MDEV-10139 Support for SEQUENCE objects

Working features:
CREATE OR REPLACE [TEMPORARY] SEQUENCE [IF NOT EXISTS] name
    [ INCREMENT [ BY | = ] increment ]
    [ MINVALUE [=] minvalue | NO MINVALUE ]
    [ MAXVALUE [=] maxvalue | NO MAXVALUE ]
    [ START [ WITH | = ] start ] [ CACHE [=] cache ] [ [ NO ] CYCLE ]
    ENGINE=xxx COMMENT=".."
SELECT NEXT VALUE FOR sequence_name;
SELECT NEXTVAL(sequence_name);
SELECT PREVIOUS VALUE FOR sequence_name;
SELECT LASTVAL(sequence_name);

SHOW CREATE SEQUENCE sequence_name;
SHOW CREATE TABLE sequence_name;
CREATE TABLE sequence-structure ... SEQUENCE=1
ALTER TABLE sequence RENAME TO sequence2;
RENAME TABLE sequence TO sequence2;
DROP [TEMPORARY] SEQUENCE  [IF EXISTS] sequence_names

Missing features
- SETVAL(value,sequence_name), to be used with replication.
- Check replication, including checking that sequence tables are marked
  not transactional.
- Check that a commit happens for NEXT VALUE that changes table data (may
  already work)
- ALTER SEQUENCE. ANSI SQL version of setval.
- Share identical sequence entries to not add things twice to table list.
- testing insert/delete/update/truncate/load data
- Run and fix Alibaba sequence tests (part of mysql-test/suite/sql_sequence)
- Write documentation for NEXT VALUE / PREVIOUS_VALUE
- NEXTVAL in DEFAULT
  - Ensure that NEXTVAL in DEFAULT uses database from base table
- Two NEXTVAL for same row should give same answer.
- Oracle syntax sequence_table.nextval, without any FOR or FROM.
- Sequence tables are treated as 'not read constant tables' by SELECT; Would
  be better if we would have a separate list for sequence tables so that
  select doesn't know about them, except if refereed to with FROM.

Other things done:
- Improved output for safemalloc backtrack
- frm_type_enum changed to Table_type
- Removed lex->is_view and replaced with lex->table_type. This allows
  use to more easy check if item is view, sequence or table.
- Added table flag HA_CAN_TABLES_WITHOUT_ROLLBACK, needed for handlers
  that want's to support sequences
- Added handler calls:
 - engine_name(), to simplify getting engine name for partition and sequences
 - update_first_row(), to be able to do efficient sequence implementations.
 - Made binlog_log_row() global to be able to call it from ha_sequence.cc
- Added handler variable: row_already_logged, to be able to flag that the
  changed row is already logging to replication log.
- Added CF_DB_CHANGE and CF_SCHEMA_CHANGE flags to simplify
  deny_updates_if_read_only_option()
- Added sp_add_cfetch() to avoid new conflicts in sql_yacc.yy
- Moved code for add_table_options() out from sql_show.cc::show_create_table()
- Added String::append_longlong() and used it in sql_show.cc to simplify code.
- Added extra option to dd_frm_type() and ha_table_exists to indicate if
  the table is a sequence. Needed by DROP SQUENCE to not drop a table.

1 files changed, 8 insertions, 8 deletions

diff --git a/mysql-test/r/udf.result b/mysql-test/r/udf.result
index 98aa2b50fc6..6af6b167511 100644
--- a/mysql-test/r/udf.result
+++ b/mysql-test/r/udf.result
@@ -4,7 +4,7 @@ CREATE FUNCTION myfunc_double RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
 CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
 ERROR HY000: Can't find symbol 'myfunc_nonexist' in library
 CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
-CREATE FUNCTION sequence RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
+CREATE FUNCTION udf_sequence RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
 CREATE FUNCTION lookup RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
 CREATE FUNCTION reverse_lookup
 RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
@@ -226,7 +226,7 @@ DROP FUNCTION myfunc_double;
 DROP FUNCTION myfunc_nonexist;
 ERROR 42000: FUNCTION test.myfunc_nonexist does not exist
 DROP FUNCTION myfunc_int;
-DROP FUNCTION sequence;
+DROP FUNCTION udf_sequence;
 DROP FUNCTION lookup;
 DROP FUNCTION reverse_lookup;
 DROP FUNCTION avgcost;
@@ -340,32 +340,32 @@ DROP FUNCTION check_const_len;
 DROP PROCEDURE check_const_len_sp;
 DROP TRIGGER check_const_len_trigger;
 DROP TABLE const_len_bug;
-CREATE FUNCTION sequence RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
+CREATE FUNCTION udf_sequence RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
 CREATE TABLE t1 (a INT);
 CREATE TABLE t2 (a INT PRIMARY KEY);
 INSERT INTO t1 VALUES (4),(3),(2),(1);
 INSERT INTO t2 SELECT * FROM t1;
-SELECT sequence() AS seq, a FROM t1 ORDER BY seq ASC;
+SELECT udf_sequence() AS seq, a FROM t1 ORDER BY seq ASC;
 seq	a
 1	4
 2	3
 3	2
 4	1
-SELECT sequence() AS seq, a FROM t1 ORDER BY seq DESC;
+SELECT udf_sequence() AS seq, a FROM t1 ORDER BY seq DESC;
 seq	a
 4	1
 3	2
 2	3
 1	4
-SELECT * FROM t1 WHERE a = sequence();
+SELECT * FROM t1 WHERE a = udf_sequence();
 a
-SELECT * FROM t2 WHERE a = sequence();
+SELECT * FROM t2 WHERE a = udf_sequence();
 a
 1
 2
 3
 4
-DROP FUNCTION sequence;
+DROP FUNCTION udf_sequence;
 DROP TABLE t1,t2;
 drop function if exists test.metaphon;
 drop function if exists metaphon;