Module comparison 

Comparison Operations Kernels Module - High-Performance Element-wise Comparison Operations

Optimised comparison kernels providing comprehensive element-wise comparison operations across numeric, string, and categorical data types with SIMD acceleration and null-aware semantics. Foundation for filtering, conditional logic, and analytical query processing.

Core Operations

• Numeric comparisons: Equal, not equal, greater than, less than, greater/less than or equal
• String comparisons: UTF-8 aware lexicographic ordering with efficient prefix matching
• Categorical comparisons: Dictionary-encoded comparisons avoiding string materialisation
• Null-aware semantics: Proper three-valued logic handling (true/false/null)
• SIMD vectorisation: Hardware-accelerated bulk comparison operations
• Bitmask operations: Efficient boolean result representation using bit manipulation

Constants

W8

Auto-generated SIMD lane widths from build.rs SIMD lane count for 8-bit elements (u8, i8). Determined at build time based on target architecture capabilities, or overridden via SIMD_LANES_OVERRIDE.

W16

SIMD lane count for 16-bit elements (u16, i16). Determined at build time based on target architecture capabilities, or overridden via SIMD_LANES_OVERRIDE.

W32

SIMD lane count for 32-bit elements (u32, i32, f32). Determined at build time based on target architecture capabilities, or overridden via SIMD_LANES_OVERRIDE.

W64

SIMD lane count for 64-bit elements (u64, i64, f64). Determined at build time based on target architecture capabilities, or overridden via SIMD_LANES_OVERRIDE.

Functions

cmp_bitmask_simd

SIMD-accelerated compare bitmask

cmp_bool

Performs vectorised boolean array comparisons with null mask handling.

cmp_dict_dict

Compare UTF-8 string or dictionary arrays using the specified comparison operator.

cmp_dict_str

Compare UTF-8 string or dictionary arrays using the specified comparison operator.

cmp_f32

Type-specific SIMD-accelerated comparison function with vectorised operations.

cmp_f64

Type-specific SIMD-accelerated comparison function with vectorised operations.

cmp_i32

Type-specific SIMD-accelerated comparison function with vectorised operations.

cmp_i64

Type-specific SIMD-accelerated comparison function with vectorised operations.

cmp_numeric

Unified numeric comparison dispatch with optional null mask support.

cmp_str_dict

Compare UTF-8 string or dictionary arrays using the specified comparison operator.

cmp_str_str

Compare UTF-8 string or dictionary arrays using the specified comparison operator.

cmp_u32

Type-specific SIMD-accelerated comparison function with vectorised operations.

cmp_u64

Type-specific SIMD-accelerated comparison function with vectorised operations.