BTW it does not add encodign it just patches existing one (KOI8) to

support two - KOI8-R and KOI8-U (latter is superset of the former if
not to take to the account pseudographics)

Andy Rysin

src/backend/utils/mb/Unicode/KOI8_to_utf8.map

@@ -35,32 +35,32 @@ static pg_local_to_utf LUmapKOI8[ 128 ] = {
   {0x00a1, 0xe29591},
   {0x00a2, 0xe29592},
   {0x00a3, 0xd191},
-  {0x00a4, 0xe29593},
+  {0x00a4, 0xd194},
   {0x00a5, 0xe29594},
-  {0x00a6, 0xe29595},
-  {0x00a7, 0xe29596},
+  {0x00a6, 0xd196},
+  {0x00a7, 0xd197},
   {0x00a8, 0xe29597},
   {0x00a9, 0xe29598},
   {0x00aa, 0xe29599},
   {0x00ab, 0xe2959a},
   {0x00ac, 0xe2959b},
-  {0x00ad, 0xe2959c},
+  {0x00ad, 0xd291},
   {0x00ae, 0xe2959d},
   {0x00af, 0xe2959e},
   {0x00b0, 0xe2959f},
   {0x00b1, 0xe295a0},
   {0x00b2, 0xe295a1},
   {0x00b3, 0xd081},
-  {0x00b4, 0xe295a2},
+  {0x00b4, 0xd084},
   {0x00b5, 0xe295a3},
-  {0x00b6, 0xe295a4},
-  {0x00b7, 0xe295a5},
+  {0x00b6, 0xd086},
+  {0x00b7, 0xd087},
   {0x00b8, 0xe295a6},
   {0x00b9, 0xe295a7},
   {0x00ba, 0xe295a8},
   {0x00bb, 0xe295a9},
   {0x00bc, 0xe295aa},
-  {0x00bd, 0xe295ab},
+  {0x00bd, 0xd290},
   {0x00be, 0xe295ac},
   {0x00bf, 0xc2a9},
   {0x00c0, 0xd18e},

src/backend/utils/mb/Unicode/utf8_to_KOI8.map

@@ -6,6 +6,9 @@ static pg_utf_to_local ULmap_KOI8[ 128 ] = {
   {0xc2b7, 0x009e},
   {0xc3b7, 0x009f},
   {0xd081, 0x00b3},
+  {0xd084, 0x00b4},
+  {0xd086, 0x00b6},
+  {0xd087, 0x00b7},
   {0xd090, 0x00e1},
   {0xd091, 0x00e2},
   {0xd092, 0x00f7},
@@ -71,6 +74,11 @@ static pg_utf_to_local ULmap_KOI8[ 128 ] = {
   {0xd18e, 0x00c0},
   {0xd18f, 0x00d1},
   {0xd191, 0x00a3},
+  {0xd194, 0x00a4},
+  {0xd196, 0x00a6},
+  {0xd197, 0x00a7},
+  {0xd290, 0x00bd},
+  {0xd291, 0x00ad},
   {0xe28899, 0x0095},
   {0xe2889a, 0x0096},
   {0xe28988, 0x0097},
@@ -92,31 +100,23 @@ static pg_utf_to_local ULmap_KOI8[ 128 ] = {
   {0xe29590, 0x00a0},
   {0xe29591, 0x00a1},
   {0xe29592, 0x00a2},
-  {0xe29593, 0x00a4},
   {0xe29594, 0x00a5},
-  {0xe29595, 0x00a6},
-  {0xe29596, 0x00a7},
   {0xe29597, 0x00a8},
   {0xe29598, 0x00a9},
   {0xe29599, 0x00aa},
   {0xe2959a, 0x00ab},
   {0xe2959b, 0x00ac},
-  {0xe2959c, 0x00ad},
   {0xe2959d, 0x00ae},
   {0xe2959e, 0x00af},
   {0xe2959f, 0x00b0},
   {0xe295a0, 0x00b1},
   {0xe295a1, 0x00b2},
-  {0xe295a2, 0x00b4},
   {0xe295a3, 0x00b5},
-  {0xe295a4, 0x00b6},
-  {0xe295a5, 0x00b7},
   {0xe295a6, 0x00b8},
   {0xe295a7, 0x00b9},
   {0xe295a8, 0x00ba},
   {0xe295a9, 0x00bb},
   {0xe295aa, 0x00bc},
-  {0xe295ab, 0x00bd},
   {0xe295ac, 0x00be},
   {0xe29680, 0x008b},
   {0xe29684, 0x008c},