Asserting correct database name lettercase in

various places in the code.

sql/events.cc

@@ -596,6 +596,8 @@ Events::drop_schema_events(THD *thd, char *db)
   DBUG_ENTER("Events::drop_schema_events");
   DBUG_PRINT("enter", ("dropping events from %s", db));
 
+  DBUG_ASSERT(ok_for_lower_case_names(db));
+
   /*
     Sic: no check if the scheduler is disabled or system tables
     are damaged, as intended.

sql/lock.cc

@@ -860,6 +860,8 @@ bool lock_object_name(THD *thd, MDL_key::enum_mdl_namespace mdl_type,
   MDL_request schema_request;
   MDL_request mdl_request;
 
+  DBUG_ASSERT(ok_for_lower_case_names(db));
+
   if (thd->locked_tables_mode)
   {
     my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,

sql/mdl.h

@@ -37,6 +37,7 @@ class THD;
 class MDL_context;
 class MDL_lock;
 class MDL_ticket;
+bool  ok_for_lower_case_names(const char *name);
 
 /**
   @def ENTER_COND(C, M, S, O)
@@ -350,6 +351,7 @@ class MDL_key
                                           NAME_LEN) - m_ptr + 1);
     m_hash_value= my_hash_sort(&my_charset_bin, (uchar*) m_ptr + 1,
                                m_length - 1);
+    DBUG_ASSERT(ok_for_lower_case_names(db));
   }
   void mdl_key_init(const MDL_key *rhs)
   {

sql/sp.cc

@@ -1437,6 +1437,8 @@ bool lock_db_routines(THD *thd, char *db)
   uchar keybuf[MAX_KEY_LENGTH];
   DBUG_ENTER("lock_db_routines");
 
+  DBUG_ASSERT(ok_for_lower_case_names(db));
+
   /*
     mysql.proc will be re-opened during deletion, so we can ignore
     errors when opening the table here. The error handler is

sql/sp_head.cc

@@ -493,6 +493,7 @@ sp_name::init_qname(THD *thd)
           (int) m_db.length, (m_db.length ? m_db.str : ""),
           dot, ".",
           (int) m_name.length, m_name.str);
+  DBUG_ASSERT(ok_for_lower_case_names(m_db.str));
 }
 
 

sql/sql_cache.cc

@@ -2306,6 +2306,8 @@ void Query_cache::invalidate(THD *thd, char *db)
   if (is_disabled())
     DBUG_VOID_RETURN;
 
+  DBUG_ASSERT(ok_for_lower_case_names(db));
+
   bool restart= FALSE;
   /*
     Lock the query cache and queue all invalidation attempts to avoid

sql/table.cc

@@ -3436,6 +3436,24 @@ uint calculate_key_len(TABLE *table, uint key, const uchar *buf,
   return length;
 }
 
+#ifndef DBUG_OFF
+/**
+  Verifies that database/table name is in lowercase, when it should be
+
+  This is supposed to be used only inside DBUG_ASSERT()
+*/
+bool ok_for_lower_case_names(const char *name)
+{
+  if (!lower_case_table_names || !name)
+    return true;
+
+  char buf[SAFE_NAME_LEN];
+  strmake_buf(buf, name);
+  my_casedn_str(files_charset_info, buf);
+  return strcmp(name, buf) == 0;
+}
+#endif
+
 /*
   Check if database name is valid
 

sql/table.h

@@ -2511,6 +2511,8 @@ static inline void dbug_tmp_restore_column_maps(MY_BITMAP *read_set,
 #endif
 }
 
+bool ok_for_lower_case_names(const char *names);
+
 enum get_table_share_flags {
   GTS_TABLE                = 1,
   GTS_VIEW                 = 2,