From c155f654b4f755b4111bd9adb60559fe22526a10 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Sat, 7 Sep 2013 11:44:33 -0400
Subject: [PATCH] intarray:  return empty zero-dimensional array for an empty
 array

Previously a one-dimensional empty array was returned, but its text
representation matched a zero-dimensional array, and there is no way to
dump/reload a one-dimensional empty array.

BACKWARD INCOMPATIBILITY

Per report from elein
---
 contrib/intarray/_int_tool.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/contrib/intarray/_int_tool.c b/contrib/intarray/_int_tool.c
index 863557672e..fc462b2076 100644
--- a/contrib/intarray/_int_tool.c
+++ b/contrib/intarray/_int_tool.c
@@ -246,6 +246,13 @@ resize_intArrayType(ArrayType *a, int num)
 	int			nbytes = ARR_DATA_OFFSET(a) + sizeof(int) * num;
 	int			i;
 
+	/* if no elements, return a zero-dimensional array */
+	if (num == 0)
+	{
+		ARR_NDIM(a) = 0;
+		return a;
+	}
+
 	if (num == ARRNELEMS(a))
 		return a;