From 1b2078b4d8aa64bad8bc2b3a201e0cf8c075e6a6 Mon Sep 17 00:00:00 2001 From: Sergei Golubchik Date: Tue, 15 May 2018 17:34:47 +0200 Subject: [PATCH] MDEV-15318 CREATE .. SELECT VALUES produces invalid table structure When Item_insert_value needs a dummy field, use zero-length Field_string, not Field_null. The latter isn't compatible with CREATE ... SELECT. --- mysql-test/r/insert_select.result | 9 +++++++++ mysql-test/t/insert_select.test | 10 ++++++++++ sql/item.cc | 8 ++++---- 3 files changed, 23 insertions(+), 4 deletions(-) diff --git a/mysql-test/r/insert_select.result b/mysql-test/r/insert_select.result index 8bfc4e9215e..157cc677d85 100644 --- a/mysql-test/r/insert_select.result +++ b/mysql-test/r/insert_select.result @@ -853,3 +853,12 @@ INSERT IGNORE INTO t1 SELECT t1.a FROM t1,t1 t2,t1 t3,t1 t4,t1 t5,t1 t6,t1 t7; SET GLOBAL myisam_data_pointer_size = @old_myisam_data_pointer_size; DROP TABLE t1; End of 5.1 tests +create table t1 (i int); +create table t2 as select values(i) as a from t1; +show create table t2; +Table Create Table +t2 CREATE TABLE `t2` ( + `a` binary(0) DEFAULT NULL +) ENGINE=MyISAM DEFAULT CHARSET=latin1 +drop table t1, t2; +End of 5.5 tests diff --git a/mysql-test/t/insert_select.test b/mysql-test/t/insert_select.test index bcd87c2688d..385e372bc3b 100644 --- a/mysql-test/t/insert_select.test +++ b/mysql-test/t/insert_select.test @@ -423,3 +423,13 @@ SET GLOBAL myisam_data_pointer_size = @old_myisam_data_pointer_size; DROP TABLE t1; --echo End of 5.1 tests + +# +# MDEV-15318 CREATE .. SELECT VALUES produces invalid table structure +# +create table t1 (i int); +create table t2 as select values(i) as a from t1; +show create table t2; +drop table t1, t2; + +--echo End of 5.5 tests diff --git a/sql/item.cc b/sql/item.cc index c5c6df0ec48..135255ee21e 100644 --- a/sql/item.cc +++ b/sql/item.cc @@ -8541,10 +8541,10 @@ bool Item_insert_value::fix_fields(THD *thd, Item **items) } else { - Field *tmp_field= field_arg->field; - /* charset doesn't matter here, it's to avoid sigsegv only */ - tmp_field= new Field_null(0, 0, Field::NONE, field_arg->field->field_name, - &my_charset_bin); + static uchar null_bit=1; + /* charset doesn't matter here */ + Field *tmp_field= new Field_string(0, 0, &null_bit, 1, Field::NONE, + field_arg->field->field_name, &my_charset_bin); if (tmp_field) { tmp_field->init(field_arg->field->table);