[CALCITE-4223] Introducing column statistics to RelOptTable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.32.0
• Labels: pull-request-available
• Assignee: Chunwei Lei
• Reporter: Chunwei Lei
• Created: 03/Sep/20 07:35
• Updated: 10/Sep/22 08:40
• Resolved: 09/Aug/22 07:55

Description

Many systems depend on column statistics to compute more accurate stats, such as NDV, average column size, and so on. It would be nice if Calcite can provide such an interface.

Column statistics might include NDV, average/max column length, number of nulls, number of trues, number of falses and so on. 

What do you think?

 

Issue Links

• relates to: CALCITE-4215 Ensure org.apache.calcite.schema.Statistic uses null vs emptyList appropriately
• links to: GitHub Pull Request #2154
• links to: GitHub Pull Request #2845
• links to: PR#2845