Function apply_cmp_str 

pub fn apply_cmp_str<T: Integer>(
    lhs: StringAVT<'_, T>,
    rhs: StringAVT<'_, T>,
    op: ComparisonOperator,
) -> Result<BooleanArray<()>, KernelError>

Applies comparison operations between corresponding string elements from string arrays.

Performs element-wise string comparison using lexicographic ordering with UTF-8 awareness and efficient null handling.

Parameters

• lhs: Left-hand string array view tuple (StringArray, offset, length)
• rhs: Right-hand string array view tuple (StringArray, offset, length)
• op: Comparison operator (Eq, Ne, Lt, Le, Gt, Ge, In, NotIn)

String Comparison

• Uses Rust’s standard UTF-8 aware lexicographic ordering
• Null strings handled consistently across all operations
• Set operations support string membership testing

Returns

Result<BooleanArray<()>, KernelError> where true elements satisfy the comparison.

Performance

• Optimised string comparison avoiding unnecessary allocations
• Efficient null mask processing with bitwise operations
• Dictionary-style operations for set membership testing