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由 Tom Lane 提交于
The new message (and SQLSTATE) matches the corresponding error cases in namespace.c. This was thought to be a "can't happen" case when extension.c was written, so we didn't think hard about how to report it. But it definitely can happen in 9.2 and later, since we no longer require search_path to contain any valid schema names. It's probably also possible in 9.1 if search_path came from a noninteractive source. So, back-patch to all releases containing this code. Per report from Sean Chittenden, though this isn't exactly his patch.
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