distributed-database

etcd depends on gobin (https://github.com/myitcv/gobin) that since go 1.16 can get replaced with go run $pkg@$version:

Please refactor the scripts to use upstream go run:

scripts/test_lib.sh:# Ensure gobin is available, as it runs majority of the tools
scripts/test_lib.sh:if ! command -v "gobin" >/dev/null; then
scripts/test_lib.sh:    GOARCH="" run env GO111MODULE=off go get git

lightning v5.3.0

After the content in parquet may be written by spark, the definition of bool is true or false. Regenerating the parquet file takes time, In tidb, bool behaves as tinyint, so proper type conversion will help improve the success rate of lightning import

parquet file：
![image](https://user-images.githubusercontent.com/21033020/147809823-214dcb34-0e10-4566-aa75-2109c0525144

The array overlap operator, &&, provides a convenient syntax for filtering for arrays that have one more more elements in common with another array. However, the && operator is not index accelerated, so an efficient inverted index scan in not planned. The current workaround is to rewrite the query by combining the containment operator with OR expressions:

CREATE TABLE movies (
  

We create a number of threads in various places in our code, and in most cases we do not give these threads names. It could be helpful to have names that make it easier for us to see what a thread is doing. Some examples include:

1. The network thread created by bindings (some bindings name this thread, others do not)
2. External network threads (name proposed in #6033)
3. Trace logging threa

On recent versions, yb-admin ysql_catalog_version keeps returning zero even after catalog changes. This is because it uses CatalogManager::GetYsqlCatalogConfig which reads from the legacy protobuf catalog version, not the pg_yb_catalog_version system table. Fix yb-admin to get the version from the correct source.

The current test TestCassandraConnectorTest has some issues:

• Unrelated types in a table
• The definition and data are managed in the different class
• Less coverage in a type

It would be nice to introduce type mapping tests.

Use case:
Add the ability to search for an element in an array and retrieve back the array index.
As per the PostgreSQL documentation:

array_position ( anycompatiblearray, anycompatible [, integer ] ) → integer

Returns the subscript of the first occurrence of the second argument in the array, or NULL if it's not present

we should delete files:

be/src/common/hdfs.h

Welcome newcomers to solve this issue

Currently we don't have any mechanism to limit the maximum number of clients that could be handled simultaneously.

This feature should be designed properly. Here is some clue: https://redis.io/topics/clients#maximum-number-of-clients

Now that we support more than 1 data type, we should include the values data type in cache nodes. This give us a way of easily identifying what type of data a key points to e.g. string, queue (and more types in the future)

Currently a cache node object consists of a Key, a Value and a TTL. We should also add a field specifying the type of the Value