bugfix: remove broken insert t values () optimization

* wrong results for 5.7 and 10.1- vcols, and for indexed vcols
* only helps in rare cases and only minimally

Author: vuvova

sql/sql_base.cc

@@ -7762,7 +7762,6 @@ fill_record(THD *thd, TABLE *table_arg, List<Item> &fields, List<Item> &values,
   List_iterator_fast<Item> f(fields),v(values);
   Item *value, *fld;
   Item_field *field;
-  TABLE *vcol_table= 0;
   bool save_abort_on_warning= thd->abort_on_warning;
   bool save_no_errors= thd->no_errors;
   DBUG_ENTER("fill_record");
@@ -7788,8 +7787,6 @@ fill_record(THD *thd, TABLE *table_arg, List<Item> &fields, List<Item> &values,
     table_arg->auto_increment_field_not_null= FALSE;
     f.rewind();
   }
-  else
-    vcol_table= thd->lex->unit.insert_table_with_stored_vcol;
 
   while ((fld= f++))
   {
@@ -7822,17 +7819,15 @@ fill_record(THD *thd, TABLE *table_arg, List<Item> &fields, List<Item> &values,
       goto err;
     }
     rfield->set_explicit_default(value);
-    DBUG_ASSERT(vcol_table == 0 || vcol_table == table);
-    vcol_table= table;
   }
 
   if (!update && table_arg->default_field &&
       table_arg->update_default_fields(0, ignore_errors))
     goto err;
   /* Update virtual fields */
   thd->abort_on_warning= FALSE;
-  if (vcol_table && vcol_table->vfield &&
-      vcol_table->update_virtual_fields(VCOL_UPDATE_FOR_WRITE))
+  if (table_arg->vfield &&
+      table_arg->update_virtual_fields(VCOL_UPDATE_FOR_WRITE))
     goto err;
   thd->abort_on_warning= save_abort_on_warning;
   thd->no_errors=        save_no_errors;

sql/sql_insert.cc

@@ -1522,8 +1522,6 @@ bool mysql_prepare_insert(THD *thd, TABLE_LIST *table_list,
 
   if (!table)
     table= table_list->table;
-  if (table->s->has_virtual_stored_fields)
-    thd->lex->unit.insert_table_with_stored_vcol= table;
 
   if (!select_insert)
   {

sql/sql_lex.cc

@@ -2074,7 +2074,6 @@ void st_select_lex_unit::init_query()
   item_list.empty();
   describe= 0;
   found_rows_for_union= 0;
-  insert_table_with_stored_vcol= 0;
   derived= 0;
   is_view= false;
   with_clause= 0;

sql/sql_lex.h

@@ -682,13 +682,6 @@ class st_select_lex_unit: public st_select_lex_node {
   bool describe; /* union exec() called for EXPLAIN */
   Procedure *last_procedure;	 /* Pointer to procedure, if such exists */
 
-  /* 
-    Insert table with stored virtual columns.
-    This is used only in those rare cases 
-    when the list of inserted values is empty.
-  */
-  TABLE *insert_table_with_stored_vcol;
-
   bool columns_are_renamed;
 
   void init_query();

sql/sql_load.cc

@@ -410,8 +410,6 @@ int mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
 
   table->prepare_triggers_for_insert_stmt_or_event();
   table->mark_columns_needed_for_insert();
-  if (table->s->has_virtual_stored_fields)
-    thd->lex->unit.insert_table_with_stored_vcol= table;
 
   uint tot_length=0;
   bool use_blobs= 0, use_vars= 0;

sql/table.cc

@@ -2231,7 +2231,6 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
         DBUG_ASSERT(!reg_field->vcol_info);
         reg_field->vcol_info= vcol_info;
         share->virtual_fields++;
-        share->has_virtual_stored_fields=true;  // For insert/load data
         break;
       case 2:                                   // Default expression
         vcol_info->stored_in_db= 1;

sql/table.h

@@ -685,7 +685,6 @@ struct TABLE_SHARE
   bool table_creation_was_logged;
   bool non_determinstic_insert;
   bool vcols_need_refixing;
-  bool has_virtual_stored_fields;
   bool check_set_initialized;
   bool has_update_default_function;
   ulong table_map_id;                   /* for row-based replication */