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Bug#44337 Select query using index merge fails with MCH3601

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The storage engine was not correctly handling the case in 
which rnd_pos is executed for a handler without a preceding
rnd_next or index read operation. As a result, an unitialized
file handle was sometimes being passed to the QMY_READ API.

The fix clears the rrnAssocHandle at the beginning of each
read operation and then checks to see whether it has been
set to a valid handle value before attempting to use it
in rnd_pos. If rrnAssocHandle has not been set by a previous
read operation, rnd_pos instead falls back to the use of the
currently active handle.
This commit is contained in:
Narayanan V 2009-04-29 16:51:14 +05:30
parent 4edc43b7b8
commit f51e62cfa3
1 changed files with 6 additions and 1 deletions
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7
storage/ibmdb2i/ha_ibmdb2i.cc
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@ -898,6 +898,8 @@ int ha_ibmdb2i::index_init(uint idx, bool sorted)
releaseIndexFile(idx);
}
rrnAssocHandle= 0;
DBUG_RETURN(rc);
}
@ -1154,6 +1156,8 @@ int ha_ibmdb2i::rnd_init(bool scan)
releaseDataFile();
}
rrnAssocHandle= 0;
DBUG_RETURN(0); // MySQL sometimes does not check the return code, causing
// an assert in ha_rnd_end later on if we return a non-zero
// value here.
@ -1251,7 +1255,8 @@ int ha_ibmdb2i::rnd_pos(uchar * buf, uchar *pos)
int rc = 0;
if (activeHandle != rrnAssocHandle)
if (rrnAssocHandle &&
(activeHandle != rrnAssocHandle))
{
if (activeHandle) releaseActiveHandle();
rc = useFileByHandle(QMY_UPDATABLE, rrnAssocHandle);