database-cluster

Hi community,

This issue is for #11661

Aim

Add unit test for shardingsphere-shadow-core project to test its public functions.

Basic Qualifications

• Java
• Maven
• Junit.Test

Classes

Add unit test for classes to test its public functions.

• ShadowDataSourceConfigurationYamlSwapper
• ShadowTableConfigurationYamlSwapper
• ShadowRuleAlgorithmProviderConf

Overview of the Issue

vtexplain panics on SHOW TABLES and SHOW FULL TABLES

Reproduction Steps

Steps to reproduce this issue, example:

1. Deploy the following vschema.json:

{
    "ks1": {
        "sharded": true,
        "tables": {
            "user": {
                "column_vindexes": [
                    {
                        "column":