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table resolution". Added members to Item_ident for storing original db, table and field names since those that set later from Field have shorter life-time than required by prep. stmt. So we need to restore original names in Item_ident::cleanup(). Also now using special construnctor for creation of Item_field from Field object that ensures that table and field name have big enough life-time. "Fix" for bug #2050 "10 to 1 performance drop with server 4.1.1" Clean ups in implementation of caching of field number in table. Added caching of table in which field is found in find_field_in_tables(). sql/item.cc: Added members to Item_ident for storing original db, table and field names since those that set later from Field have shorter life-time than required by prep. stmt. So we need to restore original names in Item_ident::cleanup(). Added Item_ident::cached_table for caching table there we found our field. Added special constructor for creation of Item_field from Field object that ensures that table and field name have big enough life-time. sql/item.h: Added members to Item_ident for storing original db, table and field names since those that set later from Field have shorter life-time than required by prep. stmt. So we need to restore original names in Item_ident::cleanup(). Changed type of Item_ident::cached_field_index from int to uint (and so NO_CACHED_FIELD_INDEX is UINT_MAX now) because we want to save one comparison in find_field_in_table(). Added Item_ident::cached_table for caching table there we found our field. Added special constructor for creation of Item_field from Field object that ensures that table and field name have big enough life-time. sql/mysql_priv.h: Changed type of cached_field_index_ptr from int* to uint* (and so NO_CACHED_FIELD_INDEX is UINT_MAX now) because we want to save one comparison in find_field_in_table(). sql/sql_acl.cc: Changed type of find_field_in_table() paremeter to make it faster. sql/sql_base.cc: find_field_in_table(): small optimization and soime clean ups in caching of field index. find_field_in_tables(): added aggresive caching of table in which field is found in Item_ident::cached_table. insert_fields(): using special construnctor for creation of Item_field from Field object that ensures that table and field name have big enough life-time.
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