feat: remove check hook of polar_px_scan_unit_size

Author: mrdrivingduck

src/backend/utils/misc/guc_px.c

@@ -2491,7 +2491,7 @@ struct config_int ConfigureNamesInt_px[] =
 		},
 		&px_scan_unit_size,
 		512, 1, 1024,
-		px_check_scan_unit_size, NULL, px_show_scan_unit_size
+		px_check_scan_unit_size, NULL, NULL
 	},
 
 	{
@@ -2783,15 +2783,6 @@ px_check_scan_unit_size(int *newval, void **extra, GucSource source)
 	return true;
 }
 
-static const char*
-px_show_scan_unit_size(void)
-{
-	static char nbuf[120];
-	snprintf(nbuf, sizeof(nbuf), "scan_unit_size: %d, scan_unit_bit: %d",
-		px_scan_unit_size, px_scan_unit_bit);
-	return nbuf;
-}
-
 static bool
 px_check_ignore_function(char **newval, void **extra, GucSource source)
 {