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use MAX, add arrival_index index

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This commit is contained in:
Aaron Blankstein
2020-07-10 09:53:07 -05:00
parent fd819305f6
commit d1e6a22704
1 changed files with 2 additions and 1 deletions
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3
src/chainstate/burn/db/burndb.rs
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@@ -361,6 +361,7 @@ const BURNDB_SETUP : &'static [&'static str]= &[
CREATE UNIQUE INDEX snapshots_block_hashes ON snapshots(block_height,index_root,winning_stacks_block_hash);
CREATE UNIQUE INDEX snapshots_block_stacks_hashes ON snapshots(num_sortitions,index_root,winning_stacks_block_hash);
CREATE INDEX block_arrivals ON snapshots(arrival_index,burn_header_hash);
CREATE INDEX arrival_indexes ON snapshots(arrival_index);
"#,
r#"
-- all leader keys registered in the blockchain.
@@ -1383,7 +1384,7 @@ impl SortitionDB {
/// Get the maximum arrival index for any known snapshot.
fn get_max_arrival_index(conn: &Connection) -> Result<u64, db_error> {
match conn.query_row("SELECT arrival_index FROM snapshots ORDER BY arrival_index DESC LIMIT 1", NO_PARAMS,
match conn.query_row("SELECT MAX(arrival_index) FROM snapshots", NO_PARAMS,
|row| u64::from_column(row, "arrival_index"))
.optional()? {
Some(arrival_index) => Ok(arrival_index?),