[CALCITE-499] Estimate number of rows in ReflectiveSchema

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.0.0-incubating
• Labels: newbie
• Assignee: Unassigned
• Reporter: Vladimir Sitnikov
• Created: 01/Dec/14 06:59
• Updated: 22/Feb/19 01:19

Description

It would be nice if ReflectiveSchema could provide row estimates.
For arrays it is zero cost (Array.getLength(...).
For collections the invocation of .size() might be slow, however I am fine with both ways: return unknown or execute .size().