Sqlfluff

Changed

- Better exception handling for the simple parsing API (`sqlfluff.parse`)
which now raises an exception which holds all potential parsing issues
and prints nicely with more than one issue.
- Fix bug [1037](https://github.com/sqlfluff/sqlfluff/issues/1037), in which fix
logging had been sent to stdout when reading data from stdin.
- Add a little bit of fun on CLI exit 🎉!
- Disabled models in the dbt templater are now skipped entirely rather than
returning an untemplated file.
- Add a changelog check to SQLFluff continuous integration.
- Fix bug [1083](https://github.com/sqlfluff/sqlfluff/issues/1083), adding
support for BigQuery named function arguments, used with functions such as
[ST_GEOGFROMGEOJSON()](https://cloud.google.com/bigquery/docs/reference/standard-sql/geography_functions#st_geogfromgeojson)
- Update documentation links to sqlfluff-online.

Added

- Lint and fix parallelism using `--parallel` CLI argument
- Fix [1051](https://github.com/sqlfluff/sqlfluff/issues/1051), adding support
for bitwise operators `&`, `|`, `^`, `<<`, `>>`

- Bugfix release for an issue in `L016` introduced in `0.5.4`.
- Fix for `L016` issue where `DISTINCT` keywords were mangled during
fixing [1024](https://github.com/sqlfluff/sqlfluff/issues/1024).

- Bugfix release for an off-by-one error introduced in L016 as part of `0.5.4`.

Added

- Parsing of Postgres dollar quoted literals.
- Parsing of Postgres filter grammar.
- Parsing of "ALTER DEFAULT PRIVILEGES" Postgres statement.
- Parsing of Postgres non-explicit role granting and function execution.
- Early failing on fatal dbt templater fails.

Changed

- Big rewrite of the lexer, segments and position markers for simplicity
and to support future parallelism work.
- Fix to L036 which previously mangled whitespace.

Added

- [`L009`](https://docs.sqlfluff.com/en/stable/rules.html#sqlfluff.core.rules.Rule_L009) can now be enforced when `templater = dbt`.
- Parsing of `EXPLAIN`, `USE` statements.
- Parsing of `ALTER TABLE x RENAME TO y` syntax.
- Parsing of `ALTER SESSION` in snowflake.
- Parsing of numeric literals with exponents.
- Added rule codes to diff_cover output.

Changed

- Fix `templater = dbt` L009 bug [861](https://github.com/sqlfluff/sqlfluff/issues/861) where:
- `sqlfluff lint` would incorrectly always return `L009 | Files must end with a trailing newline.`
- `sqlfluff fix` would remove trailing newlines when `exclude_rules = L009`.
- Fix bug with BigQuery comparison operators.
- Fix recursion bug with L045.
- Fix tuple index bug with L016.
- Fix mange coalecse bug with L043.
- Fix Jinja templating error with _UnboundLocalError_.
- Improve array parsing.
- Simplify bracket parsing.
- Speed up L010 with caching capitalisation policy.
- Output of `sqlfluff dialects` is now sorted.
- Handle disabled `dbt` models.