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Bug#55626: MIN and MAX reading a delete-marked record from secondary index

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Remove a bogus debug assertion that triggered the bug.
Add assertions precisely where records must not be delete-marked.
And a comment to clarify when the record is allowed to be delete-marked.
This commit is contained in:
Marko Mäkelä 2010-08-18 14:01:10 +03:00
commit d3a7ef9913
1 changed files with 12 additions and 3 deletions
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15
storage/innodb_plugin/row/row0sel.c
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@ -2690,7 +2690,6 @@ row_sel_store_mysql_rec(
ut_ad(prebuilt->mysql_template);
ut_ad(prebuilt->default_rec);
ut_ad(rec_offs_validate(rec, NULL, offsets));
ut_ad(!rec_get_deleted_flag(rec, rec_offs_comp(offsets)));
if (UNIV_LIKELY_NULL(prebuilt->blob_heap)) {
mem_heap_free(prebuilt->blob_heap);
@ -3611,6 +3610,7 @@ row_search_for_mysql(
row_sel_try_search_shortcut_for_mysql().
The latch will not be released until
mtr_commit(&mtr). */
ut_ad(!rec_get_deleted_flag(rec, comp));
if (!row_sel_store_mysql_rec(buf, prebuilt,
rec, offsets)) {
@ -4238,7 +4238,7 @@ no_gap_lock:
rec = old_vers;
}
} else if (!lock_sec_rec_cons_read_sees(rec, trx->read_view)) {
} else {
/* We are looking into a non-clustered index,
and to get the right version of the record we
have to look also into the clustered index: this
@ -4246,8 +4246,12 @@ no_gap_lock:
information via the clustered index record. */
ut_ad(index != clust_index);
ut_ad(!dict_index_is_clust(index));
goto requires_clust_rec;
if (!lock_sec_rec_cons_read_sees(
rec, trx->read_view)) {
goto requires_clust_rec;
}
}
}
@ -4370,8 +4374,13 @@ requires_clust_rec:
ULINT_UNDEFINED, &heap);
result_rec = rec;
}
/* result_rec can legitimately be delete-marked
now that it has been established that it points to a
clustered index record that exists in the read view. */
} else {
result_rec = rec;
ut_ad(!rec_get_deleted_flag(rec, comp));
}
/* We found a qualifying record 'result_rec'. At this point,