MDEV-14593 human-readable XA RECOVER.

        The 'data' field in the XA RECOVER resultset changed
        to be charset_bin. It seems to me right and also
        --binary-as-hex starts working.  The XA RECOVER FORMAT='SQL' option
        implemented.  It returns the XID string that fits to be an argument for the
        XA ... statements.

mysql-test/r/binary_to_hex.result

@@ -115,3 +115,7 @@ c9: 0x000000000101000000000000000000F03F000000000000F03F
 #Print the table contents in html format
 
 <TABLE BORDER=1><TR><TH>c1</TH><TH>c2</TH><TH>c3</TH><TH>c4</TH><TH>c5</TH><TH>c6</TH><TH>c7</TH><TH>c8</TH><TH>c9</TH></TR><TR><TD>0x74696E79626C6F622D74657874207265616461626C65</TD><TD>0x626C6F622D74657874207265616461626C65</TD><TD>0x6D656469756D626C6F622D74657874207265616461626C65</TD><TD>0x6C6F6E67626C6F622D74657874207265616461626C65</TD><TD>0x74657874207265616461626C65</TD><TD>0x01</TD><TD>0x63</TD><TD>0x7661726961626C65</TD><TD>0x000000000101000000000000000000F03F000000000000F03F</TD></TR></TABLE><TABLE BORDER=1><TR><TH>id</TH><TH>col1</TH><TH>col2</TH></TR><TR><TD>1</TD><TD>0xAB123400000000000000</TD><TD>0x123ABC</TD></TR><TR><TD>2</TD><TD>0xDE123400000000000000</TD><TD>0x123DEF</TD></TR></TABLE>DROP TABLE t1, t2;
+create table t1 (a int);
+formatID	gtrid_length	bqual_length	data
+1	3	2	0x7472316271
+DROP TABLE t1;

mysql-test/r/xa.result

@@ -60,6 +60,59 @@ a
 20
 disconnect con1;
 connection default;
+xa start 'tr1';
+insert t1 values (40);
+xa end 'tr1';
+xa prepare 'tr1';
+xa recover format='SQL';
+formatID	gtrid_length	bqual_length	data
+1	3	0	'tr1'
+xa rollback 'tr1';
+xa start 'tr1', 'bq';
+insert t1 values (40);
+xa end 'tr1', 'bq';
+xa prepare 'tr1', 'bq';
+xa recover format='SQL';
+formatID	gtrid_length	bqual_length	data
+1	3	2	'tr1','bq'
+xa rollback 'tr1', 'bq';
+xa start 'tr1', 'bq', 3;
+insert t1 values (40);
+xa end 'tr1', 'bq', 3;
+xa prepare 'tr1', 'bq', 3;
+xa recover format='SQL';
+formatID	gtrid_length	bqual_length	data
+3	3	2	'tr1','bq',3
+xa rollback 'tr1', 'bq', 3;
+xa start 'tr1#$';
+insert t1 values (40);
+xa end 'tr1#$';
+xa prepare 'tr1#$';
+xa recover format='SQL';
+formatID	gtrid_length	bqual_length	data
+1	5	0	X'7472312324'
+xa rollback 'tr1#$';
+xa start 'tr1#$', 'bq';
+insert t1 values (40);
+xa end 'tr1#$', 'bq';
+xa prepare 'tr1#$', 'bq';
+xa recover format='SQL';
+formatID	gtrid_length	bqual_length	data
+1	5	2	X'7472312324',X'6271'
+xa rollback 'tr1#$', 'bq';
+xa start 'tr1#$', 'bq', 3;
+insert t1 values (40);
+xa end 'tr1#$', 'bq', 3;
+xa prepare 'tr1#$', 'bq', 3;
+xa recover format='RAW';
+formatID	gtrid_length	bqual_length	data
+3	5	2	tr1#$bq
+xa recover format='PLAIN';
+ERROR HY000: Unknown XA RECOVER format name: 'PLAIN'
+xa recover format='SQL';
+formatID	gtrid_length	bqual_length	data
+3	5	2	X'7472312324',X'6271',3
+xa rollback 'tr1#$', 'bq', 3;
 drop table t1;
 drop table if exists t1;
 create table t1(a int, b int, c varchar(20), primary key(a)) engine = innodb;

mysql-test/t/binary_to_hex.test

@@ -72,5 +72,25 @@ SELECT * FROM t2;
 #Cleanup
 DROP TABLE t1, t2;
 
+# MDEV-14593 human-readable XA RECOVER 
+
+create table t1 (a int);
+
+--write_file $MYSQLTEST_VARDIR/tmp/mdev-14593.sql
+DELIMITER /
+XA START 'tr1', 'bq'/
+INSERT INTO t1 VALUES (0)/
+XA END 'tr1', 'bq'/
+XA PREPARE 'tr1', 'bq'/
+XA RECOVER/
+XA ROLLBACK 'tr1', 'bq'/
+EOF
+--exec $MYSQL test --binary-as-hex < $MYSQLTEST_VARDIR/tmp/mdev-14593.sql 2>&1
+remove_file $MYSQLTEST_VARDIR/tmp/mdev-14593.sql;
+
+
+#Cleanup
+DROP TABLE t1;
+
 # Wait till all disconnects are completed
  --source include/wait_until_count_sessions.inc

mysql-test/t/xa.test

@@ -83,6 +83,53 @@ select * from t1;
 
 disconnect con1;
 connection default;
+
+# MDEV-14593 human-readable XA RECOVER
+xa start 'tr1';
+insert t1 values (40);
+xa end 'tr1';
+xa prepare 'tr1';
+xa recover format='SQL';
+xa rollback 'tr1';
+
+xa start 'tr1', 'bq';
+insert t1 values (40);
+xa end 'tr1', 'bq';
+xa prepare 'tr1', 'bq';
+xa recover format='SQL';
+xa rollback 'tr1', 'bq';
+
+xa start 'tr1', 'bq', 3;
+insert t1 values (40);
+xa end 'tr1', 'bq', 3;
+xa prepare 'tr1', 'bq', 3;
+xa recover format='SQL';
+xa rollback 'tr1', 'bq', 3;
+
+xa start 'tr1#$';
+insert t1 values (40);
+xa end 'tr1#$';
+xa prepare 'tr1#$';
+xa recover format='SQL';
+xa rollback 'tr1#$';
+
+xa start 'tr1#$', 'bq';
+insert t1 values (40);
+xa end 'tr1#$', 'bq';
+xa prepare 'tr1#$', 'bq';
+xa recover format='SQL';
+xa rollback 'tr1#$', 'bq';
+
+xa start 'tr1#$', 'bq', 3;
+insert t1 values (40);
+xa end 'tr1#$', 'bq', 3;
+xa prepare 'tr1#$', 'bq', 3;
+xa recover format='RAW';
+--error ER_UNKNOWN_EXPLAIN_FORMAT
+xa recover format='PLAIN';
+xa recover format='SQL';
+xa rollback 'tr1#$', 'bq', 3;
+
 drop table t1;
 
 #
@@ -379,7 +426,6 @@ connection default;
 DROP TABLE t1, t2;
 disconnect con2;
 
-
 # Wait till all disconnects are completed
 --source include/wait_until_count_sessions.inc
 

sql/handler.cc

@@ -1981,6 +1981,97 @@ int ha_recover(HASH *commit_list)
   DBUG_RETURN(0);
 }
 
+/**
+  return the XID as it appears in the SQL function's arguments.
+  So this string can be passed to XA START, XA PREPARE etc...
+
+  @note
+    the 'buf' has to have space for at least SQL_XIDSIZE bytes.
+*/
+
+
+/*
+  'a'..'z' 'A'..'Z', '0'..'9'
+  and '-' '_' ' ' symbols don't have to be
+  converted.
+*/
+
+static const char xid_needs_conv[128]=
+{
+  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+  0,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,
+  0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,
+  1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+  0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,
+  1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+  0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1
+};
+
+uint get_sql_xid(XID *xid, char *buf)
+{
+  int tot_len= xid->gtrid_length + xid->bqual_length;
+  int i;
+  const char *orig_buf= buf;
+
+  for (i=0; i<tot_len; i++)
+  {
+    uchar c= ((uchar *) xid->data)[i];
+    if (c >= 128 || xid_needs_conv[c])
+      break;
+  }
+
+  if (i >= tot_len)
+  {
+    /* No need to convert characters to hexadecimals. */
+    *buf++= '\'';
+    memcpy(buf, xid->data, xid->gtrid_length);
+    buf+= xid->gtrid_length;
+    *buf++= '\'';
+    if (xid->bqual_length > 0 || xid->formatID != 1)
+    {
+      *buf++= ',';
+      *buf++= '\'';
+      memcpy(buf, xid->data+xid->gtrid_length, xid->bqual_length);
+      buf+= xid->bqual_length;
+      *buf++= '\'';
+    }
+  }
+  else
+  {
+    *buf++= 'X';
+    *buf++= '\'';
+    for (i= 0; i < xid->gtrid_length; i++)
+    {
+      *buf++=_dig_vec_lower[((uchar*) xid->data)[i] >> 4];
+      *buf++=_dig_vec_lower[((uchar*) xid->data)[i] & 0x0f];
+    }
+    *buf++= '\'';
+    if (xid->bqual_length > 0 || xid->formatID != 1)
+    {
+      *buf++= ',';
+      *buf++= 'X';
+      *buf++= '\'';
+      for (; i < tot_len; i++)
+      {
+        *buf++=_dig_vec_lower[((uchar*) xid->data)[i] >> 4];
+        *buf++=_dig_vec_lower[((uchar*) xid->data)[i] & 0x0f];
+      }
+      *buf++= '\'';
+    }
+  }
+
+  if (xid->formatID != 1)
+  {
+    *buf++= ',';
+    buf+= my_longlong10_to_str_8bit(&my_charset_bin, buf,
+            MY_INT64_NUM_DECIMAL_DIGITS, -10, xid->formatID);
+  }
+
+  return buf - orig_buf;
+}
+
+
 /**
   return the list of XID's to a client, the same way SHOW commands do.
 
@@ -1990,7 +2081,8 @@ int ha_recover(HASH *commit_list)
     It can be easily fixed later, if necessary.
 */
 
-static my_bool xa_recover_callback(XID_STATE *xs, Protocol *protocol)
+static my_bool xa_recover_callback(XID_STATE *xs, Protocol *protocol,
+                  char *data, uint data_len, CHARSET_INFO *data_cs)
 {
   if (xs->xa_state == XA_PREPARED)
   {
@@ -1998,8 +2090,7 @@ static my_bool xa_recover_callback(XID_STATE *xs, Protocol *protocol)
     protocol->store_longlong((longlong) xs->xid.formatID, FALSE);
     protocol->store_longlong((longlong) xs->xid.gtrid_length, FALSE);
     protocol->store_longlong((longlong) xs->xid.bqual_length, FALSE);
-    protocol->store(xs->xid.data, xs->xid.gtrid_length + xs->xid.bqual_length,
-                    &my_charset_bin);
+    protocol->store(data, data_len, data_cs);
     if (protocol->write())
       return TRUE;
   }
@@ -2007,11 +2098,28 @@ static my_bool xa_recover_callback(XID_STATE *xs, Protocol *protocol)
 }
 
 
+static my_bool xa_recover_callback_short(XID_STATE *xs, Protocol *protocol)
+{
+  return xa_recover_callback(xs, protocol, xs->xid.data,
+      xs->xid.gtrid_length + xs->xid.bqual_length, &my_charset_bin);
+}
+
+
+static my_bool xa_recover_callback_verbose(XID_STATE *xs, Protocol *protocol)
+{
+  char buf[SQL_XIDSIZE];
+  uint len= get_sql_xid(&xs->xid, buf);
+  return xa_recover_callback(xs, protocol, buf, len,
+                             &my_charset_utf8_general_ci);
+}
+
+
 bool mysql_xa_recover(THD *thd)
 {
   List<Item> field_list;
   Protocol *protocol= thd->protocol;
   MEM_ROOT *mem_root= thd->mem_root;
+  my_hash_walk_action action;
   DBUG_ENTER("mysql_xa_recover");
 
   field_list.push_back(new (mem_root)
@@ -2023,16 +2131,32 @@ bool mysql_xa_recover(THD *thd)
   field_list.push_back(new (mem_root)
                        Item_int(thd, "bqual_length", 0,
                                 MY_INT32_NUM_DECIMAL_DIGITS), mem_root);
-  field_list.push_back(new (mem_root)
-                       Item_empty_string(thd, "data",
-                                         XIDDATASIZE), mem_root);
+  {
+    uint len;
+    CHARSET_INFO *cs;
+
+    if (thd->lex->verbose)
+    {
+      len= SQL_XIDSIZE;
+      cs= &my_charset_utf8_general_ci;
+      action= (my_hash_walk_action) xa_recover_callback_verbose;
+    }
+    else
+    {
+      len= XIDDATASIZE;
+      cs= &my_charset_bin;
+      action= (my_hash_walk_action) xa_recover_callback_short;
+    }
+
+    field_list.push_back(new (mem_root)
+                         Item_empty_string(thd, "data", len, cs), mem_root);
+  }
 
   if (protocol->send_result_set_metadata(&field_list,
                             Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
     DBUG_RETURN(1);
 
-  if (xid_cache_iterate(thd, (my_hash_walk_action) xa_recover_callback,
-                        protocol))
+  if (xid_cache_iterate(thd, action, protocol))
     DBUG_RETURN(1);
   my_eof(thd);
   DBUG_RETURN(0);

sql/handler.h

@@ -652,6 +652,15 @@ struct xid_t {
 };
 typedef struct xid_t XID;
 
+/*
+  The size of XID string representation in the form
+  'gtrid', 'bqual', formatID
+  see xid_t::get_sql_string() for details.
+*/
+#define SQL_XIDSIZE (XIDDATASIZE * 2 + 8 + MY_INT64_NUM_DECIMAL_DIGITS)
+/* The 'buf' has to have space for at least SQL_XIDSIZE bytes. */
+uint get_sql_xid(XID *xid, char *buf);
+
 /* for recover() handlerton call */
 #define MIN_XID_LIST_SIZE  128
 #define MAX_XID_LIST_SIZE  (1024*128)

sql/share/errmsg-utf8.txt

@@ -6850,8 +6850,8 @@ ER_CANT_SET_GTID_NEXT_WHEN_OWNING_GTID
   eng "GTID_NEXT cannot be changed by a client that owns a GTID. The client owns %s. Ownership is released on COMMIT or ROLLBACK"
 
 ER_UNKNOWN_EXPLAIN_FORMAT
-  eng "Unknown EXPLAIN format name: '%s'"
-  rus "Неизвестное имя формата команды EXPLAIN: '%s'"
+  eng "Unknown %s format name: '%s'"
+  rus "Неизвестное имя формата команды %s: '%s'"
 
 ER_CANT_EXECUTE_IN_READ_ONLY_TRANSACTION 25006
   eng "Cannot execute statement in a READ ONLY transaction"

sql/sql_yacc.yy

@@ -1682,7 +1682,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
         opt_default_time_precision
         case_stmt_body opt_bin_mod
         opt_if_exists_table_element opt_if_not_exists_table_element
-	opt_recursive
+	opt_recursive opt_format_xid
 
 %type <object_ddl_options>
         create_or_replace
@@ -16810,9 +16810,26 @@ xa:
           {
             Lex->sql_command = SQLCOM_XA_ROLLBACK;
           }
-        | XA_SYM RECOVER_SYM
+        | XA_SYM RECOVER_SYM opt_format_xid
           {
             Lex->sql_command = SQLCOM_XA_RECOVER;
+            Lex->verbose= $3;
+          }
+        ;
+
+opt_format_xid:
+         /* empty */ { $$= false; }
+        | FORMAT_SYM '=' ident_or_text
+          {
+            if (!my_strcasecmp(system_charset_info, $3.str, "SQL"))
+              $$= true;
+            else if (!my_strcasecmp(system_charset_info, $3.str, "RAW"))
+              $$= false;
+            else
+            {
+              my_yyabort_error((ER_UNKNOWN_EXPLAIN_FORMAT, MYF(0), "XA RECOVER", $3.str));
+              $$= false;
+            }
           }
         ;