fix(db-postgres): query has many relationships nested in row fields (#9944) (#9944)

### What?
Querying by nested to rows fields in has many relationships like this:
```ts
const result = await payload.find({
  collection: 'relationship-fields',
  where: {
    'relationToRowMany.title': { equals: 'some-title' },
  },
})
```
Where the related collection:
```ts
const RowFields: CollectionConfig = {
  slug: rowFieldsSlug,
  fields: [
    {
      type: 'row',
      fields: [
        {
          name: 'title',
          label: 'Title within a row',
          type: 'text',
          required: true,
        },
      ],
    },
  ],
}
```

was broken

### Why?
We migrated to use `flattenedFields`, but not in this specific case.
This error would be caught earlier we used `noImplictAny` typescript
rule. https://www.typescriptlang.org/tsconfig/#noImplicitAny which
wouldn't allow us to create variable like this:
```ts
let relationshipFields // relationshipFields is any here
```
Instead, we should write:
```ts
let relationshipFields: FlattenedField[]
```
We should migrate to it and `strictNullChecks` as well.

Fixes https://github.com/payloadcms/payload/issues/9534

packages/drizzle/src/queries/getTableColumnFromPath.ts

@@ -358,7 +358,7 @@ export const getTableColumnFromPath = ({
         const newCollectionPath = pathSegments.slice(1).join('.')
 
         if (Array.isArray(field.relationTo) || field.hasMany) {
-          let relationshipFields
+          let relationshipFields: FlattenedField[]
           const relationTableName = `${rootTableName}${adapter.relationshipsSuffix}`
           const {
             newAliasTable: aliasRelationshipTable,
@@ -405,7 +405,7 @@ export const getTableColumnFromPath = ({
             newTableName = adapter.tableNameMap.get(toSnakeCase(relationshipConfig.slug))
 
             // parent to relationship join table
-            relationshipFields = relationshipConfig.fields
+            relationshipFields = relationshipConfig.flattenedFields
             ;({ newAliasTable } = getTableAlias({ adapter, tableName: newTableName }))
 
             joins.push({

test/fields/collections/Relationship/index.ts

@@ -115,6 +115,17 @@ const RelationshipFields: CollectionConfig = {
       minRows: 2,
       type: 'relationship',
     },
+    {
+      name: 'relationToRow',
+      relationTo: 'row-fields',
+      type: 'relationship',
+    },
+    {
+      name: 'relationToRowMany',
+      relationTo: 'row-fields',
+      type: 'relationship',
+      hasMany: true,
+    },
   ],
   slug: relationshipFieldsSlug,
 }

test/fields/int.spec.ts

@@ -453,6 +453,37 @@ describe('Fields', () => {
       expect(result.docs).toHaveLength(1)
       expect(result.docs[0]).toMatchObject(relationshipInArray)
     })
+
+    it('should query text in row after relationship', async () => {
+      const row = await payload.create({
+        collection: 'row-fields',
+        data: { title: 'some-title', id: 'custom-row-id' },
+      })
+      const textDoc = await payload.create({
+        collection: 'text-fields',
+        data: { text: 'asd' },
+      })
+
+      const rel = await payload.create({
+        collection: 'relationship-fields',
+        data: {
+          relationship: { relationTo: 'text-fields', value: textDoc },
+          relationToRow: row.id,
+          relationToRowMany: [row.id],
+        },
+      })
+
+      const result = await payload.find({
+        collection: 'relationship-fields',
+        where: {
+          'relationToRow.title': { equals: 'some-title' },
+          'relationToRowMany.title': { equals: 'some-title' },
+        },
+      })
+
+      expect(result.docs[0].id).toBe(rel.id)
+      expect(result.totalDocs).toBe(1)
+    })
   })
 
   describe('timestamps', () => {

test/fields/payload-types.ts

@@ -1335,6 +1335,8 @@ export interface RelationshipField {
         value: string | TextField;
       }[]
     | null;
+  relationToRow?: (string | null) | RowField;
+  relationToRowMany?: (string | RowField)[] | null;
   updatedAt: string;
   createdAt: string;
 }
@@ -2970,6 +2972,8 @@ export interface RelationshipFieldsSelect<T extends boolean = true> {
         id?: T;
       };
   relationshipWithMinRows?: T;
+  relationToRow?: T;
+  relationToRowMany?: T;
   updatedAt?: T;
   createdAt?: T;
 }