MDEV-21693 ALGORITHM=INSTANT does not work for partitioned tables

- Flag ALTER_STORED_COLUMN_TYPE set while doing varchar extension
for partition table. Basically all partition supports
can_be_converted_by_engine() then it should be set to
ALTER_COLUMN_TYPE_CHANGE_BY_ENGINE.

1 files changed, 35 insertions, 1 deletions

diff --git a/sql/ha_partition.cc b/sql/ha_partition.cc
index bcd419562b1..53bcd4df5c5 100644
--- a/sql/ha_partition.cc
+++ b/sql/ha_partition.cc
@@ -1,6 +1,6 @@
 /*
   Copyright (c) 2005, 2019, Oracle and/or its affiliates.
-  Copyright (c) 2009, 2019, MariaDB
+  Copyright (c) 2009, 2020, MariaDB
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -11799,6 +11799,40 @@ void ha_partition::clear_top_table_fields()
   DBUG_VOID_RETURN;
 }
 
+bool
+ha_partition::can_convert_string(const Field_string* field,
+		                 const Column_definition& new_type) const
+{
+  for (uint index= 0; index < m_tot_parts; index++)
+  {
+    if (!m_file[index]->can_convert_string(field, new_type))
+      return false;
+  }
+  return true;
+}
+
+bool
+ha_partition::can_convert_varstring(const Field_varstring* field,
+		                    const Column_definition& new_type) const{
+  for (uint index= 0; index < m_tot_parts; index++)
+  {
+    if (!m_file[index]->can_convert_varstring(field, new_type))
+      return false;
+  }
+  return true;
+}
+
+bool
+ha_partition::can_convert_blob(const Field_blob* field,
+		               const Column_definition& new_type) const
+{
+  for (uint index= 0; index < m_tot_parts; index++)
+  {
+    if (!m_file[index]->can_convert_blob(field, new_type))
+      return false;
+  }
+  return true;
+}
 
 struct st_mysql_storage_engine partition_storage_engine=
 { MYSQL_HANDLERTON_INTERFACE_VERSION };