For some reason, GCC 4.2.1 ignores casts (for removing constness)
in calls to inline functions.

page_align(), ut_align_down(): Make the parameter const void*, but still
return a non-const pointer.  This is ugly, but these functions cannot be
replaced with a const-preserving macro in a portable way, given that
the pointer argument is not always pointing to bytes.

buf_block_get_page_zip(): Implement as a const-preserving macro.

buf_frame_get_page_zip(), buf_block_align(): Add const qualifiers.

lock_rec_get_prev(): Silence GCC 4.2.1 warnings.

mlog_write_initial_log_record(), mlog_write_initial_log_record_fast(),
mtr_memo_contains(): Add const qualifier to the pointer.

page_header_get_ptr(): Rewrite as page_header_get_offs(), and
implement as a macro that calls this function.

buf_block_hash_get(): New function, similar to buf_page_hash_get().

buf_page_get_block(): Remove the const qualifiers.  This is a low-level
function, and the operations on block->mutex are non-const.

buf_page_try_get_func(): Implement with lower-level predicates, somewhat
similar to buf_page_get_known_nowait().

lock_rec_print(): Remove the unused variable zip_size and the
call to fil_space_get_zip_size().  Adapt to buf_page_try_get() returning
a const pointer.

buf_block_fix_inc(), and use it.

Remove bogus comment from ha_storage_empty().

Add const qualifier to the value returned by ha_storage_put().
It must not be changed as this will invalidate the hash.

from buf_page_t* to buf_block_t*.

buf_page_can_relocate(): Replace the incorrect __attribute__((const))
with __attribute__((pure)).

ha_innobase::update_thd(void): New function, to call the inline function
ha_innobase::update_thd(THD*).

check_trx_exists(): Make static.  handler0alter.cc does not need to call
this function.

offsets_[] arrays, as suggested by Vasil.

rec_offs_set_n_alloc(): Declare as a public function.  Assert that
n_alloc > REC_OFFS_HEADER_SIZE.

rec_offs_get_n_alloc(): Assert that n_alloc > REC_OFFS_HEADER_SIZE.

the sync_thread_levels_g() check, so that it will be easier to add
new sync levels.

Fix compilation warning:

can_cache_be_updated(): Remove const qualifier because this function needs
to call rw_lock_own().

with "col" in two debug assertions.  This mistake was made in r1910.

Fix a warning produced when UNIV_DEBUG is defined.

Move part of the code from lock_rec_print() in a separate function
buf_page_try_get() because the same functionality is needed in
INFORMATION SCHEMA code.

Approved by:	Heikki

Add auxiliary function lock_rec_get_index() to retrieve the index on
which the lock is.

Approved by:	Heikki

Fix a bug where the condition (prtype & DATA_ROW_ID) is unexpectedly
always false becasue DATA_ROW_ID is 0.

Use a switch instead of if-else in order to avoid repeating
(prtype & DATA_SYS_PRTYPE_MASK).

Approved by:	Heikki

innobase_col_to_mysql(): New function, adapted from
row_sel_field_store_in_mysql_format().

innobase_rec_to_mysql(): Correct the function comment, which was still
saying "clustered index record", although we can convert any record.
Make use of innobase_col_to_mysql().  Always call field->reset(),
so that innobase_col_to_mysql() will not have to pad anything.

"data" from byte* to const void*.

if-else with switch.

Since r1905, innobase_rec_to_mysql() does not require a clustered index record.

row_merge_dup_t: Remove old_table.

row_merge_dup_report(): Do not fetch the clustered index record.  Simply
convert the tuple by innobase_rec_to_mysql().

row_merge_blocks(), row_merge(), row_merge_sort(): Add a TABLE* parameter
for reporting duplicate key values during file sort.

row_merge_read_clustered_index(): Replace UNIV_PAGE_SIZE with the more
appropriate sizeof(mrec_buf_t).

clustered or secondary.  Remove the rec_offs_validate() assertion, because
the function may be passed a mrec_t* that would fail the check.

This should have been done in r1903, where the minimum size of
row_merge_block_t was noted to be UNIV_PAGE_SIZE.

row_merge_buf_add(): Add ut_ad(data_size < sizeof(row_merge_block_t))
and document why it may fail if sizeof row_merge_block_t < UNIV_PAGE_SIZE.

row_merge_dup_report(): Do not call innobase_rec_reset().

dtuple_create_for_mysql(), dtuple_free_for_mysql(): Remove.

ha_innobase::records_in_range(): Use mem_heap_create(), mem_heap_free(),
and dtuple_create() instead of the removed functions above.  Since r1587,
InnoDB C++ functions can invoke inlined C functions.

innobase_rec_to_mysql(): New function, for converting an InnoDB clustered
index record to MySQL table->record[0].  TODO: convert integer fields.
Currently, integer fields are in big-endian byte order instead of
host byte order, and signed integer fields are offset by 0x80000000.

innobase_rec_reset(): New function, for resetting table->record[0].

row_merge_build_indexes(): Add the parameter TABLE* table (the MySQL table
handle) for reporting duplicate key values.

dtuple_from_fields(): New function, to convert an array of dfield_t* to
dtuple_t.

dtuple_get_n_ext(): New function, to compute the number of externally stored
fields.

row_merge_dup_t: Structure for counting and reporting duplicate records.

row_merge_dup_report(): Function for counting and reporting duplicate records.

row_merge_tuple_cmp(), row_merge_tuple_sort(): Replace the ulint* n_dup
parameter with row_merge_dup_t* dup.

row_merge_buf_sort(): Add the parameter row_merge_dup_t* dup, which is
NULL when sorting a non-unique index.

row_merge_buf_write(), row_merge_heap_create(), row_merge_read_rec(),
row_merge_cmp(), row_merge_read_clustered_index(), row_merge_blocks(),
row_merge(), row_merge_sort(): Add const qualifiers.

row_merge_read_clustered_index(): Use a common error handling branch err_exit.
Invoke row_merge_buf_sort() differently on unique indexes.

row_merge_blocks(): note TODO: We could invoke innobase_rec_to_mysql()
to report duplicate key values when creating a clustered index.

dict_find_index_by_max_id(): Rename this static function to its
only caller, dict_table_get_index_by_max_id().

dict_table_get_index_by_max_id(): Copy the function comment from
dict_find_index_by_max_id().

rec_get_converted_size_comp(), rec_convert_dtuple_to_rec_comp(),
rec_convert_dtuple_to_rec_new(), rec_convert_dtuple_to_rec(): Add a
const qualifier to dict_index_t*.

row_search_on_row_ref(): Add const qualifiers to the dict_table_t*
and dtuple_t* parameters.  Note that pcur is an "out" parameter
and mtr is "in/out".

row_build_row_ref_fast(): Note that "ref" is an in/out parameter.

row_build_row_ref_from_row(): Add const qualifiers to all "in" parameters.

dtuple_create(): Simplify a pointer expression.  Flag the fields uninitialized
after initializing them in the debug version.

dtuple_t: Only declare magic_n if UNIV_DEBUG is defined.  The field is
not assigned to nor tested unless UNIV_DEBUG is defined.

to avoid a rec_get_offsets() call.  Add some const qualifiers.

row_sel_get_clust_rec_for_mysql(): Note that "offsets" will also be
an input parameter.

dict_index_t* and dict_table_t* parameters of some functions.