Support HerdDB database

[eolivelli]

• Add HerdDB JDBC driver (works for tests, accessing a standalone server, accessing a cluster, running the server in the same process of the backend)
• Change all of the DELETE statements to use a syntax supported by Apache Calcite (SQL interpreter of HerdDB)
• Use time_stamp in SQL, and getTimestamp() in beans (there is no way to have a unique sintax to escape keyword 'timestamp' that works for MySQL/HerdDB and PostGre)
• Run tests with HerdDB instead of SQLLite
• add demo configuration for HerdDB
• upgrade Lombok

[eolivelli]

@tuteng I still have a failing test so this patch is not ready to go.

I also have a bad problem with the aliases 'timestamp', that is not supported by Apache Calcite.
When we were MySQL-friendly we could use the 'accent' escape of MySQL (´) but I think this is not supported by PostGres.
I think you used all the 'AS' syntaxes in order to map 1:1 the query to the java beans without renaming timestamp to time_stamp every where in the frontend.

I am trying to find a fix, byt if you have an idea about how to fix it please chime in

cc @sijie

[sijie]

@eolivelli what is the difference between #183 and this one?

[eolivelli]

@sijie I had to start from scratch because of too many conflicts as the schema changes dramatically and so every SQL query was rewritten.
The only big addition is that I have moved the tests to HerdDB.

[eolivelli]

@sijie @tuteng all tests are passing.
The frontend seems to work even if I have renamed 'timestamp' to 'time_stamp' on every Stat bean.
I tried to check for direct usages of property "frontend" in the JS code but I did not find any explicit reference.

[eolivelli]

I had to upgrade Lombok in order to make my IDE happy, I can revert that part of the change

[eolivelli]

this is now the default

[eolivelli]

this is in-memory only

[eolivelli]

@sijie @tuteng the patch is good to go

[sijie]

The change looks good to me. @tuteng can you please also take a look?

[tuteng]

@eolivelli Thank you very much for your contribution. There is no problem with the tests on my side. It works very well. Is it convenient for you to add some instructions on the default test database to this document https://github.com/streamnative/pulsar-manager/blob/master/src/README.md?

Similar to the following:

Default Test database HerdDB

Introduction

A brief introduction

Document Link: herddb-link