Replaced Sunburst Chart with Sankey Diagram Visualization Operator #2851
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… graph, where the edges are thicker if the edge weight is larger. Added sankey diagram scala code, registered the operator under LogicalOp, and added an icon under operator images.
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…2851) ### Purpose: This PR introduces a new visualization operator: **Sankey Diagram**. The Sankey Diagram visualizes flow in a directed graph, where the edges are thicker if the edge weight is larger. ### Changes: - Removed all Sunburst Chart files, which was a duplicate of Hierarchy Chart operator option. - Implemented the **Sankey Diagram** operator under `operators/visualization`. - Registered the Sankey Diagram in the `LogicalOp` array (located in `edu.uci.ics.texera.workflow.common.operators`). - Added a Sankey Diagram icon under the operator images. ### Testing Instructions: Use the following csv dataset: [CountryTrade.csv](https://github.com/user-attachments/files/17069734/CountryTrade.csv) It is a small directed graph representing countries import/export amounts. Open Texera workflow editor. Use the following operators: - Use the **CSV File Scan** operator to load the `CountryTrade.csv` file. - Use the **Sankey Diagram** operator with the source set to "from", target set to "to", and value set to "value". - Use the **HTML Visualizer** pointed at the HTML content produced by the Sankey Diagram operator. - Use the **View Results** operator to display the output. ### Expected Result:  
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Purpose:
This PR introduces a new visualization operator: Sankey Diagram. The Sankey Diagram visualizes flow in a directed graph, where the edges are thicker if the edge weight is larger.
Changes:
operators/visualization.LogicalOparray (located inedu.uci.ics.texera.workflow.common.operators).Testing Instructions:
Use the following csv dataset:
CountryTrade.csv
It is a small directed graph representing countries import/export amounts.
Open Texera workflow editor.
Use the following operators:
CountryTrade.csvfile.Expected Result: