Struct TextIndexSignal 

pub struct TextIndexSignal {
    pub present: bool,
    pub bytes: u64,
    pub token_table_bytes: Option<u64>,
}

The file’s full-text-search affordance: does it carry a TEXT_INDEX section (kind 6), and what does that index cost?

A .rete built with --text-index answers FILTER(CONTAINS(…)) by word lookup; one built without it answers the same query with the same rows by full scan. The capability is invisible from the results, which is exactly how the playground catalog came to advertise an index two published files never carried (#189) — so a file has to be able to state it.

Measured at read time, never stored. The ground truth is the section directory in the 1 KiB header that every card read already fetches, so a stored copy would be a second source of truth for a fact the first source answers for free — the same reasoning that keeps a curated language field out of the card. Being a projection rather than a stamp also means every already-published file reports it today, with no re-card, and that rete repyramid --text-index (which rewrites the file’s sections) can never leave it stale.

What it deliberately does not carry: a token count. The number of distinct indexed words is the first varint of the decompressed token table, so quoting it would mean fetching and inflating the whole table — 193 MB on the published causenet-full-typed.rete. token_table_bytes is the same question answered for ≤10 bytes, and is the more useful answer anyway: it is what a first search actually costs.

Fields

present: bool

True iff the file has a kind-6 section. Always written, including as false: “measured, and there is none” is the fact #189 was missing.

bytes: u64

Byte length of the whole TEXT_INDEX section — free, straight from the header. Worth stating because it can dominate the download: causenet-full-typed.rete carries 1.88 GB of it, 29% of the file.

token_table_bytes: Option<u64>

Byte length of the section’s leading token table — the prefix a first search faults, several times smaller than bytes (which counts the postings blob, fetched one posting at a time). One ≤10-byte range read; None when there is no index, or its first bytes were unreadable.

Implementations

impl TextIndexSignal

pub fn probe<R: RangeReader + ?Sized>(reader: &R, header: &Header) -> Self

Measure the signal from a file’s header, through the same crate::RangeReader the card was read with. Costs nothing beyond the header already in hand when there is no index, and one ≤10-byte range read when there is — never the index itself.

pub fn describe(&self) -> String

One line for the human catalog view and the audit report.

Trait Implementations

impl Clone for TextIndexSignal

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TextIndexSignal

impl Debug for TextIndexSignal

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

Formats the value using the given formatter.

impl Default for TextIndexSignal

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TextIndexSignal

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for TextIndexSignal

impl PartialEq for TextIndexSignal

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for TextIndexSignal

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for TextIndexSignal