We are trying to sort a lot of text/blob fields,
so the buffer is indeed too small.
Memory available = thd->variables.sortbuff_size = 262144
min_sort_memory = param.sort_length*MERGEBUFF2 = 292245
So the decision to abort the query is correct.
filesort() calls my_error(), the error is reported.
But, since we have DELETE IGNORE ... the error is converted to a warning by
THD::raise_condition
filesort currently expects an error to be recorded in the THD diagnostics
area.
If we lift this restriction (remove the assert) we end up in the familiar
void Protocol::end_statement()
default:
DBUG_ASSERT(0);
The solution seems to be to call my_error(ME_FATALERROR) in filesort,
so that the error is propagated as an error rather than a warning.
Write an additional warning message to the server log,
explaining why a sort operation is aborted.
The output in mysqld.err will look something like:
110127 15:07:54 [ERROR] mysqld: Sort aborted: Out of memory (Needed 24 bytes)
110127 15:07:54 [ERROR] mysqld: Out of sort memory, consider increasing server sort buffer size
110127 15:07:54 [ERROR] mysqld: Sort aborted: Out of sort memory, consider increasing server sort buffer size
110127 15:07:54 [ERROR] mysqld: Sort aborted: Incorrect number of arguments for FUNCTION test.f1; expected 0, got 1
If --log-warn=2 is enabled, we output information about host/user/query as well.
