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#define is_schema_db(X) \
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!my_strcasecmp(system_charset_info, INFORMATION_SCHEMA_NAME.str, (X))
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bool mysql_ha_read(Session *, TableList *,enum enum_ha_read_modes,char *,
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List<Item> *,enum ha_rkey_function,Item *,ha_rows,ha_rows);
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#define TMP_TABLE_KEY_EXTRA 8
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void set_item_name(Item *item,char *pos,uint32_t length);