Function compute_schema_hash

nodedb-columnar/src/writer/encode.rs:52–61

Compute a simple schema hash for the footer.

(schema: &ColumnarSchema)

/// Compute a simple schema hash for the footer.
pub(super) fn compute_schema_hash(schema: &ColumnarSchema) -> u64 {
    use std::hash::{Hash, Hasher};
    // no-determinism: segment compaction footer hash, not Calvin write path; tracked for switch to xxhash with fixed seed
    let mut hasher = std::collections::hash_map::DefaultHasher::new();
    for col in &schema.columns {
        col.name.hash(&mut hasher);
        format!("{:?}", col.column_type).hash(&mut hasher);
    }
    hasher.finish()
}