SnowflakeIO yaml

[Amar3tto]

Fixes#28691

Adds Beam YAML support for Snowflake IO.

• Adds ReadFromSnowflake for batch reads from a table or query.
• Adds WriteToSnowflake for batch writes and streaming writes via Snowpipe.
• Supports password, OAuth, and private key authentication.
• Adds Beam Row / Snowflake schema conversion.
• Registers both transforms in standard_io.yaml.
• Adds unit tests for configuration, authentication, schema mapping, and batch/streaming behavior.

https://github.com/apache/beam/actions/runs/31692701363
https://github.com/apache/beam/actions/runs/31691059139

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[Abacn]

Prefer not introducing SuppressWarnings for new code

[Amar3tto]

Fixed

[Abacn]

Why not just make SnowflakeReadSchemaTransformProvider.Configuration as createDataSourceConfiguration's parameter?

[Amar3tto]

It is shared by both the read and write providers, which have different configuration classes. Passing the individual fields keeps this utility independent of either provider-specific configuration.

[Abacn]

return value is unused. I understand it's for validation. Consider add a comment noting it.

[Amar3tto]

Done

[github-actions]

Assigning reviewers:

R: @claudevdm for label python.
R: @kennknowles for label java.

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[derrickaw]

Hi @Amar3tto, can you add a yaml pipeline test under yaml/tests or yaml/extended_tests with any improvements necessary in integration_tests.py? Thanks.

[Amar3tto]

Hi @Amar3tto, can you add a yaml pipeline test under yaml/tests or yaml/extended_tests with any improvements necessary in integration_tests.py? Thanks.

Added a Snowflake YAML pipeline test under yaml/extended_tests/databases together with the required fixture in integration_tests.py.
Currently the existing Snowflake integration test is not run by CI and the YAML PostCommit does not provide Snowflake credentials/configuration either, so the test will be skipped until those are configured.

[Abacn]

Consider move this to postCommitYamlIntegrationTests. The test only need to be exercised on postsubmit time. The PreCommit becomes heavier as we are adding more expansion services (and test container). Same apply to kenesis / JmsIO / debezium