diff --git a/quickwit/quickwit-metastore/migrations/postgresql/16_create-index-split-uid.down.sql b/quickwit/quickwit-metastore/migrations/postgresql/16_create-index-split-uid.down.sql
new file mode 100644
index 00000000000..b66140c350a
--- /dev/null
+++ b/quickwit/quickwit-metastore/migrations/postgresql/16_create-index-split-uid.down.sql
@@ -0,0 +1 @@
+DROP INDEX IF EXISTS splits_index_uid_idx;
diff --git a/quickwit/quickwit-metastore/migrations/postgresql/16_create-index-split-uid.up.sql b/quickwit/quickwit-metastore/migrations/postgresql/16_create-index-split-uid.up.sql
new file mode 100644
index 00000000000..9b9b1c14060
--- /dev/null
+++ b/quickwit/quickwit-metastore/migrations/postgresql/16_create-index-split-uid.up.sql
@@ -0,0 +1 @@
+CREATE INDEX IF NOT EXISTS splits_index_uid_idx ON splits USING HASH(index_uid);
diff --git a/quickwit/quickwit-metastore/src/metastore/postgres/metastore.rs b/quickwit/quickwit-metastore/src/metastore/postgres/metastore.rs
index d1270c71bee..8667ded3f1f 100644
--- a/quickwit/quickwit-metastore/src/metastore/postgres/metastore.rs
+++ b/quickwit/quickwit-metastore/src/metastore/postgres/metastore.rs
@@ -1667,7 +1667,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "split_state" IN ('Staged')"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "split_state" IN ('Staged')"#
             )
         );
 
@@ -1681,7 +1681,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "split_state" IN ('Published')"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "split_state" IN ('Published')"#
             )
         );
 
@@ -1694,7 +1694,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "split_state" IN ('Published', 'MarkedForDeletion')"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "split_state" IN ('Published', 'MarkedForDeletion')"#
             )
         );
 
@@ -1706,7 +1706,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "update_timestamp" < TO_TIMESTAMP(51)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "update_timestamp" < TO_TIMESTAMP(51)"#
             )
         );
 
@@ -1718,7 +1718,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "create_timestamp" <= TO_TIMESTAMP(55)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "create_timestamp" <= TO_TIMESTAMP(55)"#
             )
         );
 
@@ -1733,7 +1733,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND ("maturity_timestamp" = TO_TIMESTAMP(0) OR "maturity_timestamp" <= TO_TIMESTAMP(55))"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND ("maturity_timestamp" = TO_TIMESTAMP(0) OR "maturity_timestamp" <= TO_TIMESTAMP(55))"#
             )
         );
 
@@ -1746,7 +1746,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "maturity_timestamp" > TO_TIMESTAMP(55)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "maturity_timestamp" > TO_TIMESTAMP(55)"#
             )
         );
 
@@ -1758,7 +1758,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "delete_opstamp" >= 4"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "delete_opstamp" >= 4"#
             )
         );
 
@@ -1770,7 +1770,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND ("time_range_end" > 45 OR "time_range_end" IS NULL)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND ("time_range_end" > 45 OR "time_range_end" IS NULL)"#
             )
         );
 
@@ -1782,7 +1782,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND ("time_range_start" < 45 OR "time_range_start" IS NULL)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND ("time_range_start" < 45 OR "time_range_start" IS NULL)"#
             )
         );
 
@@ -1799,7 +1799,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND (NOT ($$tag-2$$ = ANY(tags)))"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND (NOT ($$tag-2$$ = ANY(tags)))"#
             )
         );
 
@@ -1812,7 +1812,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' ORDER BY "split_id" ASC OFFSET 4"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') ORDER BY "split_id" ASC OFFSET 4"#
             )
         );
     }
@@ -1830,7 +1830,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND ("time_range_end" > 0 OR "time_range_end" IS NULL) AND ("time_range_start" < 40 OR "time_range_start" IS NULL)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND ("time_range_end" > 0 OR "time_range_end" IS NULL) AND ("time_range_start" < 40 OR "time_range_start" IS NULL)"#
             )
         );
 
@@ -1844,7 +1844,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND ("time_range_end" > 45 OR "time_range_end" IS NULL) AND "delete_opstamp" > 0"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND ("time_range_end" > 45 OR "time_range_end" IS NULL) AND "delete_opstamp" > 0"#
             )
         );
 
@@ -1858,7 +1858,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND "update_timestamp" < TO_TIMESTAMP(51) AND "create_timestamp" <= TO_TIMESTAMP(63)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND "update_timestamp" < TO_TIMESTAMP(51) AND "create_timestamp" <= TO_TIMESTAMP(63)"#
             )
         );
 
@@ -1875,7 +1875,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' AND ($$tag-1$$ = ANY(tags)) AND ("time_range_end" > 90 OR "time_range_end" IS NULL)"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}') AND ($$tag-1$$ = ANY(tags)) AND ("time_range_end" > 90 OR "time_range_end" IS NULL)"#
             )
         );
 
@@ -1890,7 +1890,7 @@ mod tests {
         assert_eq!(
             sql.to_string(PostgresQueryBuilder),
             format!(
-                r#"SELECT * FROM "splits" WHERE "index_uid" = '{index_uid}' OR "index_uid" = '{index_uid_2}'"#
+                r#"SELECT * FROM "splits" WHERE "index_uid" IN ('{index_uid}', '{index_uid_2}')"#
             )
         );
     }
diff --git a/quickwit/quickwit-metastore/src/metastore/postgres/utils.rs b/quickwit/quickwit-metastore/src/metastore/postgres/utils.rs
index 7f08b77ea08..4fcc0319a6a 100644
--- a/quickwit/quickwit-metastore/src/metastore/postgres/utils.rs
+++ b/quickwit/quickwit-metastore/src/metastore/postgres/utils.rs
@@ -24,7 +24,7 @@ use std::time::Duration;
 
 use quickwit_common::uri::Uri;
 use quickwit_proto::metastore::{MetastoreError, MetastoreResult};
-use sea_query::{any, Cond, Expr, Func, Order, SelectStatement};
+use sea_query::{any, Expr, Func, Order, SelectStatement};
 use sqlx::postgres::{PgConnectOptions, PgPoolOptions};
 use sqlx::{ConnectOptions, Pool, Postgres};
 use tracing::error;
@@ -93,13 +93,9 @@ pub(super) fn append_range_filters<V: Display>(
 pub(super) fn append_query_filters(sql: &mut SelectStatement, query: &ListSplitsQuery) {
     // Note: `ListSplitsQuery` builder enforces a non empty `index_uids` list.
 
-    let or_condition = query
-        .index_uids
-        .iter()
-        .fold(Cond::any(), |cond, index_uid| {
-            cond.add(Expr::col(Splits::IndexUid).eq(Expr::val(index_uid.to_string())))
-        });
-    sql.cond_where(or_condition);
+    sql.cond_where(
+        Expr::col(Splits::IndexUid).is_in(query.index_uids.iter().map(|val| val.to_string())),
+    );
 
     if !query.split_states.is_empty() {
         sql.cond_where(