CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10));

INSERT INTO t VALUES (11, 3, DEFAULT, 'mm');

INSERT INTO t VALUES (18, 1, DEFAULT, 'mm');

INSERT INTO t VALUES (28, 1, DEFAULT, 'mm');

INSERT INTO t VALUES (null, null, DEFAULT, 'mm');

CREATE INDEX idx_1 on t(c);

SET SESSION debug_dbug="+d,create_index_fail";

--error ER_DUP_ENTRY

ALTER TABLE t ADD COLUMN x INT GENERATED ALWAYS AS(a+b), ADD INDEX idx (x);

SET SESSION debug_dbug="";

SHOW CREATE TABLE t;

SELECT c FROM t;

DROP TABLE t;

	/* Remove the index from affected virtual column index list */

	if (dict_index_has_virtual(index)) {

		const dict_col_t*	col;

		const dict_v_col_t*	vcol;

		for (ulint i = 0; i < dict_index_get_n_fields(index); i++) {

			col =  dict_index_get_nth_col(index, i);

			if (dict_col_is_virtual(col)) {

			...