From: Ben Pfaff <blp@cs.stanford.edu>
Date: Sun, 5 Mar 2023 19:04:29 +0000 (-0800)
Subject: case-map: Optimize case_map_create_output_translator() for no-op case.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=386de605e587854f3640b3998b5cc621f263272a;p=pspp

case-map: Optimize case_map_create_output_translator() for no-op case.
---

diff --git a/src/data/case-map.c b/src/data/case-map.c
index 214abaf844..c80a6679e3 100644
--- a/src/data/case-map.c
+++ b/src/data/case-map.c
@@ -154,11 +154,13 @@ struct casewriter *
 case_map_create_output_translator (struct case_map *map,
                                    struct casewriter *subwriter)
 {
-    return casewriter_create_translator (subwriter,
-                                         case_map_get_proto (map),
-                                         translate_case,
-                                         destroy_case_map,
-                                         map);
+  if (!map)
+    return casewriter_rename (subwriter);
+  return casewriter_create_translator (subwriter,
+                                       case_map_get_proto (map),
+                                       translate_case,
+                                       destroy_case_map,
+                                       map);
 }
 
 /* Casereader/casewriter translation callback. */