cleanup: find_field_in_table()

don't duplicate functionality, use TABLE::find_field_by_name()

also, set cached_field_index_ptr for _rowid field

sql/sql_base.cc

@@ -5628,7 +5628,7 @@ Field *
 find_field_in_table(THD *thd, TABLE *table, const char *name, size_t length,
                     bool allow_rowid, uint *cached_field_index_ptr)
 {
-  Field **field_ptr, *field;
+  Field *field;
   uint cached_field_index= *cached_field_index_ptr;
   DBUG_ENTER("find_field_in_table");
   DBUG_PRINT("enter", ("table: '%s', field name: '%s'", table->alias.c_ptr(),
@@ -5638,38 +5638,18 @@ find_field_in_table(THD *thd, TABLE *table, const char *name, size_t length,
   if (cached_field_index < table->s->fields &&
       !my_strcasecmp(system_charset_info,
                      table->field[cached_field_index]->field_name.str, name))
-    field_ptr= table->field + cached_field_index;
-  else if (table->s->name_hash.records)
-  {
-    field_ptr= (Field**) my_hash_search(&table->s->name_hash, (uchar*) name,
-                                        length);
-    if (field_ptr)
-    {
-      /*
-        field_ptr points to field in TABLE_SHARE. Convert it to the matching
-        field in table
-      */
-      field_ptr= (table->field + (field_ptr - table->s->field));
-    }
-  }
+    field= table->field[cached_field_index];
   else
   {
-    if (!(field_ptr= table->field))
-      DBUG_RETURN((Field *)0);
-    for (; *field_ptr; ++field_ptr)
-      if (!my_strcasecmp(system_charset_info, (*field_ptr)->field_name.str,
-                         name))
-        break;
+    LEX_CSTRING fname= {name, length};
+    field= table->find_field_by_name(&fname);
   }
 
-  if (field_ptr && *field_ptr)
+  if (field)
   {
-    if ((*field_ptr)->invisible == INVISIBLE_FULL &&
+    if (field->invisible == INVISIBLE_FULL &&
         DBUG_EVALUATE_IF("test_completely_invisible", 0, 1))
       DBUG_RETURN((Field*)0);
-
-    *cached_field_index_ptr= (uint)(field_ptr - table->field);
-    field= *field_ptr;
   }
   else
   {
@@ -5679,6 +5659,7 @@ find_field_in_table(THD *thd, TABLE *table, const char *name, size_t length,
       DBUG_RETURN((Field*) 0);
     field= table->field[table->s->rowid_field_offset-1];
   }
+  *cached_field_index_ptr= field->field_index;
 
   update_field_dependencies(thd, field, table);