This doesn't sync, so call this only when you don't care about dirty posting lists in // memory(for example before populating snapshot) or after calling syncAllMarks.

Get stores the List corresponding to key, if it's not there already.

GetLru checks the lru map and returns it if it exits.

GetNoStore takes a key.

Init initializes the posting lists package, the in memory and dirty list hash.

constructs the posting list from the disk using the passed iterator.

RebuildIndex rebuilds index for a given attribute.

This function is called when the schema is changed from scalar to list type.

RebuildReverseEdges rebuilds the reverse edges for a given attribute.

TypeID returns the typeid of destination vertex.

Copies the val if it's uid only posting, be careful.

Metadata Bit which is stored to find out whether the stored value is pl or byte slice.

Del means delete in mutation layer.

Set means overwrite in mutation layer.

ErrNoValue would be returned if no value was found in the posting list.

ErrRetry can be triggered if the posting list got deleted from memory due to a hard commit.

BTree is an implementation of a B-Tree.

ListOptions is used in List.Uids (in posting) to customize our output list of UIDs, for each posting list.