[SPARK-26982] Enhance describe framework to describe the output of a query

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Dilip Biswal
• Reporter: Dilip Biswal
• Created: 25/Feb/19 00:41
• Updated: 17/Apr/19 00:12
• Resolved: 02/Mar/19 03:24

Description

Currently we can use `df.printSchema` to discover the schema information for a query. We should have a way to describe the output schema of a query using SQL interface. 

 

Example:

DESCRIBE SELECT * FROM desc_table

DESCRIBE QUERY SELECT * FROM desc_table

Issue Links

• links to: GitHub Pull Request #23883
• links to: GitHub Pull Request #24385