MDEV-20498 Assertion `table_share->tmp_table != NO_TMP_TABLE || m_lock_type == 1' failed upon REBUILD PARTITION.

Alexey Botchkov · Alexey Botchkov · commit f32dc93faafe · 2025-10-21T10:13:42.000+04:00
Subpartition field list can be NULL. So keep the function null-safe.
diff --git a/sql/sql_partition.cc b/sql/sql_partition.cc
@@ -4800,6 +4800,9 @@ static void check_datadir_altered_for_innodb(THD *thd,
 
 static bool check_name_in_fields(const Field * const *fields, const char *name)
 {
+  if (!fields)
+    return FALSE;
+
   for (; *fields; fields++)
   {
     if (my_strcasecmp(system_charset_info,

Original file line number	Diff line number	Diff line change
`@@ -4800,6 +4800,9 @@ static void check_datadir_altered_for_innodb(THD *thd,`
`4800`	`4800`
`4801`	`4801`	`static bool check_name_in_fields(const Field * const fields, const char name)`
`4802`	`4802`	`{`
	`4803`	`+ if (!fields)`
	`4804`	`+ return FALSE;`
	`4805`	`+`
`4803`	`4806`	`for (; *fields; fields++)`
`4804`	`4807`	`{`
`4805`	`4808`	`if (my_strcasecmp(system_charset_info,`