[IOTDB-2186] Optimization for fill query

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Fix Version/s: master branch
• Component/s: Core/Query
• Assignee: Yongzao Dan
• Reporter: Yuan Tian
• Created: 21/Dec/21 08:22
• Updated: 01/Jun/22 05:53
• Resolved: 01/Jun/22 05:53

Description

Currently, while doing fill query, like

`select s1 from root.sg1.d1 where time=100 fill(float[previous])`

we first do raw query for `select s1 from root.sg1.d1 where time=1` and then if the result is null, we will construct another last query for it.

However, we can use `select s1 from root.sg1.d1 where time <= 100 limit 1` to do that.