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Merge in Monty's rename patch.

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drizzled/sql_update.cc
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  Process usual UPDATE
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  SYNOPSIS
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    mysql_update()
 
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    update_query()
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    session                     thread handler
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    fields              fields for update
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    values              values of fields for update
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    1  - error
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*/
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int mysql_update(Session *session, TableList *table_list,
 
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int update_query(Session *session, TableList *table_list,
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                 List<Item> &fields, List<Item> &values, COND *conds,
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                 uint32_t order_num, Order *order,
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                 ha_rows limit, enum enum_duplicates,
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  table->covering_keys= table->getShare()->keys_in_use;
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  table->quick_keys.reset();
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  if (mysql_prepare_update(session, table_list, &conds, order_num, order))
 
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  if (prepare_update(session, table_list, &conds, order_num, order))
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  {
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    DRIZZLE_UPDATE_DONE(1, 0, 0);
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    return 1;
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  Prepare items in UPDATE statement
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  SYNOPSIS
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    mysql_prepare_update()
 
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    prepare_update()
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    session                     - thread handler
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    table_list          - global/local table list
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    conds               - conditions
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    false OK
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    true  error
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*/
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bool mysql_prepare_update(Session *session, TableList *table_list,
 
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bool prepare_update(Session *session, TableList *table_list,
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                         Item **conds, uint32_t order_num, Order *order)
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{
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  List<Item> all_fields;