Backport to 2.10.x: #5410: Fix file trailer handling in the copy fetcher #5423
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This is an automated backport of #5410: Fix file trailer handling in the copy fetcher.
The original issue is #5323.
This PR will be merged automatically after all the relevant CI checks pass. If this fix should not be backported, or will be backported manually, just close this PR. You can use the backport branch to add your changes, it won't be modified automatically anymore.
For more details, please see the documentation
Original description
Fix file trailer handling in the copy fetcher
The copy fetcher fetches tuples in batches. When the last element in the batch is the file trailer, the trailer was not handled correctly. The existing logic did not perform a PQgetCopyData in that case. Therefore the state of the fetcher was not set to EOF and the copy operation was not correctly finished at this point.
Fixes: #5323, #5394