Bug#33327093 FK: assertion failure in row_MySQL_pad_col

Analysis
--------
1. The parent table has 3 column of datatype (i) int (PK) (ii) varchar
   (iii) a virtual column which is generated by varchar column.
2. The child table has a column which is referring to the primary key
   of the parent table.
3. There is a update in the parent table which changes the primary key
   and the varchar column, so it tries to build the update node to
   propagate to the child table.
4. While building the update node it is trying to build the update
   field for virtual column which is causing the crash.

FIX
===
1. The virtual column update should not be present in the update node,
   because no column in child table can have a foreign key
   relationship with a virtual column.

2. So skip the update to the virtual column when building the update node
   for child table

Change-Id: Iff7d1f32c7c9d846453c587fc0c5b8604ec679ec

Author: Aditya A

storage/innobase/include/data0data.h

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1994, 2023, Oracle and/or its affiliates.
+Copyright (c) 1994, 2024, Oracle and/or its affiliates.
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License, version 2.0,
@@ -596,6 +596,10 @@ struct dfield_t{
 				created.
 	@return	the cloned object. */
 	dfield_t* clone(mem_heap_t* heap);
+
+	/** Checks if the field is virtual
+	@return	true if virtual else returns false. */
+	bool is_virtual() const { return (type.is_virtual()); }
 };
 
 /** Structure for an SQL data tuple of fields (logical record) */

storage/innobase/include/data0type.h

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1996, 2023, Oracle and/or its affiliates.
+Copyright (c) 1996, 2024, Oracle and/or its affiliates.
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License, version 2.0,
@@ -587,6 +587,8 @@ struct dtype_t{
 					mbminlen=DATA_MBMINLEN(mbminmaxlen);
 					mbmaxlen=DATA_MBMINLEN(mbminmaxlen) */
 #endif /* !UNIV_HOTBACKUP */
+
+	bool is_virtual() const { return ((prtype & DATA_VIRTUAL) == DATA_VIRTUAL); }
 };
 
 #ifndef UNIV_NONINL

storage/innobase/include/row0upd.h

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1996, 2023, Oracle and/or its affiliates.
+Copyright (c) 1996, 2024, Oracle and/or its affiliates.
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License, version 2.0,
@@ -460,6 +460,9 @@ struct upd_field_t{
 #endif /* !UNIV_HOTBACKUP */
 	dfield_t	new_val;	/*!< new value for the column */
 	dfield_t*	old_v_val;	/*!< old value for the virtual column */
+
+	bool is_virtual() const { return (new_val.is_virtual()); }
+
 };
 
 

storage/innobase/row/row0ins.cc

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1996, 2023, Oracle and/or its affiliates.
+Copyright (c) 1996, 2024, Oracle and/or its affiliates.
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License, version 2.0,
@@ -552,6 +552,11 @@ row_ins_cascade_calc_update_vec(
 			const upd_field_t*	parent_ufield
 				= &parent_update->fields[j];
 
+			/* Skip if the updated field is virtual */
+			if (parent_ufield->is_virtual()) {
+				continue;
+			}
+
 			if (parent_ufield->field_no == parent_field_no) {
 
 				ulint			min_size;