From 0b9fedc38f58ae613750aec91720e2ad83463916 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Sat, 6 Jan 2024 15:24:10 -0800
Subject: [PATCH] Fixed error with auto_explain - fixes #48

---
 CHANGELOG.md          | 1 +
 lib/dexter/indexer.rb | 2 +-
 lib/dexter/query.rb   | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c818c9a7..be7d661c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 0.5.2 (unreleased)
 
 - Switched to `GENERIC_PLAN` for Postgres 16
+- Fixed error with `auto_explain`
 - Fixed warning with Ruby 3.3
 
 ## 0.5.1 (2023-05-27)
diff --git a/lib/dexter/indexer.rb b/lib/dexter/indexer.rb
index 119aee22..dded3e0d 100644
--- a/lib/dexter/indexer.rb
+++ b/lib/dexter/indexer.rb
@@ -185,7 +185,7 @@ def create_hypothetical_indexes(queries)
 
       # get initial costs for queries
       calculate_plan(queries)
-      explainable_queries = queries.select { |q| q.explainable? && q.high_cost? }
+      explainable_queries = queries.select { |q| q.plans.any? && q.high_cost? }
 
       # filter tables for performance
       tables = Set.new(explainable_queries.flat_map(&:tables))
diff --git a/lib/dexter/query.rb b/lib/dexter/query.rb
index 6585603e..fea4a123 100644
--- a/lib/dexter/query.rb
+++ b/lib/dexter/query.rb
@@ -31,7 +31,7 @@ def tree
     end
 
     def explainable?
-      plans.any?
+      plans.size >= 3
     end
 
     def costs