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Fixed core dump bug in ORDER BY ... LIMIT

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Docs/manual.texi:
  Changelog
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unknown
2002-09-15 01:23:01 +03:00
parent 6a06c4c534
commit 20ec6183fe
2 changed files with 9 additions and 2 deletions
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2
Docs/manual.texi
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@@ -46929,6 +46929,8 @@ not yet 100% confident in this code.
@appendixsubsec Changes in release 3.23.53
@itemize @bullet
@item
Fixed unlikely core dump with @code{SELECT ... ORDER BY ... LIMIT}.
@item
Changed @code{AND/OR} to report that they can return NULL. This fixes a
bug in @code{GROUP BY} on @code{AND/OR} expression that return
@code{NULL}.

9
sql/filesort.cc
View File

@@ -378,13 +378,18 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
if (indexpos >= *maxbuffer ||
write_keys(param,sort_keys,idx,buffpek+indexpos,tempfile))
DBUG_RETURN(HA_POS_ERROR);
idx=0; indexpos++;
idx=0;
if (param->ref_length == param->sort_length &&
my_b_tell(tempfile)/param->sort_length >= param->max_rows)
{
/*
We are writing the result index file and have found all
rows that we need. Abort the sort and return the result.
*/
error=HA_ERR_END_OF_FILE;
break; /* Found enough records */
}
indexpos++;
}
make_sortkey(param,sort_keys[idx++],ref_pos);
}
@@ -399,7 +404,7 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
file->print_error(error,MYF(ME_ERROR | ME_WAITTANG)); /* purecov: inspected */
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
}
if (indexpos)
if (indexpos && idx)
if (indexpos >= *maxbuffer ||
write_keys(param,sort_keys,idx,buffpek+indexpos,tempfile))
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */