From 86b0d09165842f5ccd6473956387cfebb7a5353e Mon Sep 17 00:00:00 2001
From: Arthur Peters <amp@katanagraph.com>
Date: Sun, 25 Apr 2021 17:41:14 -0500
Subject: [PATCH] tsuba: Include the property names in the error if not unique.

---
 libtsuba/src/RDGCore.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libtsuba/src/RDGCore.cpp b/libtsuba/src/RDGCore.cpp
index 5562b30c2e..8d329207f0 100644
--- a/libtsuba/src/RDGCore.cpp
+++ b/libtsuba/src/RDGCore.cpp
@@ -57,7 +57,8 @@ UpsertProperties(
 
   if (!next->schema()->HasDistinctFieldNames()) {
     return KATANA_ERROR(
-        tsuba::ErrorCode::Exists, "column names are not distinct");
+        tsuba::ErrorCode::Exists, "column names are not distinct: {}",
+        fmt::join(next->schema()->field_names(), ", "));
   }
 
   *to_update = next;