fix(completions): replace error node handling with better grammar #616
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The error node handling was necessary because the grammar was too rigid for our purposes.
For completions/hover, it makes sense to have a heavily "left-balanced" grammar—whenever a statement type is recognizable by its one, two, three etc. first tokens, it should be recognized as that statement type.
Example:
alter table auth.users |should be recognized as an alter table statement, it shouldn't require a trailingalter column …ordrop column …and so on.