f906e0786e
The previous coding just terminated the COPY immediately after seeing the EOF marker (-1 where a row field count is expected). The expected CopyDone or CopyFail message just got thrown away later, since we weren't in COPY mode anymore. This behavior complicated matters for the JDBC driver, and arguably was the wrong thing in any case since a CopyFail message after the marker wouldn't be honored. Note that there is a behavioral change here: extra data after the EOF marker was silently ignored before, but now it will cause an error. Hence not back-patching, although this is arguably a bug. Per report and patch by Kris Jurka.
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