Set correct posting list type while creating it in live loader.

[arijitAD]

Fixes DGRAPH-1100
Posting list type was not properly set and hence it was panicking while generating tokens.
Tested this with the following data.
Data File

<_:blank> <ida> "991" .
<_:blank> <ida> "991"^^<xs:int> .
<10511170691297417216> <initial_release_date> "1957-01-01T00:00:00Z" .
<m.010rcp1x>    <initial_release_date>  "1971-06-12"^^<http://www.w3.org/2001/XMLSchema#date>

Schema File

ida: int @index(int) .
initial_release_date : datetime @index(year) .

The same code for converting the posting list is there in copyValue() in gql/mutation.go
Tested this patch in v20.03.0-beta.20200320 as well.

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This change is 

[martinmr]

I have a question but if the answer doesn't require any code changes then this pr

Reviewed 1 of 1 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @arijitAD, @manishrjain, and @MichelDiz)

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dgraph/cmd/live/batch.go, line 304 at r1 (raw file):

			Value: de.GetValue(),
		}
		// If the value type is not already set according to the schema, set it to string and

Why is this not needed anymore?

[arijitAD]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @manishrjain, @martinmr, and @MichelDiz)

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dgraph/cmd/live/batch.go, line 304 at r1 (raw file):

Previously, martinmr (Martin Martinez Rivera) wrote…

Why is this not needed anymore?

If the value type is not set according to schema then data will be set to binary type by default and the next line converts the data to the schema type.