[IOTDB-5347] Implement iterating query for devices and timeseries schema query

• 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: 04/Jan/23 02:49
• Updated: 04/Jan/23 08:48
• Resolved: 04/Jan/23 08:48

Description

Eliminate the origin implementation, which retrieves all result and return, by implementing iterating query based on SchemaReader in TimeSeriesSchemaScanOperator, DeviceSchemaScanOperator and PathsUsingTemplateSchemaScanOperator, with much less peak memory occupation.

Issue Links

• Blocked: IOTDB-3063 SchemaReader for schema query operator
• links to: GitHub Pull Request #8728