From bf6f0f03cfafcbe99b38bba08ff1da2a876b845e Mon Sep 17 00:00:00 2001
From: Matteo Scaramuccia <moodle@matteoscaramuccia.com>
Date: Mon, 4 Sep 2017 00:34:12 +0200
Subject: [PATCH] MDL-59596 ddl: Support MariaDB 10.2.4+ SQL_MODE new default
 value.

---
 lib/ddl/mysql_sql_generator.php | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/ddl/mysql_sql_generator.php b/lib/ddl/mysql_sql_generator.php
index 1933f69df21..e9f44185787 100644
--- a/lib/ddl/mysql_sql_generator.php
+++ b/lib/ddl/mysql_sql_generator.php
@@ -321,6 +321,27 @@ class mysql_sql_generator extends sql_generator {
         return $sqls;
     }
 
+    public function getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause = NULL, $skip_default_clause = NULL, $skip_notnull_clause = NULL)
+    {
+        $tablename = $xmldb_table->getName();
+        $dbcolumnsinfo = $this->mdb->get_columns($tablename);
+
+        if (($this->mdb->has_breaking_change_sqlmode()) &&
+            ($dbcolumnsinfo[$xmldb_field->getName()]->meta_type == 'X') &&
+            ($xmldb_field->getType() == XMLDB_TYPE_INTEGER)) {
+            // Ignore 1292 ER_TRUNCATED_WRONG_VALUE Truncated incorrect INTEGER value: '%s'.
+            $altercolumnsqlorig = $this->alter_column_sql;
+            $this->alter_column_sql = str_replace('ALTER TABLE', 'ALTER IGNORE TABLE', $this->alter_column_sql);
+            $result = parent::getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause, $skip_default_clause, $skip_notnull_clause);
+            // Restore the original ALTER SQL statement pattern.
+            $this->alter_column_sql = $altercolumnsqlorig;
+
+            return $result;
+        }
+
+        return parent::getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause, $skip_default_clause, $skip_notnull_clause);
+    }
+
     /**
      * Given one correct xmldb_table, returns the SQL statements
      * to create temporary table (inside one array).