fix: reduce conflicts between Spanner and BigQuery graph visualization on Colab

[ericfe-google]

…d Spanner. This avoids clashes if the same notebook uses visualizers for both BigQuery graphs and Spanner graphs, which can cause malfunctions in the visualizers.

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @ericfe-google, 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 resolves a potential naming conflict in Google Colab environments where BigQuery graph visualizers could clash with other visualizers, such as those for Spanner, if they used identical callback endpoint names. By introducing a "bigquery." prefix to the graph visualization callback names, this change ensures that BigQuery-specific visualizer functions are uniquely identified, preventing malfunctions and improving the robustness of interactive notebooks that integrate multiple data visualization tools.

Highlights

• Colab Callback Naming: Renamed output.register_callback endpoints for graph visualization from generic names (e.g., graph_visualization.Query) to bigquery.graph_visualization.Query and bigquery.graph_visualization.NodeExpansion to prevent naming conflicts.
• HTML Content Update: Modified the generated HTML content for the graph widget to reflect the new, prefixed callback names, ensuring consistency between registered callbacks and their usage in the frontend.

Changelog

• bigquery_magics/bigquery.py
  • Updated output.register_callback calls to use bigquery.graph_visualization.Query and bigquery.graph_visualization.NodeExpansion instead of the generic graph_visualization prefix.
  • Applied corresponding string replacements in the generated HTML content to match the new, unique callback names.

Activity

• No human activity (comments, reviews, etc.) has been provided for this pull request.

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[gemini-code-assist]

Code Review

This pull request makes the Colab endpoint names for graph visualization unique for BigQuery to avoid clashes with Spanner. The changes correctly update the callback registration and the generated HTML. My review includes one suggestion to improve maintainability by replacing duplicated hardcoded strings with constants.

[gemini-code-assist]

The callback names are hardcoded here and also when registering the callbacks on lines 683 and 685. To improve maintainability and prevent potential bugs if these names need to be changed in the future, it would be better to define these strings as constants at the module level and reuse them in all relevant places.

For example:

# At module level
_BQ_GRAPH_QUERY_CALLBACK = "bigquery.graph_visualization.Query"
_BQ_GRAPH_NODE_EXPANSION_CALLBACK = "bigquery.graph_visualization.NodeExpansion"
_SPANNER_GRAPH_QUERY_CALLBACK = "graph_visualization.Query"
_SPANNER_GRAPH_NODE_EXPANSION_CALLBACK = "graph_visualization.NodeExpansion"

# In _add_graph_widget()
...
output.register_callback(_BQ_GRAPH_QUERY_CALLBACK, _colab_query_callback)
...
html_content = html_content.replace(
    f'\"{_SPANNER_GRAPH_QUERY_CALLBACK}\"', f'\"{_BQ_GRAPH_QUERY_CALLBACK}\"'
)
...