[IOTDB-695] Accelerate the count timeseries query

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.0
• Component/s: Core/Engine
• Labels: pull-request-available
• Assignee: Alima777
• Reporter: Jialin Qiao
• Created: 23/May/20 05:39
• Updated: 04/Jun/20 12:13
• Resolved: 04/Jun/20 12:13

Description

For count timeseries, we get all timeseries and then calculate the count. Which occupy much memory and not efficient. It's better to count while traversing the MTree.

Issue Links

• links to: GitHub Pull Request #1311