Implementing pre_create option test and setting of default values.

Currently, only TABLE_TYPE is tested, and if wrong or unspecified,
is replaced by the default value DOS.

- Test on type was moved from create to pre_create
- pre_create is now called unconditionally and must return true
  on error and false otherwise.
- Warnings are produced if the table type was changed.
- The errors have specific error messages (instead of being warnings
  with an error message telling that a table must have columns)

Modified:
ha_connect.cc
ha_connect.h
handler.h
sql_table.cc

sql/handler.h

@@ -1932,8 +1932,8 @@ class handler :public Sql_alloc
   /* ha_ methods: pubilc wrappers for private virtual API */
   
   /* Added by O. Bertrand */
-  virtual bool pre_create(THD *thd, void *crt_info, void *alt_info)
-                          {return true;}
+  virtual bool pre_create(THD *thd, HA_CREATE_INFO *crt_info, void *alt_info)
+                          {return false;}
   
   int ha_open(TABLE *table, const char *name, int mode, uint test_if_locked);
   int ha_index_init(uint idx, bool sorted)

sql/sql_table.cc

@@ -4134,7 +4134,6 @@ bool mysql_create_table_no_lock(THD *thd,
                        db, table_name, internal_tmp_table));
 
 
-  /* Check for duplicate fields and check type of table to create */
   if (check_engine(thd, db, table_name, create_info))
     DBUG_RETURN(TRUE);
 
@@ -4152,6 +4151,17 @@ bool mysql_create_table_no_lock(THD *thd,
     mem_alloc_error(sizeof(handler));
     DBUG_RETURN(TRUE);
   }
+  /* Let handlers test and update create table definition. */
+  if (file->pre_create(thd, create_info, alter_info))
+    DBUG_RETURN(TRUE);    // Error message was created in pre_create
+
+  /* Check for duplicate fields and check type of table to create */
+  if (!alter_info->create_list.elements)
+  {
+    my_message(ER_TABLE_MUST_HAVE_COLUMNS, ER(ER_TABLE_MUST_HAVE_COLUMNS),
+               MYF(0));
+    DBUG_RETURN(TRUE);
+  }
 #ifdef WITH_PARTITION_STORAGE_ENGINE
   partition_info *part_info= thd->work_part_info;
 
@@ -4314,14 +4324,6 @@ bool mysql_create_table_no_lock(THD *thd,
   }
 #endif
 
-  // Added by O. Bertrand
-  if (!alter_info->create_list.elements &&
-      file->pre_create(thd, create_info, alter_info))
-  {
-    my_message(ER_TABLE_MUST_HAVE_COLUMNS, ER(ER_TABLE_MUST_HAVE_COLUMNS),
-               MYF(0));
-    DBUG_RETURN(TRUE);
-  }
   if (mysql_prepare_create_table(thd, create_info, alter_info,
                                  internal_tmp_table,
                                  &db_options, file,

storage/connect/ha_connect.cc

@@ -3301,7 +3301,8 @@ bool ha_connect::add_fields(THD *thd, void *alt_info,
   @note
   Not really implemented yet.
 */
-bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
+bool ha_connect::pre_create(THD *thd, HA_CREATE_INFO *create_info,
+                            void *alt_info)
 {
   char        spc= ',', qch= 0;
   const char *typn= "?";
@@ -3315,10 +3316,11 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
   uint        tm, fnc= FNC_NO, supfnc= (FNC_NO | FNC_COL);
   bool        b= false, ok= false, dbf= false;
   TABTYPE     ttp= TAB_UNDEF;
-  LEX_STRING *comment, *name;
-  HA_CREATE_INFO *create_info= (HA_CREATE_INFO *)crt_info;
+  LEX_STRING *comment, *name, *val;
+  MEM_ROOT   *mem= thd->mem_root;
   CHARSET_INFO *cs;
-  engine_option_value *pov;
+  Alter_info *alter_info= (Alter_info*)alt_info;
+  engine_option_value *pov, *start= create_info->option_list, *end= NULL;
   PQRYRES     qrp;
   PCOLRES     crp;
   PGLOBAL     g= GetPlug(thd);
@@ -3331,7 +3333,7 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
   db= thd->db;                     // Default value
 
   // Get the useful create options
-  for (pov= create_info->option_list; pov; pov= pov->next)
+  for (pov= start; pov; pov= pov->next) {
     if (!stricmp(pov->name.str, "table_type")) {
       typn= pov->value.str;
       ttp= GetTypeID(typn);
@@ -3368,6 +3370,28 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
       mxr= atoi(GetListOption("maxerr", pov->value.str, "0"));
     } // endelse option_list
 
+    end= pov;
+    } // endfor pov
+
+  // Check table type
+  if (ttp == TAB_UNDEF || ttp == TAB_NIY) {
+    sprintf(g->Message, "Unknown Table_type '%s'", typn);
+    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
+    strcpy(g->Message, "Using Table_type DOS");
+    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
+    ttp= TAB_DOS;
+    typn= "DOS";
+    name= thd->make_lex_string(NULL, "table_type", 10, true);
+    val= thd->make_lex_string(NULL, typn, strlen(typn), true);
+    pov= new(mem) engine_option_value(*name, *val, false, &start, &end);
+    } // endif ttp
+
+  // Test whether columns must be specified
+  if (alter_info->create_list.elements)
+    return false;
+
+  dbf= ttp == TAB_DBF;
+
   if (!tab && !(fnc & (FNC_TABLE | FNC_COL)))
     tab= (char*)create_info->alias;
 
@@ -3450,7 +3474,7 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
             qrp= ODBCDrivers(g, true);
             break;
           default:
-            sprintf(g->Message, "invalid catfunc %c", fncn);
+            sprintf(g->Message, "invalid catfunc %s", fncn);
         } // endswitch info
 
         break;
@@ -3475,7 +3499,7 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
       } // endswitch ttp
 
     if (!qrp) {
-      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
+      my_message(ER_UNKNOWN_ERROR, g->Message, MYF(0));
       return true;
       } // endif qrp
 
@@ -3550,7 +3574,7 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
           // typ must be PLG type, not SQL type
           if (!(plgtyp= TranslateSQLType(typ, dec, len))) {
             sprintf(g->Message, "Unsupported SQL type %d", typ);
-            push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
+            my_message(ER_UNKNOWN_ERROR, g->Message, MYF(0));
             return true;
           } else
             typ= plgtyp;
@@ -3576,7 +3600,7 @@ bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
     return b;
     } // endif ok
 
-  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
+  my_message(ER_UNKNOWN_ERROR, g->Message, MYF(0));
   return true;
 } // end of pre_create
 
@@ -3612,7 +3636,6 @@ int ha_connect::create(const char *name, TABLE *table_arg,
   bool    dbf;
   Field* *field;
   Field  *fp;
-  TABTYPE ttp;
   TABLE  *st= table;                       // Probably unuseful
   PIXDEF  xdp, pxd= NULL, toidx= NULL;
   PGLOBAL g= GetPlug(table_arg->in_use);
@@ -3626,31 +3649,8 @@ int ha_connect::create(const char *name, TABLE *table_arg,
   if (!g) {
     rc= HA_ERR_INTERNAL_ERROR;
     DBUG_RETURN(rc);
-    } // endif g
-
-  // Check table type
-  ttp= GetTypeID(options->type);
-
-  if (ttp == TAB_UNDEF || ttp == TAB_NIY) {
-#if 0   // Does not work. It's too late, FRM is constructed yet.
-    THD *thd= table_arg->in_use;
-
-    ttp= TAB_DOS;
-    options->type= strmake_root(thd->mem_root, "DOS", strlen("DOS"));
-    strcpy(g->Message, "Table_type defaulted to DOS");
-    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
-#endif
-    if (options->type)
-      sprintf(g->Message, "Unsupported table type %s", options->type);
-    else
-      strcpy(g->Message, "Unspecified table type");
-
-    rc= HA_ERR_INTERNAL_ERROR;
-    my_printf_error(ER_UNKNOWN_ERROR, g->Message, MYF(0));
-    DBUG_RETURN(rc);
-    } // endif ttp
-
-  dbf= ttp == TAB_DBF;
+  } else
+    dbf= (GetTypeID(options->type) == TAB_DBF);
 
   // Check column types
   for (field= table_arg->field; *field; field++) {

storage/connect/ha_connect.h

@@ -94,7 +94,7 @@ class ha_connect: public handler
   PIXDEF   GetIndexInfo(int n);
   const char *GetDBName(const char *name);
   const char *GetTableName(void);
-  int       GetColNameLen(Field *fp);
+  int      GetColNameLen(Field *fp);
   char    *GetColName(Field *fp);
   void     AddColName(char *cp, Field *fp);
   TABLE    *GetTable(void) {return table;}
@@ -335,7 +335,7 @@ const char *GetValStr(OPVAL vop, bool neg);
   ha_rows records_in_range(uint inx, key_range *min_key,
                            key_range *max_key);
   int delete_table(const char *from);
-  bool pre_create(THD *thd, void *crt_info, void *alt_info);
+  bool pre_create(THD *thd, HA_CREATE_INFO *crt_info, void *alt_info);
   int create(const char *name, TABLE *form,
              HA_CREATE_INFO *create_info);                      ///< required
   bool check_if_incompatible_data(HA_CREATE_INFO *info,