[PHOENIX-1177] Cost-based query optimization - ASF JIRA

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1.	Gather and maintain stats for HBase tables in a designated HBase table	Resolved	ramkrishna.s.vasudevan
2.	Use stats to guide query parallelization	Closed	ramkrishna.s.vasudevan
3.	Perform partial scan for ANALYZE when table salted or local index	Closed	ramkrishna.s.vasudevan
4.	Only cache guideposts on physical PTable	Closed	ramkrishna.s.vasudevan
5.	Add StatisticsCollector to existing tables on first connection to cluster	Closed	ramkrishna.s.vasudevan
6.	Scan entire region when tenant-specific table is analyzed	Closed	ramkrishna.s.vasudevan
7.	Ensure Phoenix table is created for Local index and view index tables to store guideposts against them	Closed	James Taylor
8.	Update stats atomically	Closed	James Taylor
9.	Cleanup setting of timestamps when collecting and using stats	Closed	James Taylor
10.	Update ANALYZE syntax to collect stats on index tables and all tables	Closed	ramkrishna.s.vasudevan
11.	Add documentation for UPDATE STATISTICS command	Closed	ramkrishna.s.vasudevan
12.	Store statistics guideposts as VARBINARY	Closed	ramkrishna.s.vasudevan
13.	Collect row counts per region in stats table	Closed	ramkrishna.s.vasudevan
14.	Add unit test for stats not being maintained correctly through splits	Closed	ramkrishna.s.vasudevan
15.	Estimate byte count more accurately when split occurs	Resolved	Unassigned
16.	Collect row counts per tenant view	Resolved	Unassigned