Add foreign data wrapper error code values for SQL/MED.

Extracted from a much larger patch by Shigeru Hanada.

src/include/utils/errcodes.h

@@ -343,6 +343,35 @@
 #define ERRCODE_CONFIG_FILE_ERROR			MAKE_SQLSTATE('F','0', '0','0','0')
 #define ERRCODE_LOCK_FILE_EXISTS			MAKE_SQLSTATE('F','0', '0','0','1')
 
+/* Class HV - Foreign Data Wrapper Error (SQL/MED-specific error class) */
+#define ERRCODE_FDW_ERROR					MAKE_SQLSTATE('H','V', '0','0','0')
+#define ERRCODE_FDW_COLUMN_NAME_NOT_FOUND	MAKE_SQLSTATE('H','V', '0','0','5')
+#define ERRCODE_FDW_DYNAMIC_PARAMETER_VALUE_NEEDED	MAKE_SQLSTATE('H','V', '0','0','2')
+#define ERRCODE_FDW_FUNCTION_SEQUENCE_ERROR	MAKE_SQLSTATE('H','V', '0','1','0')
+#define ERRCODE_FDW_INCONSISTENT_DESCRIPTOR_INFORMATION	MAKE_SQLSTATE('H','V', '0','2','1')
+#define ERRCODE_FDW_INVALID_ATTRIBUTE_VALUE	MAKE_SQLSTATE('H','V', '0','2','4')
+#define ERRCODE_FDW_INVALID_COLUMN_NAME	MAKE_SQLSTATE('H','V', '0','0','7')
+#define ERRCODE_FDW_INVALID_COLUMN_NUMBER	MAKE_SQLSTATE('H','V', '0','0','8')
+#define ERRCODE_FDW_INVALID_DATA_TYPE		MAKE_SQLSTATE('H','V', '0','0','4')
+#define ERRCODE_FDW_INVALID_DATA_TYPE_DESCRIPTORS	MAKE_SQLSTATE('H','V', '0','0','6')
+#define ERRCODE_FDW_INVALID_DESCRIPTOR_FIELD_IDENTIFIER	MAKE_SQLSTATE('H','V', '0','9','1')
+#define ERRCODE_FDW_INVALID_HANDLE			MAKE_SQLSTATE('H','V', '0','0','B')
+#define ERRCODE_FDW_INVALID_OPTION_INDEX	MAKE_SQLSTATE('H','V', '0','0','C')
+#define ERRCODE_FDW_INVALID_OPTION_NAME		MAKE_SQLSTATE('H','V', '0','0','D')
+#define ERRCODE_FDW_INVALID_STRING_LENGTH_OR_BUFFER_LENGTH	MAKE_SQLSTATE('H','V', '0','9','0')
+#define ERRCODE_FDW_INVALID_STRING_FORMAT	MAKE_SQLSTATE('H','V', '0','0','A')
+#define ERRCODE_FDW_INVALID_USE_OF_NULL_POINTER	MAKE_SQLSTATE('H','V', '0','0','9')
+#define ERRCODE_FDW_TOO_MANY_HANDLES		MAKE_SQLSTATE('H','V', '0','1','4')
+#define ERRCODE_FDW_OUT_OF_MEMORY			MAKE_SQLSTATE('H','V', '0','0','1')
+#define ERRCODE_FDW_NO_SCHEMAS				MAKE_SQLSTATE('H','V', '0','0','P')
+#define ERRCODE_FDW_OPTION_NAME_NOT_FOUND	MAKE_SQLSTATE('H','V', '0','0','J')
+#define ERRCODE_FDW_REPLY_HANDLE			MAKE_SQLSTATE('H','V', '0','0','K')
+#define ERRCODE_FDW_SCHEMA_NOT_FOUND		MAKE_SQLSTATE('H','V', '0','0','Q')
+#define ERRCODE_FDW_TABLE_NOT_FOUND			MAKE_SQLSTATE('H','V', '0','0','R')
+#define ERRCODE_FDW_UNALBE_TO_CREATE_EXECUTION	MAKE_SQLSTATE('H','V', '0','0','L')
+#define ERRCODE_FDW_UNABLE_TO_CREATE_REPLY	MAKE_SQLSTATE('H','V', '0','0','M')
+#define ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION	MAKE_SQLSTATE('H','V', '0','0','N')
+
 /* Class P0 - PL/pgSQL Error (PostgreSQL-specific error class) */
 #define ERRCODE_PLPGSQL_ERROR				MAKE_SQLSTATE('P','0', '0','0','0')
 #define ERRCODE_RAISE_EXCEPTION				MAKE_SQLSTATE('P','0', '0','0','1')