Zardosht Kasheff <[email protected]> writes:
> What I do not understand is this. Why does the following code at line
> 4734 of ha_partition.cc (at the bottom of this message) simply assume
> that if file->stats.records is 0, that it can blindly return
> HA_ERR_END_OF_FILE? I understand if file->ha_table_flags exposes
> HA_STATS_RECORDS_IS_EXACT, that it can do this, but that is not
> checked here.
>From sql/handler.h:
class ha_statistics
{
...
/*
The number of records in the table.
0 - means the table has exactly 0 rows
other - if (table_flags() & HA_STATS_RECORDS_IS_EXACT)
the value is the exact number of records in the table
else
it is an estimate
*/
ha_rows records;
So 0 is special, and must not be given as an estimate, according to this
comment (which is also in MySQL 5.1).
- Kristian.
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