Restructered index management, to prepare for add/drop index (WL#1892)

sql/ha_ndbcluster.cc

@@ -1074,7 +1074,7 @@ int ha_ndbcluster::get_metadata(const char *path)
   m_table= (void *)tab; 
   m_table_info= NULL; // Set in external lock
   
-  DBUG_RETURN(build_index_list(ndb, table, ILBP_OPEN));
+  DBUG_RETURN(open_indexes(ndb, table));
 }
 
 static int fix_unique_index_attr_order(NDB_INDEX_DATA &data,
@@ -1111,76 +1111,77 @@ static int fix_unique_index_attr_order(NDB_INDEX_DATA &data,
   DBUG_RETURN(0);
 }
 
-int ha_ndbcluster::build_index_list(Ndb *ndb, TABLE *tab, enum ILBP phase)
+/*
+  Create all the indexes for a table.
+  If any index should fail to be created,
+  the error is returned immediately
+*/
+int ha_ndbcluster::create_indexes(Ndb *ndb, TABLE *tab)
 {
   uint i;
   int error= 0;
   const char *index_name;
-  char unique_index_name[FN_LEN];
-  static const char* unique_suffix= "$unique";
   KEY* key_info= tab->key_info;
   const char **key_name= tab->s->keynames.type_names;
   NDBDICT *dict= ndb->getDictionary();
-  DBUG_ENTER("ha_ndbcluster::build_index_list");
+  DBUG_ENTER("ha_ndbcluster::create_indexes");
   
-  // Save information about all known indexes
   for (i= 0; i < tab->s->keys; i++, key_info++, key_name++)
   {
     index_name= *key_name;
     NDB_INDEX_TYPE idx_type= get_index_type_from_table(i);
-    m_index[i].type= idx_type;
-    if (idx_type == UNIQUE_ORDERED_INDEX || idx_type == UNIQUE_INDEX)
-    {
-      strxnmov(unique_index_name, FN_LEN-1, index_name, unique_suffix, NullS);
-      DBUG_PRINT("info", ("Created unique index name \'%s\' for index %d",
-                          unique_index_name, i));
-    }
-    // Create secondary indexes if in create phase
-    if (phase == ILBP_CREATE)
-    {
-      DBUG_PRINT("info", ("Creating index %u: %s", i, index_name));      
-      switch (idx_type){
-        
-      case PRIMARY_KEY_INDEX:
-        // Do nothing, already created
-        break;
-      case PRIMARY_KEY_ORDERED_INDEX:
-        error= create_ordered_index(index_name, key_info);
-        break;
-      case UNIQUE_ORDERED_INDEX:
-        if (!(error= create_ordered_index(index_name, key_info)))
-          error= create_unique_index(unique_index_name, key_info);
-        break;
-      case UNIQUE_INDEX:
-        if (!(error= check_index_fields_not_null(i)))
-          error= create_unique_index(unique_index_name, key_info);
-        break;
-      case ORDERED_INDEX:
-        error= create_ordered_index(index_name, key_info);
-        break;
-      default:
-        DBUG_ASSERT(FALSE);
-        break;
-      }
+    error= create_index(index_name, key_info, idx_type, i);
     if (error)
     {
       DBUG_PRINT("error", ("Failed to create index %u", i));
-        intern_drop_table();
       break;
     }
+    m_index[i].status= CREATED;
   }
-    // Add handles to index objects
+
+  DBUG_RETURN(error);
+}
+
+void ha_ndbcluster::clear_index(int i)
+{
+  m_index[i].type= UNDEFINED_INDEX;
+  m_index[i].status= UNDEFINED;
+  m_index[i].unique_index= NULL;
+  m_index[i].index= NULL;
+  m_index[i].unique_index_attrid_map= NULL;
+  m_index[i].index_stat=NULL;
+  m_index[i].index_stat_cache_entries=0;
+  m_index[i].index_stat_update_freq=0;
+  m_index[i].index_stat_query_count=0;
+}
+
+void ha_ndbcluster::clear_indexes()
+{
+  for (int i= 0; i < MAX_KEY; i++) clear_index(i);
+}
+
+/*
+  Associate a direct reference to an index handle
+  with an index (for faster access)
+ */
+int ha_ndbcluster::add_index_handle(THD *thd, NDBDICT *dict, KEY *key_info,
+                                    const char *index_name, uint index_no)
+{
+  int error= 0;
+  NDB_INDEX_TYPE idx_type= get_index_type_from_table(index_no);
+  m_index[index_no].type= idx_type;
+  DBUG_ENTER("ha_ndbcluster::get_index_handle");
+
   if (idx_type != PRIMARY_KEY_INDEX && idx_type != UNIQUE_INDEX)
   {
     DBUG_PRINT("info", ("Get handle to index %s", index_name));
     const NDBINDEX *index= dict->getIndex(index_name, m_tabname);
-      if (!index) DBUG_RETURN(1);
-      m_index[i].index= (void *) index;
+    if (!index) ERR_RETURN(dict->getNdbError());
+    m_index[index_no].index= (void *) index;
     // ordered index - add stats
-      NDB_INDEX_DATA& d=m_index[i];
+    NDB_INDEX_DATA& d=m_index[index_no];
     delete d.index_stat;
     d.index_stat=NULL;
-      THD *thd=current_thd;
     if (thd->variables.ndb_index_stat_enable)
     {
       d.index_stat=new NdbIndexStat(index);
@@ -1199,17 +1200,133 @@ int ha_ndbcluster::build_index_list(Ndb *ndb, TABLE *tab, enum ILBP phase)
   }
   if (idx_type == UNIQUE_ORDERED_INDEX || idx_type == UNIQUE_INDEX)
   {
+    char unique_index_name[FN_LEN];
+    static const char* unique_suffix= "$unique";
+    strxnmov(unique_index_name, FN_LEN, index_name, unique_suffix, NullS);
     DBUG_PRINT("info", ("Get handle to unique_index %s", unique_index_name));
     const NDBINDEX *index= dict->getIndex(unique_index_name, m_tabname);
-      if (!index) DBUG_RETURN(1);
-      m_index[i].unique_index= (void *) index;
-      error= fix_unique_index_attr_order(m_index[i], index, key_info);
+    if (!index) ERR_RETURN(dict->getNdbError());
+    m_index[index_no].unique_index= (void *) index;
+    error= fix_unique_index_attr_order(m_index[index_no], index, key_info);
+  }
+  if (!error)
+    m_index[index_no].status= ACTIVE;
+  
+  DBUG_RETURN(error);
+}
+
+/*
+  Associate index handles for each index of a table
+*/
+int ha_ndbcluster::open_indexes(Ndb *ndb, TABLE *tab)
+{
+  uint i;
+  int error= 0;
+  THD *thd=current_thd;
+  NDBDICT *dict= ndb->getDictionary();
+  const char *index_name;
+  KEY* key_info= tab->key_info;
+  const char **key_name= tab->s->keynames.type_names;
+  DBUG_ENTER("ha_ndbcluster::open_indexes");
+  
+  for (i= 0; i < tab->s->keys; i++, key_info++, key_name++)
+  {
+    if ((error= add_index_handle(thd, dict, key_info, *key_name, i)))
+      break;
+  }
+  
+  DBUG_RETURN(error);
+}
+
+/*
+  Renumber indexes in index list by shifting out
+  indexes that are to be dropped
+ */
+int ha_ndbcluster::renumber_indexes(Ndb *ndb, TABLE *tab)
+{
+  uint i;
+  int error= 0;
+  const char *index_name;
+  KEY* key_info= tab->key_info;
+  const char **key_name= tab->s->keynames.type_names;
+  NDBDICT *dict= ndb->getDictionary();
+  DBUG_ENTER("ha_ndbcluster::renumber_indexes");
+  
+  for (i= 0; i < tab->s->keys; i++, key_info++, key_name++)
+  {
+    index_name= *key_name;
+    NDB_INDEX_TYPE idx_type= get_index_type_from_table(i);
+    m_index[i].type= idx_type;
+    if (m_index[i].status == TO_BE_DROPPED) 
+    {
+      DBUG_PRINT("info", ("Shifting index %s(%i) out of the list", 
+                          index_name, i));
+      NDB_INDEX_DATA tmp;
+      uint j= i + 1;
+      // Shift index out of list
+      while(j != MAX_KEY && m_index[j].status != UNDEFINED)
+      {
+        tmp=  m_index[j - 1];
+        m_index[j - 1]= m_index[j];
+        m_index[j]= tmp;
+        j++;
+      }
     }
   }
 
   DBUG_RETURN(error);
 }
 
+/*
+  Drop all indexes that are marked for deletion
+*/
+int ha_ndbcluster::drop_indexes(Ndb *ndb, TABLE *tab)
+{
+  uint i;
+  int error= 0;
+  const char *index_name;
+  KEY* key_info= tab->key_info;
+  const char **key_name= tab->s->keynames.type_names;
+  NDBDICT *dict= ndb->getDictionary();
+  DBUG_ENTER("ha_ndbcluster::drop_indexes");
+  
+  for (i= 0; i < tab->s->keys; i++, key_info++, key_name++)
+  {
+    index_name= *key_name;
+    NDB_INDEX_TYPE idx_type= get_index_type_from_table(i);
+    m_index[i].type= idx_type;
+    if (m_index[i].status == TO_BE_DROPPED)
+    {
+      NdbDictionary::Index *index= 
+        (NdbDictionary::Index *) m_index[i].index;
+      NdbDictionary::Index *unique_index= 
+        (NdbDictionary::Index *) m_index[i].unique_index;
+      
+      if (index)
+      {
+        index_name= index->getName();
+        DBUG_PRINT("info", ("Dropping index %u: %s", i, index_name));  
+        // Drop ordered index from ndb
+        error= drop_ndb_index(index_name);
+      }
+      if (!error)
+        m_index[i].index= NULL;
+      if (!error && unique_index)
+      {
+        index_name= index->getName();
+        DBUG_PRINT("info", ("Dropping index %u: %s", i, index_name));
+        // Drop unique index from ndb
+        error= drop_ndb_index(index_name);
+      }
+      if (error)
+        DBUG_RETURN(error);
+      clear_index(i);
+      continue;
+    }
+  }
+  
+  DBUG_RETURN(error);
+}
 
 /*
   Decode the type of an index from information 
@@ -1217,12 +1334,18 @@ int ha_ndbcluster::build_index_list(Ndb *ndb, TABLE *tab, enum ILBP phase)
 */
 NDB_INDEX_TYPE ha_ndbcluster::get_index_type_from_table(uint inx) const
 {
-  bool is_hash_index=  (table_share->key_info[inx].algorithm ==
+  return get_index_type_from_key(inx, table_share->key_info);
+}
+
+NDB_INDEX_TYPE ha_ndbcluster::get_index_type_from_key(uint inx,
+                                                      KEY *key_info) const
+{
+  bool is_hash_index=  (key_info[inx].algorithm == 
                         HA_KEY_ALG_HASH);
   if (inx == table_share->primary_key)
     return is_hash_index ? PRIMARY_KEY_INDEX : PRIMARY_KEY_ORDERED_INDEX;
   
-  return ((table_share->key_info[inx].flags & HA_NOSAME) ? 
+  return ((key_info[inx].flags & HA_NOSAME) ? 
           (is_hash_index ? UNIQUE_INDEX : UNIQUE_ORDERED_INDEX) :
           ORDERED_INDEX);
 } 
@@ -3481,7 +3604,7 @@ int ha_ndbcluster::external_lock(THD *thd, int lock_type)
       {
         m_table= (void *)tab;
         m_table_version = tab->getObjectVersion();
-        if (!(my_errno= build_index_list(ndb, table, ILBP_OPEN)))
+        if (!(my_errno= open_indexes(ndb, table)))
           DBUG_RETURN(my_errno);
       }
       m_table_info= tab_info;
@@ -4134,20 +4257,69 @@ int ha_ndbcluster::create(const char *name,
                       m_dbname, m_tabname));
 
   // Create secondary indexes
-  my_errno= build_index_list(ndb, form, ILBP_CREATE);
+  my_errno= create_indexes(ndb, form);
 
   if (!my_errno)
     my_errno= write_ndb_file();
+  else
+  {
+    /*
+      Failed to create an index,
+      drop the table (and all it's indexes)
+    */
+    drop_ndb_table();
+  }
 
   DBUG_RETURN(my_errno);
 }
 
+int ha_ndbcluster::create_index(const char *name, KEY *key_info, 
+                                NDB_INDEX_TYPE idx_type, uint idx_no)
+{
+  int error= 0;
+  char unique_name[FN_LEN];
+  static const char* unique_suffix= "$unique";
+  DBUG_ENTER("ha_ndbcluster::create_ordered_index");
+  DBUG_PRINT("info", ("Creating index %u: %s", idx_no, name));  
+
+  if (idx_type == UNIQUE_ORDERED_INDEX || idx_type == UNIQUE_INDEX)
+  {
+    strxnmov(unique_name, FN_LEN, name, unique_suffix, NullS);
+    DBUG_PRINT("info", ("Created unique index name \'%s\' for index %d",
+                        unique_name, idx_no));
+  }
+    
+  switch (idx_type){
+  case PRIMARY_KEY_INDEX:
+    // Do nothing, already created
+    break;
+  case PRIMARY_KEY_ORDERED_INDEX:
+    error= create_ordered_index(name, key_info);
+    break;
+  case UNIQUE_ORDERED_INDEX:
+    if (!(error= create_ordered_index(name, key_info)))
+      error= create_unique_index(unique_name, key_info);
+    break;
+  case UNIQUE_INDEX:
+    if (!(error= check_index_fields_not_null(idx_no)))
+      error= create_unique_index(unique_name, key_info);
+    break;
+  case ORDERED_INDEX:
+    error= create_ordered_index(name, key_info);
+    break;
+  default:
+    DBUG_ASSERT(FALSE);
+    break;
+  }
+  
+  DBUG_RETURN(error);
+}
 
 int ha_ndbcluster::create_ordered_index(const char *name, 
                                         KEY *key_info)
 {
   DBUG_ENTER("ha_ndbcluster::create_ordered_index");
-  DBUG_RETURN(create_index(name, key_info, FALSE));
+  DBUG_RETURN(create_ndb_index(name, key_info, FALSE));
 }
 
 int ha_ndbcluster::create_unique_index(const char *name, 
@@ -4155,7 +4327,7 @@ int ha_ndbcluster::create_unique_index(const char *name,
 {
 
   DBUG_ENTER("ha_ndbcluster::create_unique_index");
-  DBUG_RETURN(create_index(name, key_info, TRUE));
+  DBUG_RETURN(create_ndb_index(name, key_info, TRUE));
 }
 
 
@@ -4163,7 +4335,7 @@ int ha_ndbcluster::create_unique_index(const char *name,
   Create an index in NDB Cluster
  */
 
-int ha_ndbcluster::create_index(const char *name, 
+int ha_ndbcluster::create_ndb_index(const char *name, 
                                      KEY *key_info,
                                      bool unique)
 {
@@ -4201,6 +4373,14 @@ int ha_ndbcluster::create_index(const char *name,
   DBUG_RETURN(0);  
 }
 
+int ha_ndbcluster::drop_ndb_index(const char *name)
+{
+  DBUG_ENTER("ha_ndbcluster::drop_index");
+  DBUG_PRINT("enter", ("name: %s ", name));
+  Ndb *ndb= get_ndb();
+  NdbDictionary::Dictionary *dict= ndb->getDictionary();
+  DBUG_RETURN(dict->dropIndex(name, m_tabname));
+} 
 
 /*
   Rename a table in NDB Cluster
@@ -4298,7 +4478,7 @@ ha_ndbcluster::delete_table(ha_ndbcluster *h, Ndb *ndb,
   int res;
   if (h)
   {
-    res= h->intern_drop_table();
+    res= h->drop_ndb_table();
   }
   else
   {
@@ -4335,7 +4515,7 @@ int ha_ndbcluster::delete_table(const char *name)
   Drop table in NDB Cluster
  */
 
-int ha_ndbcluster::intern_drop_table()
+int ha_ndbcluster::drop_ndb_table()
 {
   Ndb *ndb= get_ndb();
   NdbDictionary::Dictionary *dict= ndb->getDictionary();
@@ -4445,17 +4625,7 @@ ha_ndbcluster::ha_ndbcluster(TABLE_SHARE *table_arg):
   records= ~(ha_rows)0; // uninitialized
   block_size= 1024;
 
-  for (i= 0; i < MAX_KEY; i++)
-  {
-    m_index[i].type= UNDEFINED_INDEX;
-    m_index[i].unique_index= NULL;
-    m_index[i].index= NULL;
-    m_index[i].unique_index_attrid_map= NULL;
-    m_index[i].index_stat=NULL;
-    m_index[i].index_stat_cache_entries=0;
-    m_index[i].index_stat_update_freq=0;
-    m_index[i].index_stat_query_count=0;
-  }
+  clear_indexes();
 
   DBUG_VOID_RETURN;
 }

sql/ha_ndbcluster.h

@@ -54,8 +54,16 @@ typedef enum ndb_index_type {
   ORDERED_INDEX = 5
 } NDB_INDEX_TYPE;
 
+typedef enum ndb_index_status {
+  UNDEFINED = 0,
+  CREATED = 1,
+  ACTIVE = 2,
+  TO_BE_DROPPED = 3
+} NDB_INDEX_STATUS;
+
 typedef struct ndb_index_data {
   NDB_INDEX_TYPE type;
+  NDB_INDEX_STATUS status;  
   void *index;
   void *unique_index;
   unsigned char *unique_index_attrid_map;
@@ -622,17 +630,28 @@ static void set_tabname(const char *pathname, char *tabname);
 			  const char *path,
 			  const char *db,
 			  const char *table_name);
-  int intern_drop_table();
-  int create_index(const char *name, KEY *key_info, bool unique);
+  int drop_ndb_table();
+  int create_ndb_index(const char *name, KEY *key_info, bool unique);
   int create_ordered_index(const char *name, KEY *key_info);
   int create_unique_index(const char *name, KEY *key_info);
+  int create_index(const char *name, KEY *key_info, 
+                   NDB_INDEX_TYPE idx_type, uint idx_no);
+  int drop_ndb_index(const char *name);
+// Index list management
+  int create_indexes(Ndb *ndb, TABLE *tab);
+  void clear_index(int i);
+  void clear_indexes();
+  int open_indexes(Ndb *ndb, TABLE *tab);
+  int renumber_indexes(Ndb *ndb, TABLE *tab);
+  int drop_indexes(Ndb *ndb, TABLE *tab);
+  int add_index_handle(THD *thd, NdbDictionary::Dictionary *dict,
+                       KEY *key_info, const char *index_name, uint index_no);
   int initialize_autoincrement(const void *table);
-  enum ILBP {ILBP_CREATE = 0, ILBP_OPEN = 1}; // Index List Build Phase
-  int build_index_list(Ndb *ndb, TABLE *tab, enum ILBP phase);
   int get_metadata(const char* path);
   void release_metadata();
   NDB_INDEX_TYPE get_index_type(uint idx_no) const;
   NDB_INDEX_TYPE get_index_type_from_table(uint index_no) const;
+  NDB_INDEX_TYPE get_index_type_from_key(uint index_no, KEY *key_info) const;
   int check_index_fields_not_null(uint index_no);
 
   uint set_up_partition_info(partition_info *part_info,