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perf: pull distinct to outermost SQL

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This commit is contained in:
Greg Heartsfield 2022-12-17 07:49:28 -06:00
parent 7a4c9266ec
commit 3c880b2f49
1 changed files with 3 additions and 4 deletions
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7
src/db.rs
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@ -428,14 +428,13 @@ fn query_from_filter(f: &ReqFilter) -> (String, Vec<Box<dyn ToSql>>) {
// if the filter is malformed, don't return anything. // if the filter is malformed, don't return anything.
if f.force_no_match { if f.force_no_match {
let empty_query = let empty_query = "SELECT e.content, e.created_at FROM event e WHERE 1=0".to_owned();
"SELECT DISTINCT(e.content), e.created_at FROM event e WHERE 1=0".to_owned();
// query parameters for SQLite // query parameters for SQLite
let empty_params: Vec<Box<dyn ToSql>> = vec![]; let empty_params: Vec<Box<dyn ToSql>> = vec![];
return (empty_query, empty_params); return (empty_query, empty_params);
} }
let mut query = "SELECT DISTINCT(e.content), e.created_at FROM event e".to_owned(); let mut query = "SELECT e.content, e.created_at FROM event e".to_owned();
// query parameters for SQLite // query parameters for SQLite
let mut params: Vec<Box<dyn ToSql>> = vec![]; let mut params: Vec<Box<dyn ToSql>> = vec![];
@ -591,7 +590,7 @@ fn query_from_sub(sub: &Subscription) -> (String, Vec<Box<dyn ToSql>>) {
// encapsulate subqueries into select statements // encapsulate subqueries into select statements
let subqueries_selects: Vec<String> = subqueries let subqueries_selects: Vec<String> = subqueries
.iter() .iter()
.map(|s| format!("SELECT content, created_at FROM ({})", s)) .map(|s| format!("SELECT distinct content, created_at FROM ({})", s))
.collect(); .collect();
let query: String = subqueries_selects.join(" UNION "); let query: String = subqueries_selects.join(" UNION ");
(query, params) (query, params)