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Pre: expose read_partition_map from the db crate

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Grisha Kruglov 2018-07-25 11:30:21 -07:00 committed by Grisha Kruglov
parent 8c2245ff0b
commit 5bc6d76bb3
1 changed files with 5 additions and 2 deletions
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db/src/db.rs
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@ -472,8 +472,11 @@ pub(crate) fn read_materialized_view(conn: &rusqlite::Connection, table: &str) -
} }
/// Read the partition map materialized view from the given SQL store. /// Read the partition map materialized view from the given SQL store.
pub(crate) fn read_partition_map(conn: &rusqlite::Connection) -> Result<PartitionMap> { pub fn read_partition_map(conn: &rusqlite::Connection) -> Result<PartitionMap> {
// An obviously expensive query, but we only need to run it once. // An obviously expensive query, but we use it infrequently:
// - on first start,
// - while moving timelines,
// - during sync.
// First part of the union sprinkles 'allow_excision' into the 'parts' view. // First part of the union sprinkles 'allow_excision' into the 'parts' view.
// Second part of the union takes care of partitions which are known // Second part of the union takes care of partitions which are known
// but don't have any transactions. // but don't have any transactions.