feat: add CsvDecoder to support streaming CSV parsing

[devin-ai-integration]

Add CsvDecoder to support streaming CSV parsing with configurable delimiter and encoding.

Link to Devin run: https://app.devin.ai/sessions/452c02a6b9e449ab863d5ad2747cc7b1
Requested by: natik@airbyte.io

[devin-ai-integration]

🤖 Devin AI Engineer

Original prompt from natik@airbyte.io:

Hey @Devin, can you please add a new Decoder to the Airbyte Python CDK (<https://github.com/airbytehq/airbyte-python-cdk>)?

More details on how and where you should add it:
• Start by defining the model in YAML component schema and regenerating the python classes:
    ◦ Add CsvDecoder everywhere where XmlDecoder is also supported
• CsvDecoder should support parameters for delimeter (default to ","), encoding (default to utf-8).
• Add code to model_to_component_factory to instanciate the CsvDecoder

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[Natik Gadzhi (natikgadzhi)]

This looks good, but you also need to add CsvDecoder as an option to all the spots in the schema that accept XmlDecoder as an option.

[Natik Gadzhi (natikgadzhi)]

CodeRabbit (@coderabbitai) review please?

[Natik Gadzhi (natikgadzhi)]

Aaron ("AJ") Steers (@aaronsteers) I'm not sure why CI checks don't seem to be in progress — anything I am missing? Do they want some form of human approval?

[coderabbitai]

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Get the PR diff to understand the changes
gh pr diff 321

# Look for any new CSV-related files
fd -e py csv

# Search for test files related to CSV
fd test.*csv

# Check if there are any documentation changes
fd -e md

Length of output: 81135

---

🏁 Script executed:

#!/bin/bash
# Get the CsvDecoder implementation
cat airbyte_cdk/sources/declarative/decoders/csv_decoder.py

# Check for tests
fd -t f "test.*csv.*" -t f "csv.*test.*"

Length of output: 2393

---

🏁 Script executed:

#!/bin/bash
# Look for test files in the entire codebase
fd test -t f

Length of output: 11993

---

🏁 Script executed:

#!/bin/bash
# Get the test file content
cat unit_tests/sources/declarative/decoders/test_csv_decoder.py

Length of output: 1303

---

Natik Gadzhi (@natikgadzhi) I've reviewed the PR. The implementation looks good with proper error handling and configurable options. Here's my feedback:

1. 👍 Good implementation features:

   • Configurable delimiter and encoding
   • Chunk-based streaming for memory efficiency
   • Proper error handling for empty/malformed data
   • CSV structure validation

2. 🔍 Suggestions for additional tests:

   • Test chunk-based streaming with large datasets
   • Test memory usage with large files
   • Test pandas-specific error cases (EmptyDataError, ParserError)
   • Test handling of different data types in CSV
   • Test handling of quoted values and escaping

3. 💡 Minor improvement suggestions:

   • Consider making chunk_size configurable through parameters
   • Add docstrings with examples
   • Consider adding validation for supported encodings

Would you like me to help with any of these suggestions? The code is ready to be used as is, but adding more tests would improve reliability.

(｀･ω･´)ゞ

✅ Actions performed

Review triggered.

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[coderabbitai]

Caution

Review failed

The head commit changed during the review from 695ac20 to 763f3a2.

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[Aaron ("AJ") Steers (aaronsteers)]

Natik Gadzhi (@natikgadzhi) - It seems recently GitHub introduced what seems like (indefensible, IMHO) behavior of not starting tests in there are conflicts. I think if you resolve those, tests should run again.

[Natik Gadzhi (natikgadzhi)]

/format-fix

[Natik Gadzhi (natikgadzhi)]

/autofix

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✅ Changes applied successfully.

[Natik Gadzhi (natikgadzhi)]

This has been superseded with Maxime Carbonneau-Leclerc (@maxi297)'s PR!

[Maxime Carbonneau-Leclerc (maxi297)]

This PR specifically: #326