MDEV-26262 frm is corrupted after ER_EXPRESSION_REFERS_TO_UNINIT_FIELD

This is a duplicate of MDEV-18278 89936f11e965, but I will add an
additional assertion

Description:

The frm corruption should not be reported during CREATE TABLE. Normally
it doesn't, and the data to fill TABLE is taken by open_table_from_share
call. However, the vcol data is stored as SQL string in
table->s->vcol_defs.str and is anyway parsed on each table open.
It is impossible [or hard] to avoid, because it's hard to clone the
expression tree in general (it's easier to parse).

Normally parse_vcol_defs should only fail on semantic errors. If so,
error_reported is set to true. Any other failure is not expected during
table creation. There is either unhandled/unacknowledged error, or
something went really wrong, like memory reject. This all should be
asserted anyway.

Solution:
* Set *error_reported=true for the forward references check;
* Assert for every unacknowledged error during table creation.

4 files changed, 26 insertions, 0 deletions

diff --git a/mysql-test/suite/gcol/inc/gcol_column_def_options.inc b/mysql-test/suite/gcol/inc/gcol_column_def_options.inc
index f4350d25ae9..17e926758ee 100644
--- a/mysql-test/suite/gcol/inc/gcol_column_def_options.inc
+++ b/mysql-test/suite/gcol/inc/gcol_column_def_options.inc
@@ -585,3 +585,14 @@ ALTER TABLE t1 ALTER COLUMN a SET DEFAULT 7,
 --disable_info
 DROP TABLE t1;
 --enable_warnings
+
+--echo #
+--echo # MDEV-26262 frm is corrupted after ER_EXPRESSION_REFERS_TO_UNINIT_FIELD
+--echo #
+
+--error ER_EXPRESSION_REFERS_TO_UNINIT_FIELD
+CREATE TABLE MDEV_26262 (a INT,b INT AS (b) VIRTUAL);
+
+--let SEARCH_FILE=$MYSQLTEST_VARDIR/log/mysqld.1.err
+--let SEARCH_PATTERN=Incorrect information in file: './test/MDEV_26262.frm'
+--source include/search_pattern_in_file.inc
diff --git a/mysql-test/suite/gcol/r/gcol_column_def_options_innodb.result b/mysql-test/suite/gcol/r/gcol_column_def_options_innodb.result
index 48c4613f6ca..2c0adc3d493 100644
--- a/mysql-test/suite/gcol/r/gcol_column_def_options_innodb.result
+++ b/mysql-test/suite/gcol/r/gcol_column_def_options_innodb.result
@@ -699,6 +699,12 @@ ADD COLUMN c INT AS (1 + DEFAULT(a)) VIRTUAL;
 affected rows: 1
 info: Records: 1  Duplicates: 0  Warnings: 0
 DROP TABLE t1;
+#
+# MDEV-26262 frm is corrupted after ER_EXPRESSION_REFERS_TO_UNINIT_FIELD
+#
+CREATE TABLE MDEV_26262 (a INT,b INT AS (b) VIRTUAL);
+ERROR 01000: Expression for field `b` is referring to uninitialized field `b`
+NOT FOUND /Incorrect information in file: './test/MDEV_26262.frm'/ in mysqld.1.err
 DROP VIEW  IF EXISTS v1,v2;
 DROP TABLE IF EXISTS t1,t2,t3;
 DROP PROCEDURE IF EXISTS p1;
diff --git a/mysql-test/suite/gcol/r/gcol_column_def_options_myisam.result b/mysql-test/suite/gcol/r/gcol_column_def_options_myisam.result
index b7ae6488c95..126a6c5e271 100644
--- a/mysql-test/suite/gcol/r/gcol_column_def_options_myisam.result
+++ b/mysql-test/suite/gcol/r/gcol_column_def_options_myisam.result
@@ -699,6 +699,12 @@ ADD COLUMN c INT AS (1 + DEFAULT(a)) VIRTUAL;
 affected rows: 1
 info: Records: 1  Duplicates: 0  Warnings: 0
 DROP TABLE t1;
+#
+# MDEV-26262 frm is corrupted after ER_EXPRESSION_REFERS_TO_UNINIT_FIELD
+#
+CREATE TABLE MDEV_26262 (a INT,b INT AS (b) VIRTUAL);
+ERROR 01000: Expression for field `b` is referring to uninitialized field `b`
+NOT FOUND /Incorrect information in file: './test/MDEV_26262.frm'/ in mysqld.1.err
 DROP VIEW  IF EXISTS v1,v2;
 DROP TABLE IF EXISTS t1,t2,t3;
 DROP PROCEDURE IF EXISTS p1;
diff --git a/sql/table.cc b/sql/table.cc
index d4f8170e0af..349d04a60ed 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -3282,6 +3282,9 @@ enum open_frm_error open_table_from_share(THD *thd, TABLE_SHARE *share,
                         &error_reported, mode))
     {
       error= OPEN_FRM_CORRUPTED;
+      // parse_vcol_defs may fail by semantic reasons, which is ok, but the
+      // real corruption should never be reported during table creation
+      DBUG_ASSERT(!is_create_table || !error_reported);
       goto err;
     }