Feature/sample go

[Shylock-Hg]

Sub job of #2602

[nevermore3]

i think you should write a design document first，
And this design does not sample every step under many conditions

[Shylock-Hg]

i think you should write a design document first，
And this design does not sample every step under many conditions

Multiple steps need change some plan nodes, I plan to do it later. Now just one step.

[nevermore3]

i think you should write a design document first，
And this design does not sample every step under many conditions

Multiple steps need change some plan nodes, I plan to do it later. Now just one step.

it only work for go from vid over * yield $^.tag.name, edge.name sample[1],

It won't work with a little change, for example: go from vid over * yield $$.tag.name, go from vid over * yield edge._dst as id | go from $-.id over * yield edge.name sample[1], ....

[Shylock-Hg]

i think you should write a design document first，
And this design does not sample every step under many conditions

Multiple steps need change some plan nodes, I plan to do it later. Now just one step.

it only work for go from vid over * yield $^.tag.name, edge.name sample[1],

It won't work with a little change, for example: go from vid over * yield $$.tag.name, go from vid over * yield edge._dst as id | go from $-.id over * yield edge.name sample[1], ....

With input, now sample the result of join. Do you think it's problem?

[codecov-commenter]

Codecov Report

Merging #2853 (69d0277) into master (dddf54e) will decrease coverage by 0.70%.
The diff coverage is 69.87%.

❗ Current head 69d0277 differs from pull request most recent head 93a9bdd. Consider uploading reports for the commit 93a9bdd to get more accurate results

@@            Coverage Diff             @@
##           master    #2853      +/-   ##
==========================================
- Coverage   85.47%   84.76%   -0.71%     
==========================================
  Files        1229     1236       +7     
  Lines      110375   111025     +650     
==========================================
- Hits        94341    94114     -227     
- Misses      16034    16911     +877     

Impacted Files	Coverage Δ
src/clients/meta/MetaClient.h	92.30% <ø> (ø)
src/common/utils/NebulaKeyUtils.cpp	89.03% <0.00%> (-4.89%)	⬇️
src/common/utils/NebulaKeyUtils.h	78.02% <ø> (ø)
src/graph/planner/SequentialPlanner.cpp	100.00% <ø> (ø)
src/graph/planner/plan/Admin.cpp	54.23% <0.00%> (-2.40%)	⬇️
src/graph/planner/plan/PlanNode.h	80.00% <ø> (ø)
src/graph/service/PermissionCheck.cpp	83.33% <ø> (+1.93%)	⬆️
src/kvstore/KVEngine.h	100.00% <ø> (ø)
src/kvstore/RocksEngine.cpp	81.79% <0.00%> (-1.73%)	⬇️
src/kvstore/RocksEngine.h	66.66% <0.00%> (-25.00%)	⬇️
... and 138 more

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