--source include/have_innodb.inc
--source include/have_sequence.inc
--source include/not_embedded.inc

--echo
--echo # MDEV-36410 wrong result with index_merge on indexes having descending primary key
--echo #

set optimizer_trace='enabled=on';
SET @save_sort_buffer_size=@@sort_buffer_size;
SET SESSION sort_buffer_size = 1024*16;

CREATE TABLE t1 (
  id bigint(20) NOT NULL,
  title varchar(255) NOT NULL,
  status tinyint(4) DEFAULT 0,
  country_code varchar(5) DEFAULT NULL,
  PRIMARY KEY (id),
  KEY idx_status (status),
  KEY idx_country_code_status_id (country_code,status,id DESC)
) ENGINE=InnoDB;

INSERT INTO t1(id,title,status,country_code)
SELECT seq, CONCAT('abc', seq), seq%10, CONCAT('C', seq%5) FROM seq_1_to_500;

--echo # This must not use index_merge:
EXPLAIN
SELECT * FROM t1 WHERE country_code ='C1' and `status` =1;
set @trace= (select JSON_EXTRACT(trace, '$**.range_scan_alternatives[*]')
             from INFORMATION_SCHEMA.OPTIMIZER_TRACE);
select json_detailed(json_extract(@trace, '$[*].index')) as INDEXES;
select json_detailed(json_extract(@trace, '$[*].rowid_ordered')) as ROR;

#select JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives[*].index')) AS JS from INFORMATION_SCHEMA.OPTIMIZER_TRACE;

DROP table t1;

--echo # Now, try with indexes using ASC ordering and PK using DESC
CREATE TABLE t1 (
  id bigint(20) NOT NULL,
  title varchar(255) NOT NULL,
  status tinyint(4) DEFAULT 0,
  country_code varchar(5) DEFAULT NULL,
  PRIMARY KEY (id DESC),
  KEY idx_status (status),
  KEY idx_country_code_status_id (country_code,status,id)
) ENGINE=InnoDB;

INSERT INTO t1(id,title,status,country_code)
SELECT seq, CONCAT('abc', seq), seq%10, CONCAT('C', seq%5) FROM seq_1_to_500;

--echo # Must not use index_merge:
EXPLAIN
SELECT * FROM t1 WHERE country_code ='C1' and status = 1;

set @trace= (select JSON_EXTRACT(trace, '$**.range_scan_alternatives[*]')
             from INFORMATION_SCHEMA.OPTIMIZER_TRACE);
select json_detailed(json_extract(@trace, '$[*].index')) as INDEXES;
select json_detailed(json_extract(@trace, '$[*].rowid_ordered')) as ROR;

DROP TABLE t1;

--echo # Now, try with indexes using DESC ordering and PK using DESC
CREATE TABLE t1 (
  id bigint(20) NOT NULL,
  title varchar(255) NOT NULL,
  status tinyint(4) DEFAULT 0,
  country_code varchar(5) DEFAULT NULL,
  PRIMARY KEY (id DESC),
  KEY idx_status (status),
  KEY idx_country_code_status_id (country_code,status,id DESC)
) ENGINE=InnoDB;

INSERT INTO t1(id,title,status,country_code)
SELECT seq, CONCAT('abc', seq), seq%10, CONCAT('C', seq%5) FROM seq_1_to_500;

--echo # Must not use index_merge:
EXPLAIN
SELECT * FROM t1 WHERE country_code ='C1' and status = 1;

set @trace= (select JSON_EXTRACT(trace, '$**.range_scan_alternatives[*]')
             from INFORMATION_SCHEMA.OPTIMIZER_TRACE);
select json_detailed(json_extract(@trace, '$[*].index')) as INDEXES;
select json_detailed(json_extract(@trace, '$[*].rowid_ordered')) as ROR;

DROP TABLE t1;

SET sort_buffer_size= @save_sort_buffer_size;