Previously, this wasn't valid in Postgres / SQLite:
```ts
const res = await payload.find({
collection: 'polymorphic-relationships',
where: {
polymorphic: {
equals: {
relationTo: 'movies',
value: movie.id,
},
},
},
})
```
Now it works and actually in more performant way than this:
```ts
const res = await payload.find({
collection: 'polymorphic-relationships',
where: {
and: [
{
'polymorphic.relationTo': {
equals: 'movies',
},
},
{
'polymorphic.value': {
equals: 'movies',
},
},
],
},
})
```
Why? Because with the object notation, the output SQL is: `movies_id =
1` - checks exactly 1 column in the `*_rels` table, while with the
separate query by `relationTo` and `value` we need to check against
_each_ possible relationship collection with OR.
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