding of PostgreSQL network protocol needed to be able to do so. * Make epgsql datatype encoding/decdoding pluggable (see [pluggable_types.md](pluggable_types.md)). Now we are able to add or tweak codecs for existing as well as custom PostgreSQL datatypes (like datetime, varchar, enum, arrays etc). XXX: Highly recommend to add `{codecs, []}` option to your `epgsql:connect/X` calls if you don't use PostGIS and hstore datatypes: this will reduce connection setup time. * epgsql internals had a huge refactoring (4,000 additions and 1,750 deletions for ~5500 LOC project). Code now is much more modular, documented and have a lot of internal typespecs. Performance improvements are also expected. * Now we try to use iolists as much as possible and avoid binary and string concatenations when ever possible. Expect noticeable performance improvements for large BYTEA / TEXT / VARCHAR / JSON / JSONB etc fields. * Extended and documented `epgsql:with_transaction/3`. Now it's possible to preserve original exception's stacktrace, finally! * macaddr and macaddr8 datatypes support added * Float datatype support was extended with `nan`, `minus_infinity`, `plus_infinity` * elvis code style check was added to our travis pipeline * Brand-new PostgreSQL 10 scram-sha-256 auth method added (see https://www.postgresql.org/docs/10/static/auth-methods.html#AUTH-PASSWORD and https://www.postgresql.org/docs/current/static/sasl-authentication.html) * A lot of typespecs were rewritten and lots of internal typespecs were added Incompatibilities: * Some unexpected performance issues may appear, but we expect performance improvements, especially for a large result sets (when a lot of rows are returned by a query) and for large string/json/blob query parameters * Undocumented `epgsql:update_type_cache/2` API was changed * A lot of typespecs were updated. Some typespecs were deprecated or moved from epgsql.erl to other modules. So, some new dialyzer warnings might pop-up * Some new error messages might be returned, especially from epgsql:connect/X functions * Memory consumption per-connection might slightly grow because we maintain per-connection OID<->codec mapping table, which might be quite big in some cases. This also may produce bigger error_logger reports in case of epgsql connection process crashes. * Some exported .hrl files have been changed. `#column{}` and `#statement{}` record definitions were extended. * PostGIS users might be affected by cleanup of ewkb.erl and epgsql_geometry.hrl * Streaming replication users should pay extra attention. No tests were broken, but a lot of modifications were made to this code. * Passing integer / atom / float as a value of a text / varchar / bytea query parameter is now deprecated (so, `epgsql:equery(C, "SELECT $1::text", [my_atom])` will still work but is not recommended) * Redshift and CockroachDB users might expirience some problems. Please, report bugs!
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