MySQL: index json arrays of variable length?

Question

I want to make a tags column of type json:

e.g.,

id  |  tags
=========================================
1   |  \'["tag1"         


        

Answer 1

It's now possible with MySQL 8.0.17+

Something like this (not tested)

CREATE TABLE posts (
    id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    tags JSON,
    INDEX tags( (CAST(tags AS VARCHAR(32) ARRAY)) )
    );

Use it this way:

SELECT * FROM posts 
         WHERE JSON_CONTAINS(tags, CAST('[tag1, tag2]' AS JSON));

More details and samples here: https://dev.mysql.com/doc/refman/8.0/en/json.html