sqlparser: Limit nesting of parenthesized exprs #845
Merged
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This addresses #767
as well as other situations where there's possibility of
indefinite nesting of SQL constructs. There may be other
non-parenthesized constructs that allow nesting, but this fix
doesn't address them for now.
I've also made a few lint fixes. sql.go is still in violation,
but that requires bigger work.