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

• Unit Test
• Logic Test
• Benchmark Test
• 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
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is