sort: add retry logic on file-descriptor exhaustion #7197
+168
−98
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Partial fix for bug #5714
Rework the merging logic to continue if we error-out due to file descriptor exhaustion. Merging will only stop if no progress can be made.
Also minor tweek to code handling output-is-an-input scenario to prevent a double-open of the generated temp-file.
Updated appropriate test case.