chore(executor): more edge detail for executing graph

[zhang2014]

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Summary

chore(executor): more edge detail for executing graph

before:

digraph {
    0 [ label = "system.one" ]
    1 [ label = "CompoundBlockOperator(Map)" ]
    2 [ label = "CompoundBlockOperator(Project)" ]
    3 [ label = "PullingExecutorSink" ]
    0 -> 1 [ ]
    1 -> 2 [ ]
    2 -> 3 [ ]
}

after

digraph {
    0 [ label = "system.one" ]
    1 [ label = "CompoundBlockOperator(Map)" ]
    2 [ label = "CompoundBlockOperator(Project)" ]
    3 [ label = "PullingExecutorSink" ]
    0 -> 1 [ 0 -> 0]
    1 -> 2 [ 0 -> 0]
    2 -> 3 [ 0 -> 0]
}

Tests

• [x] Unit Test
• [ ] Logic Test
• [ ] Benchmark Test
• [x] No Test - log

Type of change

• [ ] Bug Fix (non-breaking change which fixes an issue)
• [ ] New Feature (non-breaking change which adds functionality)
• [ ] Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• [ ] Documentation Update
• [x] Refactoring
• [ ] Performance Improvement
• [ ] Other (please describe):

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This change is