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Fix for bug #22077 "DROP TEMPORARY TABLE fails with wrong error if read_only is set"

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Do not issue a 'read-only' error in case of DROP TEMPORARY TABLE on a non-existing temporary table.
Instead produce the correct "Unknown table" error or warning (in cases when the IF EXISTS clause was specified).

To a documentor: the part of the manual describing the 'read_only' system variable should be clarified to state the following:
"When the read_only variable is set to ON, all operations which create/update/drop tables are rejected with the exceptions for:
1. Any operation performed by the replication thread on a slave server
2. Any operation performed by a user that have the SUPER privilege
3. Any operation that creates/updates/drops only temporary tables"
This commit is contained in:
kaa@polly.local
2006-11-20 17:35:23 +03:00
parent 8471897fbc
commit 346033a5da
3 changed files with 24 additions and 6 deletions
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13
sql/sql_parse.cc
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@@ -2515,12 +2515,13 @@ mysql_execute_command(THD *thd)
tables. Except for the replication thread and the 'super' users.
*/
if (opt_readonly &&
!(thd->security_ctx->master_access & SUPER_ACL) &&
uc_update_queries[lex->sql_command] &&
!((lex->sql_command == SQLCOM_CREATE_TABLE) &&
(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
some_non_temp_table_to_be_updated(thd, all_tables)))
!(thd->security_ctx->master_access & SUPER_ACL) &&
uc_update_queries[lex->sql_command] &&
!((lex->sql_command == SQLCOM_CREATE_TABLE) &&
(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
!((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) &&
((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
some_non_temp_table_to_be_updated(thd, all_tables)))
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
DBUG_RETURN(-1);