Github user lianhuiwang commented on the pull request:
https://github.com/apache/spark/pull/4207#issuecomment-71633632
firstly,we need to rename title of PR to [SPARK-5324][SQL] Implement
Describe Table for SQLContext. i find that code of this PR is not the latest
code. i donot agree that move DescribeCommand to a class of SparkPlan. it keep
to be a class of LogicalPlan.
in Hive Context, it have implemented DescribeHiveTableCommand of SparkPlan.
so in SQL Context, we just need to implement a SparkPlan like
DescribeHiveTableCommand of Hive Context. and in CommandStrategy of
SparkStrategies will translate Describe's LogicalPlan to SparkPlan.
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