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Fix for BUG#10244:

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Make get_quick_select_for_ref() accept estimated # records as parameter and 
set QUICK_RANGE_SELECT::records, as this value is used to allocate buffers 
in Multi-Range Read.
This commit is contained in:
sergefp@mysql.com
2005-04-29 01:16:32 +04:00
parent 254bb2570c
commit a7a1d4dc1e
3 changed files with 25 additions and 9 deletions
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25
sql/opt_range.cc
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@ -5513,14 +5513,26 @@ bool QUICK_ROR_UNION_SELECT::check_if_keys_used(List<Item> *fields)
}
/****************************************************************************
Create a QUICK RANGE based on a key
This allocates things in a new memory root, as this may be called many times
during a query.
****************************************************************************/
/*
Create quick select from ref/ref_or_null scan.
SYNOPSIS
get_quick_select_for_ref()
thd Thread handle
table Table to access
ref ref[_or_null] scan parameters
records Estimate of number of records (needed only to construct
quick select)
NOTES
This allocates things in a new memory root, as this may be called many
times during a query.
RETURN
Quick select that retrieves the same rows as passed ref scan
NULL on error.
*/
QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
TABLE_REF *ref)
TABLE_REF *ref, ha_rows records)
{
MEM_ROOT *old_root= thd->mem_root;
/* The following call may change thd->mem_root */
@ -5537,6 +5549,7 @@ QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
delete quick;
goto err;
}
quick->records= records;
if (cp_buffer_from_ref(thd,ref) && thd->is_fatal_error ||
!(range= new QUICK_RANGE()))