icydb-core 0.94.0

IcyDB — A schema-first typed query engine and persistence runtime for Internet Computer canisters
Documentation 
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//! Module: query::fingerprint
//! Responsibility: deterministic query-plan fingerprint/signature primitives.
//! Does not own: explain projection construction or query-plan validation.
//! Boundary: hash surface over planner-owned contracts for plan identity checks.

pub(crate) mod aggregate_hash;
pub(crate) mod fingerprint;
pub(crate) mod hash_parts;
pub(crate) mod projection_hash;
mod shape_signature;
#[cfg(test)]
mod tests;

use crate::db::codec::{finalize_hash_sha256, new_hash_sha256_prefixed};
use sha2::Sha256;

const PLAN_FINGERPRINT_PROFILE_TAG: &[u8] = b"planfp";
const CONTINUATION_SIGNATURE_PROFILE_TAG: &[u8] = b"contsig";

// Build one SHA256 stream pre-seeded with the plan fingerprint profile tag.
pub(in crate::db::query::fingerprint) fn new_plan_fingerprint_hasher() -> Sha256 {
    new_hash_sha256_prefixed(PLAN_FINGERPRINT_PROFILE_TAG)
}

// Build one SHA256 stream pre-seeded with the continuation-signature profile tag.
pub(in crate::db::query::fingerprint) fn new_continuation_signature_hasher() -> Sha256 {
    new_hash_sha256_prefixed(CONTINUATION_SIGNATURE_PROFILE_TAG)
}

// Finalize one SHA256 stream into a fixed-width fingerprint/signature payload.
pub(in crate::db::query::fingerprint) fn finalize_sha256_digest(hasher: Sha256) -> [u8; 32] {
    finalize_hash_sha256(hasher)
}