services/horizon: Optimize claimable balances query to limit records …

…earlier (#4385)
stellar · May 19, 2022 · 156db13 · 156db13
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diff --git a/services/horizon/CHANGELOG.md b/services/horizon/CHANGELOG.md
@@ -3,6 +3,10 @@
 All notable changes to this project will be documented in this
 file. This project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unreleased
+
+- Querying claimable balances has been optimized ([4385](https://github.com/stellar/go/pull/4385)).
+
 ## V2.17.0
 
 This is the final release after the [release candidate](v2.17.0-release-candidate), including some small additional changes:

diff --git a/services/horizon/internal/db2/history/claimable_balances.go b/services/horizon/internal/db2/history/claimable_balances.go
@@ -220,7 +220,7 @@ func (q *Q) GetClaimableBalances(ctx context.Context, query ClaimableBalancesQue
 	sql = sql.
 		Prefix("WITH cb AS (").
 		Suffix(
-			") select "+claimableBalancesSelectStatement+" from cb LIMIT ?",
+			"LIMIT ?) select "+claimableBalancesSelectStatement+" from cb",
 			query.PageQuery.Limit,
 		)