From d8acaf2181517a2a8d065821a1d0e2074a8668ad Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 8 Jul 2015 12:12:44 +0200
Subject: [PATCH] Index BuildSteps on propagatedFrom

This significantly speeds up deleting Builds, since it removes the
need for a sequential scan on BuildSteps.
---
 src/sql/hydra.sql      | 1 +
 src/sql/upgrade-36.sql | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 src/sql/upgrade-36.sql

diff --git a/src/sql/hydra.sql b/src/sql/hydra.sql
index 1ade4e38..8752bacc 100644
--- a/src/sql/hydra.sql
+++ b/src/sql/hydra.sql
@@ -594,6 +594,7 @@ create index IndexBuildProducstOnBuildAndType on BuildProducts(build, type);
 create index IndexBuildProductsOnBuild on BuildProducts(build);
 create index IndexBuildStepsOnBusy on BuildSteps(busy) where busy = 1;
 create index IndexBuildStepsOnDrvPath on BuildSteps(drvpath);
+create index IndexBuildStepsOnPropagatedFrom on BuildSteps(propagatedFrom) where propagatedFrom is not null;
 create index IndexBuildStepOutputsOnPath on BuildStepOutputs(path);
 create index IndexBuildsOnFinished on Builds(finished) where finished = 0;
 create index IndexBuildsOnFinishedBusy on Builds(finished, busy) where finished = 0;
diff --git a/src/sql/upgrade-36.sql b/src/sql/upgrade-36.sql
new file mode 100644
index 00000000..876c1c87
--- /dev/null
+++ b/src/sql/upgrade-36.sql
@@ -0,0 +1 @@
+create index IndexBuildStepsOnPropagatedFrom on BuildSteps(propagatedFrom) where propagatedFrom is not null;