Struct SchemaStabilityTracker 

pub struct SchemaStabilityTracker { /* private fields */ }

Tracks consecutive rows where the schema (column types) has not changed. Used by engines to implement SchemaStable stop conditions.

Accepts a fingerprint (hash) of the column types and accumulates rows across chunks. When the accumulated stable-row count reaches the threshold, the tracker signals that profiling may stop.

Implementations

impl SchemaStabilityTracker

pub fn from_condition(condition: &StopCondition) -> Option<Self>

Create a tracker for the given threshold. Returns None if no SchemaStable condition is present.

pub fn update(&mut self, fingerprint: u64, chunk_rows: u64) -> bool

Update with the current schema fingerprint and the number of rows in the chunk. Returns true when the accumulated stable-row count reaches the threshold.

pub fn truncation_reason(&self) -> TruncationReason

The truncation reason when schema stability is reached.