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Fix for BUG#5117:

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* Renamed handler::estimate_number_of_rows to handler::estimate_rows_upper_bound function, which can also return "unknown"
 * made filesort to use full sort buffer if number of rows to sort is not known.
This commit is contained in:
sergefp@mysql.com
2004-09-13 06:14:25 +04:00
parent 0afcaac5a8
commit 13fdbc99cf
7 changed files with 102 additions and 15 deletions
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10
sql/handler.h
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@ -300,7 +300,15 @@ public:
virtual const key_map *keys_to_use_for_scanning() { return &key_map_empty; }
virtual bool has_transactions(){ return 0;}
virtual uint extra_rec_buf_length() { return 0; }
virtual ha_rows estimate_number_of_rows() { return records+EXTRA_RECORDS; }
/*
Return upper bound of current number of records in the table
(max. of how many records one will retrieve when doing a full table scan)
If upper bound is not known, HA_POS_ERROR should be returned as a max
possible upper bound.
*/
virtual ha_rows estimate_rows_upper_bound()
{ return records+EXTRA_RECORDS; }
virtual const char *index_type(uint key_number) { DBUG_ASSERT(0); return "";}