[DRILL-7058] Refresh command to support subset of columns

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.16.0
• Component/s: Metadata
• Labels: doc-complete ready-to-commit
• Assignee: Venkata Jyothsna Donapati
• Reporter: Venkata Jyothsna Donapati
• Reviewer: Arina Ielchiieva
• Created: 26/Feb/19 21:28
• Updated: 02/May/19 22:52
• Resolved: 15/Mar/19 04:30

Description

Modify the REFRESH TABLE METADATA command to specify selected columns which are deemed interesting in some form - either sorted/partitioned/clustered by and column metadata will be stored only for those columns. The proposed syntax is 

  REFRESH TABLE METADATA  [ COLUMNS (list of columns) / NONE ]  <table path>

For example, REFRESH TABLE METADATA COLUMNS (age, salary) `/tmp/employee` stores column metadata only for the age and salary columns. REFRESH TABLE METADATA COLUMNS NONE `/tmp/employee` will not store column metadata for any column. 

By default, if the optional 'COLUMNS' clause is omitted, column metadata is collected for all the columns.  

 

Issue Links

• links to: GitHub Pull Request #1666