Allow instant ALTER TABLE even if FULLTEXT INDEX exists

--source include/have_innodb.inc

--disable_abort_on_error

--disable_warnings

CREATE TABLE IF NOT EXISTS t1 (col1 INT, col2 INT, col_int INTEGER, col_text TEXT) ENGINE = InnoDB  ;

ALTER TABLE t1 ADD FULLTEXT KEY `Marvão_ftidx1` ( col_text ), ADD FULLTEXT KEY IF NOT EXISTS `Marvão_ftidx1` ( col_text )  ;

INSERT INTO t1 (col1,col2, col_int, col_text) VALUES ( 1, 1, 1 - 1, REPEAT(CAST( 1 AS CHAR(1)), @fill_amount) ) ;

ALTER TABLE t1 ADD COLUMN col_int_copy INTEGER FIRST, ALGORITHM = DEFAULT  ;

ALTER TABLE t1 DROP COLUMN IF EXISTS col_int  ;

ALTER TABLE t1 CHANGE COLUMN IF EXISTS col_int_copy Col_int INTEGER, LOCK = NONE, ALGORITHM = INPLACE  ;

UPDATE t1 SET col1 = 28 LIMIT 2;

ALTER TABLE t1 ADD FULLTEXT KEY `Marvão_ftidx1` ( col_text ), ADD FULLTEXT KEY IF NOT EXISTS `Marvão_ftidx1` ( col_text )  ;

INSERT INTO t1 (col1,col2, col_int, col_text) VALUES ( 1, 1, 1 - 1, REPEAT(CAST( 1 AS CHAR(1)), @fill_amount) ) ;

DROP TABLE t1;

mysqld: fts/fts0fts.cc:3265: void fts_fetch_doc_from_rec(fts_get_doc_t*, dict_index_t*, btr_pcur_t*, ulint*, fts_doc_t*): Assertion `!page_rec_is_comp(clust_rec) || rec_get_status(clust_rec) == REC_STATUS_ORDINARY' failed.