In cube.js, how would I query over contents of an array? - cube.js

Question

Let's say I have an array of info (ex: tags: ['red', 'blue', 'green'] ) in my data. How would I add that to my cube(s) to do something like a filter on tags array contains a particular value?
I'm specifically using the Athena driver with pre-aggregation into Aurora Postgres.
This is where I have gotten so far, but it's not quite there yet.
cube(`Events`, {
sql: `select * from events`,
joins: {
Tags: {
relationship: `hasMany`,
sql: `${tags}.id = ${tags}`
}
},
});
cube(`Tags`, {
sql: `UNNEST(tags) t (id, idx)`,
dimensions: {
tag: {
sql: `id`,
type: `string`
}
}
});

Answer 1

It's a right direction. Primary keys and select for events table in tags cube should be added:
cube(`Events`, {
sql: `select * from events`,
joins: {
Tags: {
relationship: `hasMany`,
sql: `${Events}.id = ${Tags}.id`
}
},
dimensions: {
id: {
sql: `id`,
type: `string`,
primaryKey: true
}
}
});
cube(`Tags`, {
sql: `select e.id, t.id as tag from events e CROSS JOIN UNNEST(tags) t (id, idx)`,
dimensions: {
id: {
sql: `id || tag`,
type: `string`,
primaryKey: true
},
tag: {
sql: `tag`,
type: `string`
}
}
});
Then equals filter on a Tags cube can be used to query it:
{
"measures": ["Events.count"],
"filters": [{
"dimension": "Tags.tag",
"operator": "equals",
"values": ["red"]
}]
}