Import and modify analyze utility functions from 4.3
In the previous generation of analyze, gpdb provided features to merge
statistics such as MCVs (Most common values) and histograms for the root
or midlevel partitions from the leaf partition's statistics.
This commit imports the utility functions for merging MCVs and
histograms and modifies based on the needs of current version.
Signed-off-by: NBhunvesh Chaudhary <bchaudhary@pivotal.io>
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