Re: XID formatting and SLRU refactorings (was: Add 64-bit XIDs into PostgreSQL 15)

Hi again,

> PFA the corrected patchset v59.

On second thought, I believe this Assert is incorrect:

```
+    else
+    {
+        Assert(segno >= 0 && segno <= 0xFFFF);
+        return snprintf(path, MAXPGPATH, "%s/%04X", (ctl)->Dir,
+                        (unsigned int) segno);
+    }
```

See SlruCorrectSegmentFilenameLength():

```
    if (ctl->long_segment_names)
        return (len == 15); /* see SlruFileName() */
    else
        /*
         * Commit 638cf09e76d allowed 5-character lengths. Later commit
         * 73c986adde5 allowed 6-character length.
         *
         * XXX should we still consider such names to be valid?
         */
        return (len == 4 || len == 5 || len == 6);
```

Should we just drop it or check that segno is <= 0xFFFFFF?

-- 
Best regards,
Aleksander Alekseev