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[SPARK-17073][SQL][FOLLOWUP] generate column-level statistics
## What changes were proposed in this pull request? This pr adds some test cases for statistics: case sensitive column names, non ascii column names, refresh table, and also improves some documentation. ## How was this patch tested? add test cases Author: wangzhenhua <wangzhenhua@huawei.com> Closes #15360 from wzhfy/colStats2.
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- sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzeColumnCommand.scala 29 additions, 24 deletions...he/spark/sql/execution/command/AnalyzeColumnCommand.scala
- sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala 2 additions, 1 deletion...rc/main/scala/org/apache/spark/sql/internal/SQLConf.scala
- sql/hive/src/test/scala/org/apache/spark/sql/hive/StatisticsSuite.scala 166 additions, 32 deletions...est/scala/org/apache/spark/sql/hive/StatisticsSuite.scala
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