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A patch for Bug#11763166 (55847: SHOW WARNINGS returns empty

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result set when SQLEXCEPTION is active.

The problem was in a hackish THD::no_warnings_for_error attribute.
When it was set, an error was not written to Warning_info -- only
Diagnostics_area state was changed. That means, Diagnostics_area
might contain error state, which is not present in Warning_info.

The user-visible problem was that in some cases SHOW WARNINGS
returned empty result set (i.e. there were no warnings) while
the previous SQL statement failed. According to the MySQL
protocol errors must be presented in warning list.

The main idea of this patch is to remove THD::no_warnings_for_error.
There were few places where it was used:
  - sql_admin.cc, handling of REPAIR TABLE USE_FRM.
  - sql_show.cc, when calling fill_schema_table_from_frm().
  - sql_show.cc, when calling fill_table().
The fix is to either use internal-error-handlers, or to use
temporary Warning_info storing warnings, which might be ignored.

This patch is needed to fix Bug 11763162 (55843).
This commit is contained in:
Alexander Nozdrin
2011-04-15 16:02:22 +04:00
parent 98d524599a
commit 060541c02e
12 changed files with 315 additions and 68 deletions
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13
sql/sql_class.cc
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@ -1,4 +1,4 @@
/* Copyright (C) 2000-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -11,8 +11,7 @@
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*****************************************************************************
**
@ -522,7 +521,7 @@ THD::THD()
#if defined(ENABLED_DEBUG_SYNC)
debug_sync_control(0),
#endif /* defined(ENABLED_DEBUG_SYNC) */
main_warning_info(0)
main_warning_info(0, false)
{
ulong tmp;
@ -581,7 +580,7 @@ THD::THD()
client_capabilities= 0; // minimalistic client
ull=0;
system_thread= NON_SYSTEM_THREAD;
cleanup_done= abort_on_warning= no_warnings_for_error= 0;
cleanup_done= abort_on_warning= 0;
peer_port= 0; // For SHOW PROCESSLIST
transaction.m_pending_rows_event= 0;
transaction.on= 1;
@ -854,10 +853,6 @@ MYSQL_ERROR* THD::raise_condition(uint sql_errno,
query_cache_abort(&query_cache_tls);
/* FIXME: broken special case */
if (no_warnings_for_error && (level == MYSQL_ERROR::WARN_LEVEL_ERROR))
DBUG_RETURN(NULL);
/* When simulating OOM, skip writing to error log to avoid mtr errors */
DBUG_EXECUTE_IF("simulate_out_of_memory", DBUG_RETURN(NULL););