IMHO having an SQL language server they does only parsing, ie. validates only syntax, is a bit like a Java language server that does parsing only — ie. does not

IMHO having an SQL language server they does only parsing, ie. validates only syntax, is a bit like a Java language server that does parsing only — ie. does not check whether e.g. a given variable/method actually exists or whether types match. The schema is so integral to SQL — since it defines precisely the valid names and types — that a language server that isn't aware of this is of limited use in practice.