Add support for Iceberg table identifiers with special characters

[regadas]

This is a follow up PR to #33293 and #33575

proposal to address the performance issue by moving away from constant parsing and "stringified" TableIdentifier's making things a bit more type safe.

@ahmedabu98 @Abacn can you take look?

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[kennknowles]

R: @ahmedabu98

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[ahmedabu98]

Hey @regadas, I skimmed over this and noticed that a large portion of this PR includes changes that are not update compatible. In general for streaming pipelines we try not to change the PCollection element type (more importantly, the coder) unless it's really necessary. Otherwise, streaming pipelines will break when trying to update to the newer SDK version

It might be better to add a (static?) cache like @Abacn suggested

[regadas]

Hey @ahmedabu98 yup that is true; the reason I went for it was because:

1. this is a fairly new IO so probably not a lot of stuff running out there
2. I believe, the change is fundamentally a better approach enabling the usage of namespaces/table-names with special chars and supporting nested namespaces without requiring constant parsing.

That said, if you still feel caching is the best bet to add support for this then I'll make a new PR 👍

[chamikaramj]

Hi @regadas, thanks again for this and other contributions :)

To clarify, do the performance gains here come from eliminating per-element "TableIdentifier.parse(element.getKey())" calls or something else ?

Also, do you have any idea of perf gains received through this approach compared to a caching based approach ?

If pref gains are similar, I think it's preferable to not break update compatibility :)

Also, as a side note, we heavily discourage using Java serialization for coders.

[regadas]

Hello @chamikaramj Thanks glad to help 👍

To clarify, do the performance gains here come from eliminating per-element "TableIdentifier.parse(element.getKey())" calls or something else ?

yeah ... but with the proposal on #33293 things got a bit worse since parsing Json per element becomes very expensive;

If pref gains are similar, I think it's preferable to not break update compatibility :)

agree, tbh haven't done benchmark yet, let me get back to you on this

Also, as a side note, we heavily discourage using Java serialization for coders.

for good reasons 😄 , need to double check where TableIdentifierCoder is not used

[derrickaw]

Hi @regadas, friendly ping to revisit this PR. Thanks!

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