fix some problems when enable automatic index
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Key: HIVE-2728
URL: https://issues.apache.org/jira/browse/HIVE-2728
Project: Hive
Issue Type: Improvement
Reporter: He Yongqiang
Assignee: He Yongqiang
while adding a new testcase in HIVE-2727, i found that the current auto index
can be more aggressive. And also i doubt that there is count(1) query which
should not go to index, but actually uses index.
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