intarray: return empty zero-dimensional array for an empty array

bmomjian · bmomjian · commit c155f654b4f7 · 2013-09-07T11:44:33.000-04:00
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
diff --git 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;
 
