Github user AnthonyTruchet closed the pull request at:
https://github.com/apache/spark/pull/16078
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GitHub user AnthonyTruchet opened a pull request:
https://github.com/apache/spark/pull/16078
[SPARK-18471][MLLIB] Fix huge vectors of zero send in closure in L-BFGS
## What changes were proposed in this pull request?
Introduced util TreeAggregatorWithZeroGenerator and used
