into mysql.com:/home/my/mysql-5.0
sql/item_func.cc:
Auto merged
sql/log_event.cc:
Auto merged
sql/mysql_priv.h:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_yacc.yy:
Auto merged
WL#874 "Extended LOAD DATA" was pushed.
mysql-test/r/binlog.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/t/binlog.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/innodb.result:
Added proper cleanup after test.
mysql-test/t/innodb.test:
We don't expect error if we create varchar(16384) column in Innodb
table anymore. (Heikki already removed error message from .result
file.) Also we should do proper cleanup after the test.
not always correct for NULL values.
Now they always result a non NULL value even
the argument is NULL. It is more usefull for
debugging purposes.
mysql-test/r/func_str.result:
Bugs#9129: CHARSET(), COLLATION(), COERCIBILITY()
not always correct for NULL values.
Also, a mistake in EXPORT_SET was fixed.
mysql-test/t/func_str.test:
Bugs#9129: CHARSET(), COLLATION(), COERCIBILITY()
not always correct for NULL values.
sql/item_func.cc:
Bugs#9129: CHARSET(), COLLATION(), COERCIBILITY()
not always correct for NULL values.
sql/item_strfunc.cc:
Bugs#9129: CHARSET(), COLLATION(), COERCIBILITY()
not always correct for NULL values.
A minor mistake in EXPORT_SET() was fixed.
Fix a crash in a simple search with a key: the dtype->len of a true VARCHAR is the payload maximum len in bytes: it does not include the 2 bytes MySQL uses to store the string length
ha_innodb.cc:
Fix a crash in true VARCHARs in test-innodb: we passed a wrong pointer to the column conversion in an UPDATE
rowid_order_innodb.result, ps_3innodb.result, innodb.result, endspace.result:
Edit InnoDB test results to reflect the arrival of true VARCHARs
mysql-test/r/endspace.result:
Edit InnoDB test results to reflect the arrival of true VARCHARs
mysql-test/r/innodb.result:
Edit InnoDB test results to reflect the arrival of true VARCHARs
mysql-test/r/ps_3innodb.result:
Edit InnoDB test results to reflect the arrival of true VARCHARs
mysql-test/r/rowid_order_innodb.result:
Edit InnoDB test results to reflect the arrival of true VARCHARs
sql/ha_innodb.cc:
Fix a crash in true VARCHARs in test-innodb: we passed a wrong pointer to the column conversion in an UPDATE
innobase/row/row0sel.c:
Fix a crash in a simple search with a key: the dtype->len of a true VARCHAR is the payload maximum len in bytes: it does not include the 2 bytes MySQL uses to store the string length
innobase/include/data0type.h:
Fix a crash in a simple search with a key: the dtype->len of a true VARCHAR is the payload maximum len in bytes: it does not include the 2 bytes MySQL uses to store the string length
The idea is to use TABLE_LIST::lock_type for passing type of lock for
target table to mysql_load() instead of using LEX::lock_option
(which were rewritten by first subselect in SET clause).
This should also fix potential problem with LOAD DATA in SP
(it is important for them to have right lock_type in the table
list by the end of statement parsing).
mysql-test/r/loaddata.result:
Added nice test for LOAD DATA with subquery.
mysql-test/t/loaddata.test:
Added nice test for LOAD DATA with subquery.
sql/log_event.cc:
Now we don't pass type of lock for target table to mysql_load()
explicitly . Instead we use TABLE_LIST::lock_type for this table
which is already properly set here.
sql/mysql_priv.h:
Now we don't pass type of lock for target table to mysql_load()
explicitly . Instead we properly set TABLE_LIST::lock_type for
this table in parser.
sql/sql_load.cc:
Now we don't pass type of lock for target table to mysql_load()
explicitly . Instead we properly set TABLE_LIST::lock_type for
this table in parser.
sql/sql_parse.cc:
Now we don't pass type of lock for target table to mysql_load()
explicitly . Instead we properly set TABLE_LIST::lock_type for
this table in parser.
sql/sql_yacc.yy:
load_data:
Let us use TABLE_LIST::lock_type for passing type of lock for target
table to mysql_load() instead of using LEX::lock_option (which will
be rewritten by first subselect in SET clause).
Check that there is a disabled.def before using it
disabled.def:
Reenable ndb tests accidently disabled
mysql-test/t/disabled.def:
Reenable ndb tests accidently disabled
mysql-test/mysql-test-run.sh:
Check that there is a disabled.def before using it
(otherwise a deadlock when ALTER writes to
binlog holding LOCK_open, it causes binlog rotation,
binlog waits for prepared transactions to commit, and commit
needs LOCK_open to check for global read lock)
mysql-test/r/flush.result:
global read lock code now uses a dedicated mutex
mysql-test/t/flush.test:
global read lock code now uses a dedicated mutex
sql/lock.cc:
global read lock code now uses a dedicated mutex
sql/mysql_priv.h:
global read lock code now uses a dedicated mutex
sql/mysqld.cc:
global read lock code now uses a dedicated mutex
sql/sql_table.cc:
global read lock code now uses a dedicated mutex
Added a test case for bug #8616.
item.h:
Fixed bug #8616.
Added class Item_null_result used in rollup processing.
sql_select.h, sql_select.cc:
Fixed bug #8616.
Added JOIN::rollup_write_data to cover rollup queries
with DISTINCT. Modified other rollup methods.
sql/sql_select.cc:
Fixed bug #8616.
Added JOIN::rollup_write_data to cover rollup queries
with DISTINCT. Modified other rollup methods.
sql/sql_select.h:
Fixed bug #8616.
Added JOIN::rollup_write_data to cover rollup queries
with DISTINCT. Modified other rollup methods.
sql/item.h:
Fixed bug #8616.
Added class Item_null_result used in rollup processing.
mysql-test/t/olap.test:
Added a test case for bug #8616.
mysql-test/r/olap.result:
Added a test case for bug #8616.
Changes to a test with a update to a table with 1001 columns, the last being a blob.
On HP, the test worked properly, but on other OSs, there's a problem with using the
blob column in an update where clause. The field method val_string(String *, char *)
should work, but doesn't seem to deal with blobd, and for some reason, cannot get
the correct value of the blob column from the byte pointer in update_row, "*old_data"
which is a byte pointer to the row in mysql format, that will be replaced with
"*new_data" (which conveniently has a field pointer to use to get values from).
Will document this.
mysql-test/r/federated.result:
New test results. These results have been tested on production and hpita2 successfully.
mysql-test/t/federated.test:
Changed blob column in this test due to some issues with HPUX handling it correctly
and other OSs not. Will document this (blobs in update where clause)
Now one can use user variables as target for data loaded from file
(besides table's columns). Also LOAD DATA got new SET-clause in which
one can specify values for table columns as expressions.
For example the following is possible:
LOAD DATA INFILE 'words.dat' INTO TABLE t1 (a, @b) SET c = @b + 1;
This patch also implements new way of replicating LOAD DATA.
Now we do it similarly to other queries.
We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event
client/mysqlbinlog.cc:
Added support of two new binary log events Begin_load_query_log_event and
Execute_load_query_log_Event which are used to replicate LOAD DATA INFILE.
mysql-test/r/ctype_ucs.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/insert_select.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/loaddata.result:
Added tests for new LOAD DATA features.
mysql-test/r/mix_innodb_myisam_binlog.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results (don't dare to get rid from binlog positions
completely since it seems that this test uses them).
mysql-test/r/mysqlbinlog.result:
New approach for binlogging of LOAD DATA statement. Now we store it as
usual query and rewrite part in which file is specified when needed.
So now mysqlbinlog output for LOAD DATA much more closer to its initial
form. Updated test'd results accordingly.
mysql-test/r/mysqldump.result:
Made test more robust to other tests failures.
mysql-test/r/rpl000015.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_change_master.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results.
mysql-test/r/rpl_charset.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly
mysql-test/r/rpl_deadlock.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly
mysql-test/r/rpl_error_ignored_table.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/rpl_flush_log_loop.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_flush_tables.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/rpl_loaddata.result:
New way of replicating LOAD DATA. Now we do it similarly to other
queries. We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event...
Updated test's results wwith new binlog positions.
mysql-test/r/rpl_loaddata_rule_m.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
Since now LOAD DATA is replicated much in the same way as usual query
--binlog_do/ignore_db work for it inthe same way as for usual queries.
mysql-test/r/rpl_loaddata_rule_s.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_loaddatalocal.result:
Added nice test for case when it is important that LOAD DATA LOCAL
ignores duplicates.
mysql-test/r/rpl_log.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly (don't dare to get rid from binlog
positions completely since it seems that this test uses them).
mysql-test/r/rpl_log_pos.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_max_relay_size.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_multi_query.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_relayrotate.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_replicate_do.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_reset_slave.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_rotate_logs.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_server_id1.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_server_id2.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly.
mysql-test/r/rpl_temporary.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/rpl_timezone.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/rpl_until.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results accordingly and tweaked test a bit to bring it
back to good shape.
mysql-test/r/rpl_user_variables.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/r/user_var.result:
Addition of two new types of binary log events shifted binlog positions.
Updated test's results and made it more robust for future similar
changes.
mysql-test/t/ctype_ucs.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and made it more robust for future similar
changes.
mysql-test/t/insert_select.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and made it more robust for future similar
changes.
mysql-test/t/loaddata.test:
Added test cases for new LOAD DATA functionality.
mysql-test/t/mix_innodb_myisam_binlog.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/mysqlbinlog.test:
New way of replicating LOAD DATA local. Now we do it similarly to other
queries. We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event...
Thus we need new binlog positions for LOAD DATA events.
mysql-test/t/mysqlbinlog2.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/mysqldump.test:
Made test more robust for failures of other tests.
mysql-test/t/rpl_charset.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/rpl_deadlock.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/rpl_error_ignored_table.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and made it more robust for future similar
changes.
mysql-test/t/rpl_flush_tables.test:
Addition of two new types of binary log events shifted binlog positions.
Made test more robust for future similar changes.
mysql-test/t/rpl_loaddata.test:
New way of replicating LOAD DATA. Now we do it similarly to other
queries. We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event...
Apropritely updated comments in test.
mysql-test/t/rpl_loaddata_rule_m.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and made it more robust for future similar
changes.
Since now LOAD DATA is replicated much in the same way as usual query
--binlog_do/ignore_db work for it inthe same way as for usual queries.
mysql-test/t/rpl_loaddata_rule_s.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/rpl_loaddatalocal.test:
Added nice test for case when it is important that LOAD DATA LOCAL
ignores duplicates.
mysql-test/t/rpl_log.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly (don't dare to get rid from binlog positions
completely since it seems that this test uses them).
mysql-test/t/rpl_log_pos.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/rpl_multi_query.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly.
mysql-test/t/rpl_temporary.test:
Addition of two new types of binary log events shifted binlog positions.
Made test more robust for future similar changes.
mysql-test/t/rpl_timezone.test:
Addition of two new types of binary log events shifted binlog positions.
Made test more robust for future similar changes.
mysql-test/t/rpl_until.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and tweaked it a bit to bring it back to good
shape.
mysql-test/t/rpl_user_variables.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and made it more robust for future similar
changes.
mysql-test/t/user_var.test:
Addition of two new types of binary log events shifted binlog positions.
Updated test accordingly and made it more robust for future similar
changes.
sql/item_func.cc:
Added Item_user_var_as_out_param class that represents user variable
which used as out parameter in LOAD DATA.
Moved code from Item_func_set_user_var::update_hash() function to
separate static function to be able to reuse it in this new class.
sql/item_func.h:
Added Item_user_var_as_out_param class that represents user variable
which used as out parameter in LOAD DATA.
sql/log_event.cc:
New way of replicating LOAD DATA. Now we do it similarly to other
queries. We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event.
sql/log_event.h:
New way of replicating LOAD DATA. Now we do it similarly to other
queries. We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event.
sql/mysql_priv.h:
Now mysql_load() has two more arguments. They are needed to pass list of
columns and corresponding expressions from new LOAD DATA's SET clause.
sql/share/errmsg.txt:
Added new error message which is used to forbid loading of data from
fixed length rows to variables.
sql/sql_lex.h:
Added LEX::fname_start/fname_end members.
They are pointers to part of LOAD DATA statement which should be
rewritten during replication (file name + little extra).
sql/sql_load.cc:
Added support for extended LOAD DATA.
Now one can use user variables as target for data loaded from file
(besides table's columns). Also LOAD DATA got new SET-clause in which
one can specify values for table columns as expressions.
Updated mysql_load()/read_fixed_length()/read_sep_field() to support
this functionality (now they can read data from file to both columns and
variables and assign do calculations and assignments specified in SET
clause).
We also use new approach for LOAD DATA binlogging/replication.
sql/sql_parse.cc:
mysql_execute_command():
Since now we have SET clause in LOAD DATA we should also check
permissions for tables used in its expressions. Also mysql_load()
has two more arguments to pass information about this clause.
sql/sql_repl.cc:
New way of replicating LOAD DATA. Now we do it similarly to other
queries. We store LOAD DATA query in new Execute_load_query event
(which is last in the sequence of events representing LOAD DATA).
When we are executing this event we simply rewrite part of query which
holds name of file (we use name of temporary file) and then execute it
as usual query. In the beggining of this sequence we use Begin_load_query
event which is almost identical to Append_file event.
sql/sql_repl.h:
struct st_load_file_info:
Removed memebers which are no longer needed for LOAD DATA binnlogging.
sql/sql_yacc.yy:
Added support for extended LOAD DATA syntax. Now one can use
user variables as target for data loaded from file (besides table's
columns). Also LOAD DATA got new SET-clause in which one can specify
values for table columns as expressions.
For example the following is possible:
LOAD DATA INFILE 'words.dat' INTO TABLE t1 (a, @b) SET c = @b + 1;
Also now we save pointers to the beginning and to the end of part of
LOAD DATA statement which should be rewritten during replication.
Rework to resolve ambigious grammer: conflict in join expression
handling of parentheses for nested joins and derived tables.
Tests included of failing statements
Optimize item construction for AND/OR logical expressions
mysql-test/r/select.result:
Bug#8670
Tests for failing expressions
mysql-test/t/select.test:
Bug#8670
Tests for failing expressions
sql/sql_parse.cc:
Bug#8670
method st_select_lex::end_nested_join() returns NULL when
there are no elements in the join.
sql/sql_yacc.yy:
Optimize construction for Item_cond_or and Item_cond_and
Reduces object count in case of complex expressions.
Bug#8670
Solve ambigious grammar.
Fix handling of parentheses in join expressions to
correct handling of nested joins and derived tables.
heap/hp_create.c:
Partly reverty back patch to ensure that auto_key and auto_key_type are calculated the same way
include/heap.h:
Partly reverty back patch to ensure that auto_key and auto_key_type are calculated the same way
mysql-test/mysql-test-run.sh:
made --skip-ndb a synonyme for --skip-ndbcluster
sql/ha_heap.cc:
Partly reverty back patch to ensure that auto_key and auto_key_type are calculated the same way
Added feature to disable tests from a list in a file "disabled.def"
Moved down the code that disables, so that --do-test and --start-from
don't list the disabled tests not in range.
disabled.def:
List of test cases to temporarely disable
mysql-test/t/disabled.def:
List of test cases to temporarely disable
mysql-test/mysql-test-run.sh:
Added feature to disable tests from a list in a file "disabled.def"
Moved down the code that disables, so that --do-test and --start-from
don't list the disabled tests not in range.
sql/ha_ndbcluster.h:
Auto merged
sql/mysqld.cc:
Auto merged
sql/set_var.cc:
Auto merged
sql/sql_class.h:
Auto merged
sql/ha_ndbcluster.cc:
Manual merge
-This is mostly fixes for correct behaviour when using query cache + transactions + the thread that
fetches commit count from NDB at regular intervals. The major fix is to add a
list in thd_ndb, that keeps a list of NDB_SHARE's that were modified by
transaction and then "clearing" them in ndbcluster_commit.
mysql-test/r/ndb_cache2.result:
Updated test cases for the ndb_util thread, more simultaneous tables and more tesst
mysql-test/t/ndb_cache2.test:
Updated test cases for the ndb_util thread, more simultaneous tables and more advanced tesst
sql/ha_ndbcluster.cc:
Add table changed during transaction to list of changed tables in Thd_ndb, this list is then used in ndbcluster_commit to invalidate the cached commit_count in share
Fix so that ndb_util_thread uses milliseconds "sleeps"
Changed so that ndb_commit_count uses the commit_count from share if available
sql/ha_ndbcluster.h:
Add commit_count_lock to NBD_SHARE, use for detecting simultaneous attempts to update commit_count
Add list of tables changed by transaction to Thd_ndb
Change check_ndb_connection to take thd as argument, use current_thd as default
Added m_rows_changed variable to keep track of if this handler has modified any records within the transaction
sql/set_var.cc:
Change format of code
Sort sys__ variables in aplha order
character set conversion of a string constant.
mysql-test/r/ctype_utf8.result:
Adding test
mysql-test/t/ctype_utf8.test:
Addign test
sql/item_strfunc.cc:
Remove previous fix: it was not 100% correct.
A non const_item() can return a constant String.
sql/sql_string.h:
A new method to cut Alloced_length to str_length for
string constants, to avoid reusing them as a buffer
in things like CONCAT().
Konstja and Georg, change sets 1.1806, 1.1805. These changes has been successfully
tested on both my own workstation (Suse 9.0) and production.mysql.com.
mysql-test/r/federated.result:
new test results for error handling tests.
mysql-test/t/federated.test:
new error handling tests
sql/ha_federated.cc:
- check_foreign_data source added
- table names now enclosed in '`' to allow for '%' or other characters
- better error handling
- mysql_init now checked to see if it returns true/false, error out if false (Georg)
BitKeeper/etc/logging_ok:
Logging to logging@openlogging.org accepted
Item_sum_count_distinct, and
deploy Unique for use with COUNT(DISTINCT) if there is no blob
column in the list of DISTINCT arguments.
mysql-test/r/count_distinct2.result:
Test results fixed.
mysql-test/r/func_group.result:
Updated.
mysql-test/r/sum_distinct.result:
Updated.
mysql-test/t/func_group.test:
Add a test for COUNT(DISTINCT) and true varchar and case-insensitive
collation. The table in the test contains only two distinct values.
mysql-test/t/sum_distinct.test:
Since now we support INSERT INTO t1 (a) SELECT a+1 FROM t1, shorten
the test.
Add a nominal test for AVG(DISTINCT)
sql/item_sum.cc:
Implementation of cleaned up Item_sum_count_distinct.
Fixed a bug with COUNT(DISTINCT) and new VARCHAR and collations.
Fixed a bug wiht AVG(DISTINCT) and wrong number of output digits
after decimal point.
sql/item_sum.h:
Cleanup for Item_sum_count_distinct.
Now if the list of distinct arguments doesn't contain a blob column,
we always use Unique and merge-sort to find distinct values.
sql/sql_class.h:
Added a short-cut to find number of elements in Unique if all elements fit
into memory.
