fn validate_comparison(
operand: &PersistedOperand,
other: &PersistedOperand,
changed_columns: &HashMap<String, (ConcreteDataType, ConcreteDataType)>,
region_id: RegionId,
) -> Result<()>fn validate_comparison(
operand: &PersistedOperand,
other: &PersistedOperand,
changed_columns: &HashMap<String, (ConcreteDataType, ConcreteDataType)>,
region_id: RegionId,
) -> Result<()>