fix: avoid message mistakenly appended (#46)

## Rationale
Current implementation will append multiple error message together.

## Detailed Changes
- Fix broken CI, rename `CeresdbError` to `Error`.
- Only append error message when old message is empty. 

## Test Plan
CI
5 files changed
tree: 660cb9c3b3bd4bc7a2753aef33aaba5d0ad95e8a
  1. .github/
  2. ceresdb/
  3. examples/
  4. test/
  5. tools/
  6. .gitignore
  7. .golangci.yml
  8. CHANGELOG.md
  9. go.mod
  10. go.sum
  11. LICENSE
  12. Makefile
  13. README.md
  14. revive.toml
README.md

CeresDB Golang Client

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Introduction

Golang client for CeresDB.

Support features

  • DDL, such as create/alter table
  • Write and query support in both standalone and cluster mode

How To Use

Please refer Golang SDK docs.

License

Under Apache License 2.0.

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