Yingwen

### What type of enhancement is this? Performance ### What does the enhancement do? The `LastNonNull` dedup strategy is slower than the default `LastRow` strategy, optimize it if possible ###...

Failed to open region: Empty region directory

2

### What type of bug is this? Crash ### What subsystems are affected? Distributed Cluster ### Minimal reproduce step 1. Create a table with multiple regions. 2. Drop the table...

GreptimeDB already has query tracing, we can support the `OPTIMIZER_TRACE` table later _Originally posted by @killme2008 in https://github.com/GreptimeTeam/greptimedb/pull/3060#discussion_r1438976027_

Memtable scan performance regression while time series amount < 100K

5

### What type of bug is this? Performance issue ### What subsystems are affected? Storage Engine ### Minimal reproduce step Use TSBS to generate some points with 4k hosts ```bash...

windows ci failed with STATUS_DLL_INIT_FAILED

8

### What type of bug is this? Unexpected error ### What subsystems are affected? Standalone mode ### Minimal reproduce step Run the nightly CI https://github.com/GreptimeTeam/greptimedb/actions/runs/9009678033/job/24754350747 ### What did you expect...

docs: add performance tuning tips

2

## What's Changed in this PR This document contains some tips for tuning GreptimeDB performance. ## Checklist - [ ] Please confirm that all corresponding versions of the documents have...

Query error: get stream from a distributed table

3

### What type of bug is this? Unexpected error ### What subsystems are affected? Distributed Cluster ### Minimal reproduce step 1. Create a table A with multiple regions under cluster...

### What problem does the new feature solve? The append-only table already supports getting the row count using statistics. However, when querying row count with filters, it's hard to use...

window_sort: Invalid range: Current batch have data on the left side of working range

1

### What type of bug is this? Crash ### What subsystems are affected? Standalone mode ### Minimal reproduce step This occurs in a user deployment: - Create a table -...

### What problem does the new feature solve? Sometimes we may want to configure the TCP keepalive idle for a connection in the Postgres or MySQL handler of GreptimeDB https://www.postgresql.org/docs/current/runtime-config-connection.html#RUNTIME-CONFIG-TCP-SETTINGS...