innodb_zip.index_large_prefix_4k fails with ER_TOO_BIG_ROWSIZE

$ perl ./mtr innodb_zip.index_large_prefix_4k --mysqld=--innodb-page-size=4k

innodb_zip.index_large_prefix_4k 'innodb' [ fail ]

        Test ended at 2020-02-06 21:34:29

CURRENT_TEST: innodb_zip.index_large_prefix_4k

mysqltest: At line 159: query 'create index idx1 on worklog5743_2(a2(4000))' failed: 1118: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 1982. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

The result from queries just before the failure was:

< snip >

ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 1982. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

show warnings;

Level	Code	Message

Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 1982. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

create index idx4 on worklog5743_1(a2(434));

show warnings;

Level	Code	Message

create index idx5 on worklog5743_1(a1, a2(430));

ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 1982. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

show warnings;

Level	Code	Message

Error	1118	Row size too large. The maximum row size for the used table type, not counting BLOBs, is 1982. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

create index idx6 on worklog5743_1(a1, a2(428));

show warnings;

Level	Code	Message

set global innodb_large_prefix=1;

Warnings:

Warning	131	Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See https://mariadb.com/kb/en/library/xtradbinnodb-file-format/

SET sql_mode= '';

create index idx1 on worklog5743_2(a2(4000));

More results from queries before failure can be found in /data/bld/10.2-debug-nightly/mysql-test/var/log/index_large_prefix_4k.log