From 97602456e32487d5fe5f7ecff3a0fddee8882d87 Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@cryptonector.com>
Date: Tue, 13 Jan 2015 18:57:35 -0600
Subject: join/1: respect empty strings (fix #668)

---
 builtin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'builtin.c')

diff --git a/builtin.c b/builtin.c
index 3a7a89c7..a9c64d8e 100644
--- a/builtin.c
+++ b/builtin.c
@@ -1065,7 +1065,7 @@ static const char* const jq_builtins[] = {
   "def scalars: select(. == null or . == true or . == false or type == \"number\" or type == \"string\");",
   "def scalars_or_empty: select(. == null or . == true or . == false or type == \"number\" or type == \"string\" or ((type==\"array\" or type==\"object\") and length==0));",
   "def leaf_paths: paths(scalars);",
-  "def join($x): reduce .[] as $i (\"\"; . + (if . == \"\" then $i else $x + $i end));",
+  "def join($x): reduce .[] as $i (null; (.//\"\") + (if . == null then $i else $x + $i end));",
   "def flatten: reduce .[] as $i ([]; if $i | type == \"array\" then . + ($i | flatten) else . + [$i] end);",
   "def flatten($x): reduce .[] as $i ([]; if $i | type == \"array\" and $x > 0 then . + ($i | flatten($x-1)) else . + [$i] end);",
   "def range($x): range(0;$x);",
-- 
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