[IOTDB-5364] Refactor Count TimeSeries Group By Level based on SchemaReader

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: master branch
• Labels: pull-request-available
• Sprint: 2023-1-Schema
• Assignee: Yukun Zhou
• Reporter: Yukun Zhou
• Created: 05/Jan/23 07:58
• Updated: 05/Jan/23 15:40
• Resolved: 05/Jan/23 15:40

Description

Currently, the LevelTimeSeriesCountOperator, serving feature "count timeseries group by level", is implemented by invoking SchemaRegion interfaces directly, which is unable to be interrupt and brings burden to SchemaRegion business logic.

Since we want SchemaRegion to only provide the basic SchemaReader, we refactor the implementation of LevelTimeSeriesCountOperator to extract the group by and counting logic from SchemaRegion. Based on SchemaReader, it is more flexible to interrupt the process and release resources.

Issue Links

• is a child of: IOTDB-3063 SchemaReader for schema query operator
• links to: GitHub Pull Request #8759