fix: add missing crop function to _DATA_FILE_HELPER_LIB

[osushinekotan]

Fixes #4011

Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: [BUG]: NameError 'crop' is not defined when using optimize_data_file=True with CSV upload #4011

Problem:
When optimize_data_file=True is set on a CodeExecutor and a CSV file is uploaded, the auto-generated explore_df() function calls crop() which is not defined, causing a NameError.

Solution:
Add the crop function definition to _DATA_FILE_HELPER_LIB. The implementation is consistent with the existing crop function used elsewhere in the codebase.

Testing Plan

Manual End-to-End (E2E) Tests:

1. Create an agent with a CodeExecutor that has optimize_data_file=True
2. Upload a CSV file to the agent
3. Verify the preprocessing code executes without NameError

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

Additional context

The crop function definition added:

def crop(s: str, max_chars: int = 64) -> str:
  """Crops a string to max_chars characters."""
  return s[: max_chars - 3] + '...' if len(s) > max_chars else s

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[gemini-code-assist]

Summary of Changes

Hello @osushinekotan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical bug where the CodeExecutor would fail with a NameError when processing CSV files with data optimization enabled. The core issue was the explore_df() function attempting to use a crop() function that was not defined within its execution context. The fix involves embedding the necessary crop function directly into the _DATA_FILE_HELPER_LIB, thereby ensuring smooth and error-free data preprocessing for users leveraging this feature.

Highlights

• Bug Fix: Resolves a NameError that occurred when optimize_data_file=True was set on a CodeExecutor and a CSV file was uploaded, due to a missing crop() function call within explore_df().
• Function Addition: The crop utility function has been added to the _DATA_FILE_HELPER_LIB to ensure it's available when explore_df() is executed.
• Code Consistency: The newly added crop function's implementation is consistent with existing crop functions used elsewhere in the codebase.

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[adk-bot]

Response from ADK Triaging Agent

Hello @osushinekotan, thank you for your contribution!

Before we can merge this pull request, you'll need to sign the Contributor License Agreement (CLA). The cla/google check at the bottom of the PR is currently failing. Please visit https://cla.developers.google.com/ to sign the agreement.

Once the CLA is signed, we can proceed with the review. Thanks!

[gemini-code-assist]

Code Review

This pull request correctly fixes a NameError by adding the missing crop function to _DATA_FILE_HELPER_LIB. The change is straightforward and addresses the described issue. I've identified a minor bug in the implementation of the new crop function related to an edge case and have provided a suggestion to make it more robust.

[gemini-code-assist]

The current implementation of crop has a bug when max_chars is less than 3. For example, if s = 'abc' and max_chars = 2, the function returns 'ab...', which has a length of 5, exceeding the specified max_chars.

To ensure the cropped string never exceeds max_chars, the logic should handle small values of max_chars as a special case, for instance by truncating the string without adding an ellipsis.

Suggested change

	return s[: max_chars - 3] + '...' if len(s) > max_chars else s
	if len(s) <= max_chars:
	return s
	if max_chars >= 3:
	return s[:max_chars - 3] + '...'
	return s[:max_chars]

[osushinekotan]

Thanks for catching this! Fixed to handle small max_chars values.
b3b1382