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This commit adds support for the restore of extended statistics of the
kind "dependencies", for the following input data:
[{"attributes": [2], "dependency": 3, "degree": 1.000000},
{"attributes": [3], "dependency": 2, "degree": 1.000000}]
This relies on the existing routines of "dependencies" to cross-check
the input data with the definition of the extended statistics objects
for the attribute numbers. An input argument of type "pg_dependencies"
is required for this new option.
Thanks to the work done in
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