Problem:
- When selecting only 1 value column in Pivot (long-to-wide), column names
were incorrectly formatted as 'FMA___('FMA', 'baseline')' instead of 'FMA___baseline'
- This occurred because pandas pivot_table() sometimes returns tuple column names
even for single value columns, but the code didn't handle this case
Root Cause:
- Line 112-127 in pivot.py assumed single value columns always have simple
string column names, without checking for tuples
- Multi-value column logic (line 129-145) correctly handled tuples with isinstance()
Solution:
- Add isinstance(col, tuple) check in single value column mode
- Extract pivot_value from tuple[1] if column name is a tuple
- Maintain backward compatibility for non-tuple column names
Testing:
- Single value column: FMA___ + tuple -> 'FMA___baseline' (fixed)
- Multiple value columns: Already working correctly (no change)
Impact: Fixes historical bug in Tool C Pivot feature
HaHafeng
6f5013e8ab