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MDEV-7068: MRR accessing uninitialised bytes, test case failure main.innodb_mrr

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- Don't call index_reader->interrupt_read() if the
  index reader has returned all rows that matched its keys.
This commit is contained in:
Sergey Petrunya 2014-11-13 13:56:35 +03:00
parent 8c7ef99bb2
commit 06c7f493e3
1 changed files with 13 additions and 2 deletions
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15
sql/multi_range_read.cc
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@ -684,8 +684,19 @@ int Mrr_ordered_rndpos_reader::refill_from_index_reader()
rowid_buffer->write_ptr2= (uchar*)&range_info;
rowid_buffer->write();
}
index_reader->interrupt_read();
/*
When index_reader_needs_refill=TRUE, this means we've got all of index
tuples for lookups keys that index_reader had. We are not in the middle
of an index read, so there is no need to call interrupt_read.
Actually, we must not call interrupt_read(), because it could be that we
haven't read a single row (because all index lookups returned
HA_ERR_KEY_NOT_FOUND). In this case, interrupt_read() will cause [harmless]
valgrind warnings when trying to save garbage from table->record[0].
*/
if (!index_reader_needs_refill)
index_reader->interrupt_read();
/* Sort the buffer contents by rowid */
rowid_buffer->sort((qsort2_cmp)rowid_cmp_reverse, (void*)file);