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merge with 5.1

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This commit is contained in:
Michael Widenius
2010-11-30 23:11:03 +02:00
parent b2e979d868 6f279f4014
commit 1e5061fe3b
524 changed files with 11683 additions and 5759 deletions
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46
sql/sql_update.cc
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@@ -25,9 +25,26 @@
#include "sql_trigger.h"
#include "debug_sync.h"
/* Return 0 if row hasn't changed */
bool compare_record(TABLE *table)
/**
True if the table's input and output record buffers are comparable using
compare_record(TABLE*).
*/
bool records_are_comparable(const TABLE *table) {
return ((table->file->ha_table_flags() & HA_PARTIAL_COLUMN_READ) == 0) ||
bitmap_is_subset(table->write_set, table->read_set);
}
/**
Compares the input and outbut record buffers of the table to see if a row
has changed.
@return true if row has changed.
@return false otherwise.
*/
bool compare_record(const TABLE *table)
{
if (table->s->can_cmp_whole_record)
return cmp_record(table,record[1]);
@@ -583,9 +600,7 @@ int mysql_update(THD *thd,
the table handler is returning all columns OR if
if all updated columns are read
*/
can_compare_record= (!(table->file->ha_table_flags() &
HA_PARTIAL_COLUMN_READ) ||
bitmap_is_subset(table->write_set, table->read_set));
can_compare_record= records_are_comparable(table);
while (!(error=info.read_record(&info)) && !thd->killed)
{
@@ -1697,18 +1712,16 @@ bool multi_update::send_data(List<Item> &not_used_values)
if (table->status & (STATUS_NULL_ROW | STATUS_UPDATED))
continue;
/*
We can use compare_record() to optimize away updates if
the table handler is returning all columns OR if
if all updated columns are read
*/
if (table == table_to_update)
{
/*
We can use compare_record() to optimize away updates if
the table handler is returning all columns OR if
if all updated columns are read
*/
bool can_compare_record;
can_compare_record= (!(table->file->ha_table_flags() &
HA_PARTIAL_COLUMN_READ) ||
bitmap_is_subset(table->write_set,
table->read_set));
can_compare_record= records_are_comparable(table);
table->status|= STATUS_UPDATED;
store_record(table,record[1]);
if (fill_record_n_invoke_before_triggers(thd, *fields_for_table[offset],
@@ -1959,10 +1972,7 @@ int multi_update::do_updates()
goto err;
}
can_compare_record= (!(table->file->ha_table_flags() &
HA_PARTIAL_COLUMN_READ) ||
bitmap_is_subset(table->write_set,
table->read_set));
can_compare_record= records_are_comparable(table);
for (;;)
{