[jira] [Created] (DRILL-7138) Implement command to show schema for table

["Arina Ielchiieva (JIRA)" <ji...@apache.org>]

Arina Ielchiieva created DRILL-7138:
---------------------------------------

             Summary: Implement command to show schema for table
                 Key: DRILL-7138
                 URL: https://issues.apache.org/jira/browse/DRILL-7138
             Project: Apache Drill
          Issue Type: Sub-task
            Reporter: Arina Ielchiieva
            Assignee: Arina Ielchiieva
             Fix For: 1.16.0


As part of schema provisioning project, it will be handy for the user to see if table has schema and its content. 
Command syntax:

*describe schema for table dfs.tmp.`text_table`*

By default schema will be output in JSON format (format schema is stored in .drill.schema file):

{noformat}
{
  "table" : "dfs.tmp.`text_table`",
  "schema" : {
    "columns" : [
      {
        "name" : "id",
        "type" : "INT",
        "mode" : "OPTIONAL"
      }
    ]
  },
  "version" : 1
}
{noformat}

JSON format can be indicated explicitly:

*describe schema for table dfs.tmp.`text_table` as JSON*

Other formats:
STATEMENT - schema will be output in the form of CREATE SCHEMA statement.




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