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//! Hybrid query parsing (combining structured and vector search)
use super::super::ast::{FusionStrategy, HybridQuery, QueryExpr, VectorQuery};
use super::super::lexer::Token;
use super::error::ParseError;
use super::Parser;
impl<'a> Parser<'a> {
/// Parse HYBRID query combining structured and vector search
///
/// Syntax:
/// ```text
/// HYBRID
/// FROM table [WHERE ...] | MATCH pattern [WHERE ...]
/// VECTOR SEARCH collection
/// SIMILAR TO ...
/// FUSION RERANK(weight) | FILTER_THEN_SEARCH | SEARCH_THEN_FILTER | RRF(k) | INTERSECTION | UNION(sw, vw)
/// [LIMIT n]
/// ```
pub fn parse_hybrid_query(&mut self) -> Result<QueryExpr, ParseError> {
self.expect(Token::Hybrid)?;
// Parse structured part (table or graph query)
let structured = match self.peek() {
Token::From => {
// Table query or join
self.parse_from_query()?
}
Token::Match => self.parse_match_query()?,
Token::Select => self.parse_select_query()?,
other => {
return Err(ParseError::expected(
vec!["FROM", "MATCH", "SELECT"],
other,
self.position(),
));
}
};
// Parse vector part
self.expect(Token::Vector)?;
self.expect(Token::Search)?;
let collection = self.expect_ident()?;
self.expect(Token::Similar)?;
self.expect(Token::To)?;
let query_vector = self.parse_vector_source()?;
// Parse vector filter
let filter = if self.consume(&Token::Where)? {
Some(self.parse_metadata_filter()?)
} else {
None
};
// Parse optional metric
let metric = if self.consume(&Token::Metric)? {
Some(self.parse_distance_metric()?)
} else {
None
};
let vector = VectorQuery {
alias: None,
collection,
query_vector,
k: 10, // Will be overridden by limit
filter,
metric,
include_vectors: false,
include_metadata: true,
threshold: None,
};
// Parse fusion strategy
self.expect(Token::Fusion)?;
let fusion = self.parse_fusion_strategy()?;
// Parse limit
let limit = if self.consume(&Token::Limit)? {
Some(self.parse_integer()? as usize)
} else {
None
};
Ok(QueryExpr::Hybrid(HybridQuery {
alias: None,
structured: Box::new(structured),
vector,
fusion,
limit,
}))
}
/// Parse fusion strategy
fn parse_fusion_strategy(&mut self) -> Result<FusionStrategy, ParseError> {
match self.peek() {
Token::Rerank => {
self.advance()?;
// Optional weight in parentheses
let weight = if self.consume(&Token::LParen)? {
let w = self.parse_float()? as f32;
self.expect(Token::RParen)?;
w
} else {
0.5 // Default weight
};
Ok(FusionStrategy::Rerank { weight })
}
Token::Rrf => {
self.advance()?;
// Optional k in parentheses
let k = if self.consume(&Token::LParen)? {
let k = self.parse_integer()? as u32;
self.expect(Token::RParen)?;
k
} else {
60 // Default RRF k
};
Ok(FusionStrategy::RRF { k })
}
Token::Intersection => {
self.advance()?;
Ok(FusionStrategy::Intersection)
}
Token::Union => {
self.advance()?;
// Optional weights in parentheses
let (sw, vw) = if self.consume(&Token::LParen)? {
let sw = self.parse_float()? as f32;
self.expect(Token::Comma)?;
let vw = self.parse_float()? as f32;
self.expect(Token::RParen)?;
(sw, vw)
} else {
(0.5, 0.5) // Default equal weights
};
Ok(FusionStrategy::Union {
structured_weight: sw,
vector_weight: vw,
})
}
Token::Ident(name) => {
let name_upper = name.to_uppercase();
let name_clone = name.clone();
self.advance()?;
match name_upper.as_str() {
"FILTER_THEN_SEARCH" | "FILTERTHEN" => {
Ok(FusionStrategy::FilterThenSearch)
}
"SEARCH_THEN_FILTER" | "SEARCHTHEN" => {
Ok(FusionStrategy::SearchThenFilter)
}
"RERANK" => {
let weight = if self.consume(&Token::LParen)? {
let w = self.parse_float()? as f32;
self.expect(Token::RParen)?;
w
} else {
0.5
};
Ok(FusionStrategy::Rerank { weight })
}
_ => Err(ParseError::new(
// F-05: `name_clone` is caller-controlled identifier
// bytes. Render via `{:?}` so CR/LF/NUL/quotes are
// escaped before the message reaches the downstream
// JSON / audit / log / gRPC sinks.
format!("Unknown fusion strategy: {name_clone:?}. Valid: RERANK, RRF, FILTER_THEN_SEARCH, SEARCH_THEN_FILTER, INTERSECTION, UNION"),
self.position(),
)),
}
}
other => Err(ParseError::expected(
vec![
"RERANK",
"RRF",
"FILTER_THEN_SEARCH",
"SEARCH_THEN_FILTER",
"INTERSECTION",
"UNION",
],
other,
self.position(),
)),
}
}
}