Slow performance in TPCH_SF09

[djouallah]

very slow performance for some Queries compared to other Single Node Engines

https://colab.research.google.com/drive/1MTSBp9qbki6-uBNM2HH3M2Fc-qFOSSWl#scrollTo=z494Cl6XKUVX

[lmangani]

@djouallah the colab is not public, could you change its permissions or publish it as a gist? Seeing exactly how the tests executed is crucial to understanding the performance results.

[djouallah]

sorry, fixed :)

[auxten]

Also related #73