From 3189c38185c05a6f0e6dbad7e9ae2d96f5f8f547 Mon Sep 17 00:00:00 2001
From: Mateusz Gajewski <mateusz.gajewski@gmail.com>
Date: Wed, 23 Mar 2022 15:14:24 +0100
Subject: [PATCH] Improve testing MySQL's stats quality

---
 .../test/java/io/trino/plugin/mysql/TestingMySqlServer.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/plugin/trino-mysql/src/test/java/io/trino/plugin/mysql/TestingMySqlServer.java b/plugin/trino-mysql/src/test/java/io/trino/plugin/mysql/TestingMySqlServer.java
index d8b788174e74..99346482dade 100644
--- a/plugin/trino-mysql/src/test/java/io/trino/plugin/mysql/TestingMySqlServer.java
+++ b/plugin/trino-mysql/src/test/java/io/trino/plugin/mysql/TestingMySqlServer.java
@@ -59,7 +59,11 @@ public TestingMySqlServer(String dockerImageName, boolean globalTransactionEnabl
         execute(format("GRANT ALL PRIVILEGES ON *.* TO '%s'", container.getUsername()), "root", container.getPassword());
     }
 
-    protected void configureContainer(MySQLContainer<?> container) {}
+    private void configureContainer(MySQLContainer<?> container)
+    {
+        // MySQL configuration provided by default by testcontainers causes MySQL to produce poor estimates in CARDINALITY column of INFORMATION_SCHEMA.STATISTICS table.
+        container.addParameter("TC_MY_CNF", null);
+    }
 
     public Connection createConnection()
             throws SQLException