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# Enhancement: Gluten Advanced Cost-based Query Optimization (Advanced CBO)
## Background
Many of developers may already noticed that Apache Spark's Catalyst query planner basically heuristicall…
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Previous Release Notes:
[Release Note 1.2.7](https://github.com/apache/doris/issues/23711)
[Release Note 2.0-beta](https://github.com/apache/doris/issues/21059)
We are excited to announce the r…
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Previous Release Notes:
[Release Note 1.2.6](https://github.com/apache/doris/issues/21805)
[Release Note 2.0-alpha](https://github.com/apache/doris/issues/19231)
We are excited to announce the …
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## Enhancement
I ran the [`deadcode`](https://go.dev/blog/deadcode) tool in tidb:
```
rm tools/check/*
deadcode -test -tags intest ./...
```
It'll give you:
```
❯ deadcode -test -tags …
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### Is your feature request related to a problem or challenge?
Whilst working on #8540 I was surprised to see removing unbounded causing the DataFusion optimizer to not remove the `SortExec` from the…
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**Describe the problem**
After executing extensive DDL from a file via the \i command in `cockroach sql`, the `USE` statement does not work.
I reproduced this on both my laptop (Mac) and GCE.
…
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## Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
1. What did you do?
If possible, provide a recipe for reproducing the error.
```
create table …
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I'm considering trying myself to implement a Cascades/[Columbia](http://web.cecs.pdx.edu/~len/Columbia/#ref) top down optimizer using Egg and was wondering if anyone else was already trying.
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Hi,
I've been looking at writing a general purpose SQL query optimizer on top of egg. Are you aware of anyone else trying to do so? I'd prefer not starting from scratch. Egg looks very close to wha…
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I will continue the discussion here, until or if @keean can get Github to restore the thread. Luckily I still have a copy of the deleted #35 thread loaded, so I can copy and paste from it. If the orig…