perf-test: add simple test for thread subqueries

This is not a particularly sensible query, but thread:{date:2010} is a
good way to generate fairly large intermediate queries.

diff --git a/performance-test/T04-thread-subquery.sh b/performance-test/T04-thread-subquery.sh
new file mode 100755 (executable)
index 0000000..665d5a6
--- /dev/null
+++ b/performance-test/T04-thread-subquery.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+test_description='thread subqueries'
+
+. $(dirname "$0")/perf-test-lib.sh || exit 1
+
+time_start
+
+time_run "search thread:{} ..." "notmuch search thread:{date:2010} and thread:{from:linus}"
+time_run "search thread:{} ..." "notmuch search thread:{date:2010} and thread:{from:linus}"
+time_run "search thread:{} ..." "notmuch search thread:{date:2010} and thread:{from:linus}"
+
+time_done