58e4c2697f
* feat: Reimplement keywords as BTreeSet for more efficient lookup
Added a `Token` type to perform case-insensitive comparisons to avoid
allocations when performing lookups in the set.
Also introduced new `keyword` combinator to replace use of
`tag_no_case`. This is necessary to prevent eagerly recognising tags
without the appropriate separator. For example, `tag_no_case("OR")`
will recognise `ORDER` in a conditional expression.
The new combinator a `keyword` follows the pattern:
```
keyword ::= (a..z | A..Z)* keyword_separator
keyword_separator ::= ' ' | '(' | ')' | ';' | ',' | '=' |
'\n' | '\t'
```
* fix: Allow quoted time; using more efficient case-insensitive comparison
* fix: Digits to right of decimal point are optional
* fix: More idiomatic use of zip
* fix: Use `keyword` combinator and adjust whitespace handling
* fix: <> is a valid alias for the != operator
* fix: Special handling of DISTINCT identifier for function call name
* chore: Add tests
* chore: Feedback to remove unnecessary comments
* chore: Switch from BTreeSet to HashSet – thanks @domodwyer!
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