Possible bug in GraphQL layer in Dgraph when altering schema via /alter

[abhimanyusinghgaur]

@Anurag

if anyone wants to update the schema, best way is to DROP_ALL and re-upload.

Danger ahead, Proceed with caution : DROP_ALL will remove all data, which is not what someone would expect during schema update. Data should be preserved, only the schema should be updated, is what would be a general expectation.