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fix: force usage of msgs.starred column index

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link2xt
2025-02-28 06:05:09 +00:00
parent 43a40b9349
commit 7ef3884ced
1 changed files with 26 additions and 1 deletions
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27
src/message.rs
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@@ -1313,10 +1313,35 @@ impl Message {
/// UI can use this to show a symbol beside the message, indicating it was saved.
/// The message can be un-saved by deleting the returned message.
pub async fn get_saved_msg_id(&self, context: &Context) -> Result<Option<MsgId>> {
// We force usage of `msgs_index5` here
// which indexes `msgs.starred` column.
//
// Otherwise with SQLite 3.49.1
// if you run ANALYZE on the database,
// query planner decides not to use the index:
//
// sqlite> EXPLAIN QUERY PLAN SELECT id FROM msgs WHERE starred=? AND chat_id!=?;
// QUERY PLAN
// `--SEARCH msgs USING INDEX msgs_index5 (starred=?)
// sqlite> ANALYZE;
// sqlite> EXPLAIN QUERY PLAN SELECT id FROM msgs WHERE starred=? AND chat_id!=?;
// QUERY PLAN
// `--SCAN msgs
//
// Dropping created sqlite_stat1 and sqlite_stat4 tables
// and reconnecting helps.
//
// Even if we don't run ANALYZE or PRAGMA OPTIMIZE
// as of 2025-02-28, ANALYZE is supposed to improve performance
// and this demonstrates a bug in the query planner.
//
// Note that usage of INDEXED BY is generally discouraged,
// see <https://sqlite.org/lang_indexedby.html>
// and <https://sqlite.org/queryplanner-ng.html#howtofix>.
let res: Option<MsgId> = context
.sql
.query_get_value(
"SELECT id FROM msgs WHERE starred=? AND chat_id!=?",
"SELECT id FROM msgs INDEXED BY msgs_index5 WHERE starred=? AND chat_id!=?",
(self.id, DC_CHAT_ID_TRASH),
)
.await?;