Given that INSERT DELAYED .. RETURNING in general doesn't work "by design" (it doesn't normally fail, just doesn't return the result set it would have returned without DELAYED), it isn't a meaningful scenario, but I'll file it for the record anyway.
create table t (v vector(1) not null, vector(v)) engine=MyISAM;
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insert delayed into t values (0x31313131),(0x32323232) returning vec_distance(v,0x30303030);
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drop table t;
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bb-11.8-MDEV-35450-vec_distance b4c96d33bd38a9008e903aaff12d29c6e904eeed
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mysqltest: At line 2: query 'insert delayed into t values (0x31313131),(0x32323232) returning vec_distance(v,0x30303030)' failed: ER_VEC_DISTANCE_TYPE (4206): Cannot determine distance type for VEC_DISTANCE, index is not found
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Bug
Trivial
MDEV-35450 VEC_DISTANCE() function to autouse the available index type
