[DRILL-7138] Implement command to describe schema for table

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.16.0
• Labels: doc-impacting ready-to-commit
• Assignee: Arina Ielchiieva
• Reporter: Arina Ielchiieva
• Reviewer: Vova Vysotskyi
• Created: 28/Mar/19 11:10
• Updated: 29/Mar/19 14:50
• Resolved: 29/Mar/19 14:50

Description

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):

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

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.
describe schema for table dfs.tmp.`text_table` as statement

Issue Links

• links to: GitHub Pull Request #1719