Filter may override root query in v0.8.1

[zhicwu]

Steps to reproduce:

• schema and test data

mutation {
  schema {
    test_key: string @index(exact) .
    test_value: string @index(exact) .
  }
  set {
    _:test_1 <test_key> "key1" .
    _:test_1 <test_value> "value1" .
    _:test_2 <test_key> "key2" .
    _:test_2 <test_value> "value2" .
  }
}

• query

{
  v as var(func: eq(test_key, "key1")) @filter(eq(test_key, "key2"))
}
{
  q(func: uid(v)) {
    test_key
    test_value
  }
}

• actual response - should be empty?

{
  "data": {
    "q": [
      {
        "_uid_": "0x11945",
        "test_key": "key2",
        "test_value": "value2"
      }
    ],
    "server_latency": {
      "processing": "310µs",
      "json": "104µs",
      "total": "604µs",
      "parsing": "184µs"
    }
  }
}

[pawanrawal]

Thanks for the report @zhicwu. Seems to be a bug with variable assignment as the below query gives the expected result.

{
  me(func: eq(test_key, "key1")) @filter(eq(test_key, "key2")) {
    test_key
    test_value
  }
}

I suspect variable is being assigned without applying the filters.