optimize source chain operator

[siyuan0322]

Description

GIE scan all vertices unnecessarily for a simple query like g.V().has('label','id', xxx).out().
It should use primary key to find the exact vertex.

Relational Context

This bug was found in an experiment of an industrial paper, where some simple query cost too much time to execute.

[sighingnow]

LGTM 👍

[codecov-io]

Codecov Report

Merging #152 (4d44172) into main (16a93ea) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #152   +/-   ##
=======================================
  Coverage   78.56%   78.56%           
=======================================
  Files          50       50           
  Lines        4576     4576           
=======================================
  Hits         3595     3595           
  Misses        981      981           

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