Datetime type storing empty string for "0001-01-01T00:00:00Z"

[arijitAD]

What version of Dgraph are you using?

master

Have you tried reproducing the issue with the latest release?

Yes

What is the hardware spec (RAM, OS)?

32 GB Ubuntu Linux

Steps to reproduce the issue (command/config used to run Dgraph).

Mutation

{
  "set": [
    {
      "created_at": "0000-01-01T00:00:00Z"
    },
    {
      "created_at": "0001-01-01T00:00:00Z"
    },
    {
      "created_at": "0002-01-01T00:00:00Z"
    },
    {
      "created_at": "0003-01-01T00:00:00Z"
    },
    {
      "created_at": "0001-02-02T00:00:00Z"
    }
    ]
}

Query

{
  q(func: has(created_at)) {
    uid
    created_at
  }
}

Expected behavior and actual result.

Expected:

{
    "data": {
		"q": [
		  {
			"uid": "0x18",
			"created_at": "0000-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x19",
			"created_at": "0001-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x1a",
			"created_at": "0002-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x1b",
			"created_at": "0003-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x1c",
			"created_at": "0001-02-02T00:00:00Z"
		  }
		]
    }
}

Actual:

{
    "data": {
		"q": [
		  {
			"uid": "0x18",
			"created_at": "0000-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x19",
			"created_at": ""
		  },
		  {
			"uid": "0x1a",
			"created_at": "0002-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x1b",
			"created_at": "0003-01-01T00:00:00Z"
		  },
		  {
			"uid": "0x1c",
			"created_at": "0001-02-02T00:00:00Z"
		  }
		]
    }
}

Reference:
https://discuss.dgraph.io/t/datetime-type-storing-empty-string-for-0001-01-01t0000z/6276/3

[minhaj-shakeel]

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