row_merge_read_clustered_index(): Simplify the loop that scans the
clustered index.

otherwise like INNODB_ZIP, but resets the cumulated counts.

Rename innodb_buddy to innodb_zip in some comments.

innobase_stat_zip_fill(): Add parameter "reset".  Document the race condition
with the compression statistics counters.

trx_undo_report_row_operation(), trx_undo_report_dict_operation():
Reduce the scope of some variables.  Move the return(DB_SUCCESS)
case inside the for loop.

overflow.

Replace row0merge.h with row0mysql.h.

Remove redundant test trx->dict_operation_lock_mode == 0.
Fix typos in comments.

row_undo_ins(): Make the function more similar to the one in trunk.

exactly.  Rename the local variable "ulint level" to "ibool leaf".
Document that if the function returns DB_SUCCESS on a compressed page that
is covered by the insert buffer, the mini-transaction must be committed
before latching any further pages.  Verify that this is the case on all
execution paths.

the insert buffer bitmap.

ibuf_set_free_bits_func(): Never disable redo logging.

ibuf_update_free_bits_zip(): Remove.

btr_page_reorganize_low(), page_zip_reorganize(): Do not update the insert
buffer bitmap.  Instead, document that callers will have to take care of it,
and adapt the callers.

btr_compress(): On error, reset the insert buffer free bits.

btr_cur_insert_if_possible(): Do not modify the insert buffer bitmap.

btr_compress(), btr_cur_optimistic_insert(): On compressed pages,
reset the insert buffer bitmap.  Document why.

btr_cur_update_alloc_zip(): Document why it is necessary and sufficient
to reset the insert buffer free bits.

btr_cur_update_in_place(), btr_cur_optimistic_update(),
btr_cur_pessimistic_update(): Update the free bits in the same
mini-transaction.  Document that the mini-transaction must be
committed before latching any further pages.  Verify that this
is the case in all execution paths.

row_ins_sec_index_entry_by_modify(), row_ins_clust_index_entry_by_modify(),
row_undo_mod_clust_low(): Because these functions call
btr_cur_update_in_place(), btr_cur_optimistic_update(), or
btr_cur_pessimistic_update(), document that the mini-transaction must be
committed before latching any further pages.  Verify that this is the case
in all execution paths.

page_cur_tuple_insert(), page_cur_rec_insert(): Improve the documentation.
Note that the physical position of page_cursor may change.

page_cur_rec_insert(), page_cur_insert_rec_low(), page_cur_insert_rec_zip():
Add a const qualifier to the parameter rec.

Remove mysql.patch, because the configuration parameter interface has changed.

mtr_commit(): Do not acquire the log mutex if no log records are to be written.

ibuf_set_free_bits_func(): Do not clear mtr.modifications, because that would
prevent the dirty insert buffer bitmap block from being moved to the flush
list.  Instead, assume that mtr_commit() will not acquire log_sys->mutex
because redo logging is disabled.

buf_page_init_for_read(): I/O-fix the block before buf_buddy_alloc(), because
the newly allocated block could otherwise be reused by the compressed page.

the pages be decompressed.

buf_read_page_low(), buf_page_init_for_read(): Add parameter "unzip".

crash recovery is in progress.  This avoids a hang when
btr_parse_page_reorganize(), called from an I/O handler thread,
attempts to acquire log_sys->mutex while it is being held by
the main thread (the one that runs innobase_init()).  This change
was committed accidentally.  It may be unsafe to clear
mtr.modifications, because buf_page_release() at mtr_commit() may
forget to put modified pages to the flush list.

Cleanup: Remove the "type" parameter from many ibuf functions.
Let the caller check that !dict_index_is_clust().  This should avoid
function calls and register spilling.

ibuf_set_free_bits_func(), ibuf_set_free_bits(): Remove the parameter "type".

ibuf_reset_free_bits_with_type(): Rename to ibuf_reset_free_bits().
Remove the parameter "type".

ibuf_update_free_bits_if_full(), ibuf_update_free_bits_zip(),
ibuf_update_free_bits_low(), ibuf_update_free_bits_for_two_pages_low():
Remove the parameter "index".

log_write_up_to(): Replace if-else if-else with a switch block.

log_archive_do(): Remove an excess mutex_enter().  Replace if-else if-else
with a switch block.  (This function is not included unless UNIV_LOG_ARCHIVE
is defined.)

pass the compressed page size) with KEY_BLOCK_SIZE.

to the switch (row_merge_cmp(...)) to eliminate bogus warning about
uninitialized variable tmp.

was broken in one of the earlier cleanups.

row_merge_block_merge(): Remove the variable "selected".  Clear the record
count of new_block1 and new_block2.  Anticipate the right return values
from row_merge_cmp().

Add __attribute__((const)) or __attribute__((pure)) to various
mach_read functions.

dtype_new_read_for_order_and_null_size(): Remove a statement
without effect: mach_read_from_2(buf + 4).

in r1445.  They are needed after all, but apparently the tests do not
actually verify that the records are sorted.  (Also, a buffer overflow
will occur in index_merge_innodb.test if MERGE_BLOCK_SIZE is made smaller.)

Correct the language of some comments.  Eliminate the local variables
"num_of_merges" (renamed to "sorted" in one function).

cmp_rec_rec_with_match(): Initialize ret=0.  Remove assignments ret=0.

rec_init_offsets(): Remove bogus comment.

dict_index_is_unique(): New function.

row_merge_rec_fits_to_block(), row_merge_store_rec_to_block():
Add const qualifiers to rec, offsets.

row_merge_select(): Rename to row_merge_cmp(), simplify the interface.

row_merge_sort_linked_list(): Change the return type to ibool.
Replace sec_offs1,sec_offs2 with offsets1,offsets2.  Replace offset_heap
with heap.  Define a func_exit label.

row_merge_block_merge(): Reduce the scope of rec_offsets.

merge_rec_list_t: Define n_records only #ifdef UNIV_DEBUG.

row_merge_dict_table_get_index(): Add function comment.
Use inlined versions of mem_alloc() and mem_free().

and os_file_write(), and return DB_CORRUPTION when they fail.  Minor cleanup.

row_mege_insert_index_tuples(): Use a shared heap for dtuple and rec.
Use fewer gotos.

row_merge_sort_linked_list_in_disk(): Free the merge blocks at error exit.

row_merge_read(), row_merge_write(): Add UNIV_LIKELY hints.

row_merge_sort_linked_list_in_disk(): Reduce the scope of many variables.
Eliminate the variable "selected".

Replace byte offsets of type dulint with block offsets of type ulint.
Avoid references to MERGE_BLOCK_SIZE.

Improve the language of some comments.

row_merge_insert_index_tuples(), row_merge_sort_linked_list_in_disk():
Make the offset a ulint.

row_merge_read(), row_merge_write(): Helper functions.  Return the
status of os_file_read() and os_file_write().  TO DO: check the status
in the callers.

innobase_create_temporary_tablename(): Add static qualifier.  Allocate
the memory from heap.  Return a fixed identifier.

ha_innobase::add_index(): Allocate all memory from a single heap.
Simplify error handling.  Use a fixed prefix for temporary table names,
because only one add_index() can be active for a given table.

mem_heap_empty_noninline(): New function, to be called from ha_innodb.cc.

row_build_index_for_mysql(): Remove the parameter new_primary.

row_merge_remove_index(), row_merge_rename_index(): Remove risky sprintf()
calls.  Make use of named literals and que_eval_sql().

Move more definitions from row0mysql.h to row0mysql.c.  Remove the
unused definition of merge_thread.

merge_index_def_t: Replace merge_index_field_t** with merge_index_field_t*.
Use mem_heap_strdup() when copying strings.

ha_innobase::add_index(): Avoid excessive use of current_thd.

assignments.  A memory leak remains at "goto error_handling": the memory
allocated with row_merge_block_create() in the beginning of this function
will not be freed.

Define the merge_rec_ structures in row0merge.c instead of
row0merge.h.  They are not used in the interface defined in row0merge.h.

row_merge_create_file_structure(): Rename to row_merge_file_create().
Input a pointer to a pre-allocated block of memory.

row_merge_read_clustered_index(): Replace merge_file_t** with merge_file_t*.

row_merge_sort_and_insert_thread(): Remove the declaration.
This function was never defined or called.

row_merge_is_index_usable(): Correct the formatting.

row_build_index_for_mysql(): Allocate an array of merge_file_t instead
of an array of pointers to merge_file_t.

ha_innodb.cc: Add the columns COMPRESSED, COMPRESSED_OK, DECOMPRESSED
to INFORMATION_SCHEMA.INNODB_BUDDY.

page_zip_compress_count[], page_zip_compress_ok[]: New statistic counters,
incremented in page_zip_compress().

page_zip_decompress_count[]: New statistic counter,
incremented in page_zip_decompress().

innodb.test: The error code 1540 has been renumbered to 1542.
innodb.result: Adjust the expected value of Innodb_buffer_pool_pages_total.
Something may have changed in the BLOB handling in branches/zip.

ha_innodb.cc: Add ha_innobase:: prefix to some DBUG_ENTER macros.

row_merge_create_temporary_table(): Free the heap only after invoking
row_create_table_for_mysql().  The table->col_names points to the heap
until the system columns are added by row_create_table_for_mysql().

TODO: use the filename-safe encoding in temporary table names.  Test
extensively under Valgrind and fix all errors found.  Eliminate
merge_rec_t and rewrite row0merge.c to write the records directly to
the merge blocks.

Fix some bugs.  The tests innodb and innodb-index fail, but that might
be due to an old MySQL source tree being used.