WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table

The attached patch adds a method
handlerton::fill_is_table that can be used
instead of having to create specific
handlerton::fill_*_table methods.

sql/ha_ndbcluster.cc:
  WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table
  
  Implemented the method ndbcluster_fill_is_table
  that uses the supplied table id to switch to the
  appropriate fill_*_table method.
sql/handler.h:
  WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table
  
  Moved the enum_schema_table enumeration
  from table.h to here. 
  
  contains the declaration for the new method
  fill_is_tables.
sql/sql_show.cc:
  WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table
  
  calls the fill_is_table method instead of the
  fill_files_table method.
sql/table.h:
  WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table
  
  removed the earlier definition of enum_schema_tables.

sql/ha_ndbcluster.cc

@@ -94,6 +94,11 @@ static bool ndbcluster_show_status(handlerton *hton, THD*,
 static int ndbcluster_alter_tablespace(handlerton *hton,
                                        THD* thd, 
                                        st_alter_tablespace *info);
+static int ndbcluster_fill_is_table(handlerton *hton,
+                                    THD *thd, 
+                                    TABLE_LIST *tables, 
+                                    COND *cond,
+                                    enum enum_schema_tables);
 static int ndbcluster_fill_files_table(handlerton *hton,
                                        THD *thd, 
                                        TABLE_LIST *tables, 
@@ -7403,7 +7408,7 @@ static int ndbcluster_init(void *p)
     h->alter_tablespace= ndbcluster_alter_tablespace;    /* Show status */
     h->partition_flags=  ndbcluster_partition_flags; /* Partition flags */
     h->alter_table_flags=ndbcluster_alter_table_flags; /* Alter table flags */
-    h->fill_files_table= ndbcluster_fill_files_table;
+    h->fill_is_table=    ndbcluster_fill_is_table;
 #ifdef HAVE_NDB_BINLOG
     ndbcluster_binlog_init_handlerton();
 #endif
@@ -7539,6 +7544,34 @@ ndbcluster_init_error:
   DBUG_RETURN(TRUE);
 }
 
+/**
+   Used to fill in INFORMATION_SCHEMA* tables.
+   
+   @param hton handle to the handlerton structure
+   @param thd the thread/connection descriptor
+   @param[in,out] tables the information schema table that is filled up
+   @param cond used for conditional pushdown to storage engine
+   @param schema_table_idx the table id that distinguishes the type of table
+   
+   @return Operation status
+ */
+static int ndbcluster_fill_is_table(handlerton *hton,
+                                      THD *thd,
+                                      TABLE_LIST *tables,
+                                      COND *cond,
+                                      enum enum_schema_tables schema_table_idx)
+{
+  int ret= 0;
+  
+  if (schema_table_idx == SCH_FILES)
+  {
+    ret= ndbcluster_fill_files_table(hton, thd, tables, cond);
+  }
+  
+  return ret;
+}
+
+
 static int ndbcluster_end(handlerton *hton, ha_panic_function type)
 {
   DBUG_ENTER("ndbcluster_end");

sql/handler.h

@@ -515,6 +515,46 @@ class st_alter_tablespace : public Sql_alloc
 /* The handler for a table type.  Will be included in the TABLE structure */
 
 struct TABLE;
+
+/*
+  Make sure that the order of schema_tables and enum_schema_tables are the same.
+*/
+enum enum_schema_tables
+{
+  SCH_CHARSETS= 0,
+  SCH_COLLATIONS,
+  SCH_COLLATION_CHARACTER_SET_APPLICABILITY,
+  SCH_COLUMNS,
+  SCH_COLUMN_PRIVILEGES,
+  SCH_ENGINES,
+  SCH_EVENTS,
+  SCH_FILES,
+  SCH_GLOBAL_STATUS,
+  SCH_GLOBAL_VARIABLES,
+  SCH_KEY_COLUMN_USAGE,
+  SCH_OPEN_TABLES,
+  SCH_PARTITIONS,
+  SCH_PLUGINS,
+  SCH_PROCESSLIST,
+  SCH_PROFILES,
+  SCH_REFERENTIAL_CONSTRAINTS,
+  SCH_PROCEDURES,
+  SCH_SCHEMATA,
+  SCH_SCHEMA_PRIVILEGES,
+  SCH_SESSION_STATUS,
+  SCH_SESSION_VARIABLES,
+  SCH_STATISTICS,
+  SCH_STATUS,
+  SCH_TABLES,
+  SCH_TABLE_CONSTRAINTS,
+  SCH_TABLE_NAMES,
+  SCH_TABLE_PRIVILEGES,
+  SCH_TRIGGERS,
+  SCH_USER_PRIVILEGES,
+  SCH_VARIABLES,
+  SCH_VIEWS
+};
+
 struct TABLE_SHARE;
 struct st_foreign_key_info;
 typedef struct st_foreign_key_info FOREIGN_KEY_INFO;
@@ -679,9 +719,9 @@ struct handlerton
    uint (*partition_flags)();
    uint (*alter_table_flags)(uint flags);
    int (*alter_tablespace)(handlerton *hton, THD *thd, st_alter_tablespace *ts_info);
-   int (*fill_files_table)(handlerton *hton, THD *thd,
-                           TABLE_LIST *tables,
-                           class Item *cond);
+   int (*fill_is_table)(handlerton *hton, THD *thd, TABLE_LIST *tables, 
+                        class Item *cond, 
+                        enum enum_schema_tables);
    uint32 flags;                                /* global handler flags */
    /*
       Those handlerton functions below are properly initialized at handler

sql/sql_show.cc

@@ -6264,8 +6264,9 @@ static my_bool run_hton_fill_schema_files(THD *thd, plugin_ref plugin,
   struct run_hton_fill_schema_files_args *args=
     (run_hton_fill_schema_files_args *) arg;
   handlerton *hton= plugin_data(plugin, handlerton *);
-  if(hton->fill_files_table && hton->state == SHOW_OPTION_YES)
-    hton->fill_files_table(hton, thd, args->tables, args->cond);
+  if (hton->fill_is_table && hton->state == SHOW_OPTION_YES)
+      hton->fill_is_table(hton, thd, args->tables, args->cond,
+            get_schema_table_idx(args->tables->schema_table));
   return false;
 }
 

sql/table.h

@@ -878,47 +878,6 @@ typedef struct st_foreign_key_info
   List<LEX_STRING> referenced_fields;
 } FOREIGN_KEY_INFO;
 
-/*
-  Make sure that the order of schema_tables and enum_schema_tables are the same.
-*/
-
-enum enum_schema_tables
-{
-  SCH_CHARSETS= 0,
-  SCH_COLLATIONS,
-  SCH_COLLATION_CHARACTER_SET_APPLICABILITY,
-  SCH_COLUMNS,
-  SCH_COLUMN_PRIVILEGES,
-  SCH_ENGINES,
-  SCH_EVENTS,
-  SCH_FILES,
-  SCH_GLOBAL_STATUS,
-  SCH_GLOBAL_VARIABLES,
-  SCH_KEY_COLUMN_USAGE,
-  SCH_OPEN_TABLES,
-  SCH_PARTITIONS,
-  SCH_PLUGINS,
-  SCH_PROCESSLIST,
-  SCH_PROFILES,
-  SCH_REFERENTIAL_CONSTRAINTS,
-  SCH_PROCEDURES,
-  SCH_SCHEMATA,
-  SCH_SCHEMA_PRIVILEGES,
-  SCH_SESSION_STATUS,
-  SCH_SESSION_VARIABLES,
-  SCH_STATISTICS,
-  SCH_STATUS,
-  SCH_TABLES,
-  SCH_TABLE_CONSTRAINTS,
-  SCH_TABLE_NAMES,
-  SCH_TABLE_PRIVILEGES,
-  SCH_TRIGGERS,
-  SCH_USER_PRIVILEGES,
-  SCH_VARIABLES,
-  SCH_VIEWS
-};
-
-
 #define MY_I_S_MAYBE_NULL 1
 #define MY_I_S_UNSIGNED   2