[LIQ] Add nulls first / nulls last to order by

Extend the `order by` clause with optional `nulls first` and `nulls
last` modifiers following standard SQL semantics. Each sort key can
independently specify where `nil` values should appear in the result. By
default, ascending sorts place nulls last and descending sorts place
nulls first. An explicit nulls first or nulls last overrides this
default. The `asc` keyword is also now accepted as an explicit
alternative to the default ascending direction. Documentation and tests
were updated accordingly.

Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
This commit is contained in:
Matouš Jan Fialka
2026-03-02 12:34:25 +01:00
parent 8f193dc402
commit ff6854f6ee
10 changed files with 314 additions and 40 deletions
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