[LucaCappelletti94]

SELECT interval '1' week parses as a one-week interval under PostgreSqlDialect, but PostgreSQL (VERY COUNTERINTUITIVELY) returns one second in a column named week. Its grammar (opt_interval in gram.y) takes only YEAR, MONTH, DAY, HOUR, MINUTE and SECOND and their TO ranges as an interval qualifier, so any other word after the value is a column alias. The same holds for decade, quarter, epoch and plural spellings such as days.

The words that can start a qualifier move from Parser::next_token_is_temporal_unit into a new Dialect::is_interval_qualifier, with the existing list as the default and PostgreSQL's six fields as its override. Other dialects parse as before.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.59%. Comparing base (e7c4410) to head (2fa1622).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2775   +/-   ##
=======================================
  Coverage   82.59%   82.59%           
=======================================
  Files          42       42           
  Lines       35575    35582    +7     
  Branches    35575    35582    +7     
=======================================
+ Hits        29382    29389    +7     
  Misses       2659     2659           
  Partials     3534     3534           

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[LucaCappelletti94]

Thanks @sabir-akhadov-localstack for the review, I will merging this now.

cc @alamb