Hayden 40c911597b
refactor: improve keywords definations (#100)
* feat: improve keywords definations and add prefix named KW_

* test: capitalize keywords in alter sql test cases

* test: capitalize keywords in create sql test cases

* feat: merge interval rule and timeIntervalExpression rule in flinksql grammar

* test: put keywords in quotation marks around insert sql test cases

* test: put keywords in quotation marks around select sql test cases

* feat: improve uid rule

* test: rename sum to _sum because it is a reserved keyword

* docs: improve comments in flinkSqlLexer
2023-05-19 14:28:25 +08:00
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