Enum SkipDegradation 

pub enum SkipDegradation {
    TargetAbsent,
    TargetAtMatchStart,
}

Why a variable-targeted AFTER MATCH SKIP could not resume where the query asked, and which weaker strategy the resume position fell back to. Returned by SkipMode::next_pos next to the position instead of being reported here: this module stays pure (no error reporter, no executor types), and the executor — which owns the actor’s EvalErrorReport — decides what to do with it.

Variants

TargetAbsent

The target variable is bound to no row of the match, so there is no row to resume at. The scan resumed past the match’s last row, i.e. as SKIP PAST LAST ROW.

TargetAtMatchStart

The target resolves to the match’s own first row, so resuming there would re-find the same match forever. The scan resumed one row later, i.e. as SKIP TO NEXT ROW.

Implementations

impl SkipDegradation

pub fn describe(&self, skip: &SkipMode) -> String

The user-facing diagnostic for this degradation under skip: the target variable, what could not be resolved about it, and the strategy actually applied. The clause is not repeated here — the caller supplies it separately via SkipMode::clause_name, so the rendered message names the mode once (see report_skip_degradation_once in executor.rs).

Deliberately carries no row, match or partition identity: the cause is a property of the query, not of one row, which is what lets the executor report it once per watermark pass instead of once per match.

Trait Implementations

impl Clone for SkipDegradation

fn clone(&self) -> SkipDegradation

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SkipDegradation

impl Debug for SkipDegradation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for SkipDegradation

impl PartialEq for SkipDegradation

fn eq(&self, other: &SkipDegradation) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for SkipDegradation