Datanode returns list of lists instead of dict.

[ea-rus]

Description

Fixes: #8728

If output from handler contains equal columns, for example if join different tables with the similar columns:

• Datanode returned dict which contents only one value for every duplicated column, the second value was lost
  Fixed:
• Return list of lists instead

Type of change

• 🐛 Bug fix (non-breaking change which fixes an issue)

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Checklist:

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