Memory estimation#457

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Abhijeet-Boje wants to merge 3 commits intosnappy/masterfrom

memory-estimation

Commits on Dec 28, 2018

Added system procedure 'GET_TABLE_SIZE(tableName)'
Abhijeet
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Commits on Jan 1, 2019

Sampling external table into column table
Abhijeet
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Commits on Jan 2, 2019

updated procedure with java docs
Abhijeet
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