GitHub user yanbohappy opened a pull request:
https://github.com/apache/spark/pull/4207
Implement Describe Table for SQLContext
Initial code snippet for Describe Table command.
#1 SQL Parser and generate logical plan. Add "DESCRIBE [FORMATTED]
[db_name.]table_name" command parser in SparkSQLParser and generate the same
logical plan for both SQLContext and HiveContext.
(note: HiveContext also support "DESCRIBE [FORMATTED] [db_name.]table_name
PARTITION partition_column_name" and "DESCRIBE [FORMATTED] [db_name.]table_name
column_name" is implement by Hive native command)
#2 Implement DescribeCommand which invoke by RunnableCommand.
#3 For SQLContext the code is clearly structured, but for HiveContext the
output of describe command need to stay the same Hive. So For HiveContext, we
still transfer logical command to DescribeHiveTableCommand which had been
implement in HiveStrategies.HiveCommandStrategy.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yanbohappy/spark spark-5324
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4207.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #4207
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commit 7fb2e81d682d8f641275077b94dfb6d7de466de8
Author: Yanbo Liang <[email protected]>
Date: 2015-01-26T15:29:10Z
Implement Describe Table for SQLContext
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