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DS-MRR improvements:

Browse Source 
- address the review feedback (class/var renames)
- fix wrong test result (bug in buffer refill logic)
This commit is contained in:
Sergey Petrunya
2010-10-28 20:48:16 +04:00
parent d8efc3b155
commit a88bd5cf56
2 changed files with 24 additions and 19 deletions
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27
sql/multi_range_read.cc
View File

@ -623,21 +623,26 @@ int Mrr_ordered_rndpos_reader::get_next(char **range_info)
while (1)
{
if (rowid_buffer->is_empty())
if (rowid_buffer->is_empty()) /* We're out of rowids */
{
/*
We're out of rowids. If there are still some sorted keys, use up them
first (that is, don't call re-fill for keys when we still have some).
*/
/* First, finish off the sorted keys we have */
if (!index_reader->eof())
{
if ((res= refill_buffer()))
return res; /* for fatal errors */
}
else
if (rowid_buffer->is_empty())
{
//TODO: here: redistribute the buffer space, then refill the index
//reader, then refill us.
/*
Ok neither index_reader nor us have any records. Refill index
reader, then refill us.
*/
// TODO: if key buffer is empty, too, redistribute the buffer space.
if ((res= index_reader->refill_buffer()) ||
(res= refill_buffer()))
return res;
}
}
@ -871,7 +876,7 @@ int DsMrr_impl::setup_two_handlers()
if (keyno == h->pushed_idx_cond_keyno)
pushed_cond= h->pushed_idx_cond;
Mrr_strategy *save_strategy= strategy;
Mrr_reader *save_strategy= strategy;
strategy= NULL;
/*
Caution: this call will invoke this->dsmrr_close(). Do not put the
@ -910,7 +915,7 @@ int DsMrr_impl::setup_two_handlers()
if (h->inited == handler::INDEX)
{
handler *save_h2= h2;
Mrr_strategy *save_strategy= strategy;
Mrr_reader *save_strategy= strategy;
h2= NULL;
strategy= NULL;
res= h->ha_index_end();
@ -919,7 +924,7 @@ int DsMrr_impl::setup_two_handlers()
if (res)
goto error;
}
if ((h->inited == handler::RND) && h->ha_rnd_init(FALSE))
if ((h->inited != handler::RND) && h->ha_rnd_init(FALSE))
goto error;
}
DBUG_RETURN(0);

14
sql/multi_range_read.h
View File

@ -130,18 +130,18 @@ public:
been reached and get_next() must not be called anymore.
*/
class Mrr_strategy
class Mrr_reader
{
public:
virtual int get_next(char **range_info) = 0;
virtual int refill_buffer()=0;
virtual ~Mrr_strategy() {};
virtual ~Mrr_reader() {}; /* just to remove compiler warning */
};
/* A common base for strategies that do index scans and produce index tuples */
class Mrr_index_reader : public Mrr_strategy
class Mrr_index_reader : public Mrr_reader
{
public:
handler *h;
@ -241,7 +241,7 @@ private:
/* MRR strategy that fetches rowids */
class Mrr_ordered_rndpos_reader : public Mrr_strategy
class Mrr_ordered_rndpos_reader : public Mrr_reader
{
public:
int init(handler *h, Mrr_index_reader *index_reader, uint mode,
@ -271,7 +271,7 @@ private:
uchar *rowids_range_id;
};
class Mrr_strategy_factory
class Mrr_reader_factory
{
public:
Mrr_ordered_rndpos_reader ordered_rndpos_reader;
@ -458,8 +458,8 @@ private:
/* TRUE <=> sort rowids and use rnd_pos() to get and return full records */
//bool do_rndpos_scan;
Mrr_strategy_factory strategy_factory;
Mrr_strategy *strategy;
Mrr_reader_factory strategy_factory;
Mrr_reader *strategy;
Mrr_index_reader *index_strategy;
/* The whole buffer space that we're using */