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Previously, `QueryJobInfo` was composed of two parts: a `QueryInfo` and a `QueryJob`. However, both `QueryInfo` and `QueryJob` have a `span` field, which seem to be the same. So, the `span` was recorded twice. Now, `QueryJobInfo` is composed of a `QueryStackFrame` (the other field of `QueryInfo`) and a `QueryJob`. So, now, the `span` is only recorded once.