$$PARENT for $redact Aggregations

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      It would be nice, if it's possible to access the parent within a $redact Aggregation.

      Example:

      {
  id: ...,
  i18n: {
    en: {
      foo: "bar",
      _lang: "en"
    },
    jp: {
      foo: "baz",
      _lang: "jp"
    }
  }
}

      Now I'd like to retrieve everything with i18n = jp, and keep a fallback to i18n = en. The code could look like this:

      { $redact: {
    $cond: {
        if: {
            $or: [
                { $not : "$_lang" },
                { $eq: [ "$_lang", "jp" ] },
                { $and: [
                    { $eq: [ "$_lang", "en" ] },
                    { $not: "$$PARENT.jp" }
                ]}
            ]
        },
        then: "$$DESCEND",
        else: "$$PRUNE"
    }
}}

      Thank you!

            Assignee:
            [DO NOT USE] Backlog - Query Execution
            Reporter:
            Benjamin M
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              Created:
              Updated: