Feature Summary

Texera workflows often involve exploring a dataset before applying cleaning, visualization, or analysis operators. A basic column-level summary operator would help users quickly understand the shape and quality of an input table.

This issue proposes adding a Column Summary Statistics workflow operator that takes one input table and outputs one summary row per input column.

Initial output fields:

• columnName
• dataType
• rowCount
• nullCount
• nonNullCount
• minValue
• maxValue
• meanValue

Proposed Solution or Design

For the first version:

• Numeric columns should report min, max, and mean.
• Non-numeric columns should report row/null/non-null counts and leave numeric summary fields null.
• The operator should follow existing Texera native operator patterns.
• Unit tests should cover numeric columns, non-numeric columns, null values, mixed columns, and empty input.

This is intended as a focused workflow operator for basic per-column summary statistics.

Affected Area

Workflow Engine (Amber)