Revert "Add FixedString to PostgreSQL mapping"

[pamarcos]

Summary

Revert #3489 due to ClickHouse/ClickHouse#79108

PostgreSQL's CHARACTER type stores number of characters, while ClickHouse's FixedString stores number of bytes. Thus, that 1:1 mapping doesn't work for all encodings. That's the reason it wasn't done for MySQL. Since those types mean different things, I think it's rather misleading to map one to the other. The safest option is to map CHARACTER types that mean characters to String instead.

e.g. there might be a Japanese word of 4 characters but that uses 18 bytes

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 14, 2025 9:03am
clickhouse-docs-ru	❌ Failed (Inspect)			Apr 14, 2025 9:03am

2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs-jp	⬜️ Ignored (Inspect)			Apr 14, 2025 9:03am
clickhouse-docs-zh	⬜️ Ignored (Inspect)			Apr 14, 2025 9:03am

[pamarcos]

@Blargian any idea why the Deployment for Vercel failed? Is there any way to re-trigger that?
I don't have an account in Vercel and even if I did, I'm not sure I'd have permissions to see and re-trigger

[Blargian]

@pamarcos the translation sites are not deployed on every commit to main so they get out of sync. I can see it's failing on an unrelated change. Actually Vercel should not even try to deploy the Russian translation docs unless a change was made to those docs in this PR, so it seems something is not working as it should. Will take a look.

Merging this.

[pamarcos]

@pamarcos the translation sites are not deployed on every commit to main so they get out of sync. I can see it's failing on an unrelated change. Actually Vercel should not even try to deploy the Russian translation docs unless a change was made to those docs in this PR, so it seems something is not working as it should. Will take a look.

Merging this.

Thanks! 🤗
I did change the Russian doc slightly, though

[Blargian]

@pamarcos the translation sites are not deployed on every commit to main so they get out of sync. I can see it's failing on an unrelated change. Actually Vercel should not even try to deploy the Russian translation docs unless a change was made to those docs in this PR, so it seems something is not working as it should. Will take a look.
Merging this.

Thanks! 🤗 I did change the Russian doc slightly, though

Woops, missed that. No problem, I'll re-run translations for that page in a follow up PR.