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MDEV-25327 Unexpected ER_DUP_ENTRY upon dropping PK column from system-versioned table

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When dropped all user key-parts we also drop key-parts of implicit system fields.
This commit is contained in:
Aleksey Midenkov
2021-04-13 23:56:49 +03:00
parent cc3105e100
commit 562bbf5212
3 changed files with 49 additions and 2 deletions
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12
sql/sql_table.cc
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@ -8451,7 +8451,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
key_parts.push_back(new (thd->mem_root) Key_part_spec(&cfield->field_name,
key_part_length, true),
thd->mem_root);
if (cfield->invisible < INVISIBLE_SYSTEM)
if (!(cfield->invisible == INVISIBLE_SYSTEM && cfield->vers_sys_field()))
user_keyparts= true;
}
if (table->s->tmp_table == NO_TMP_TABLE)
@ -8463,6 +8463,14 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
(void) delete_statistics_for_index(thd, table, key_info, TRUE);
}
if (!user_keyparts && key_parts.elements)
{
/*
If we dropped all user key-parts we also drop implicit system fields.
*/
key_parts.empty();
}
if (key_parts.elements)
{
KEY_CREATE_INFO key_create_info;
@ -8496,7 +8504,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
key_type= Key::PRIMARY;
else
key_type= Key::UNIQUE;
if (dropped_key_part && user_keyparts)
if (dropped_key_part)
{
my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), dropped_key_part);
goto err;