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------------------------------------------------------------ revno: 2572.2.1 revision-id: sp1r-davi@mysql.com/endora.local-20080227225948-16317 parent: sp1r-anozdrin/alik@quad.-20080226165712-10409 committer: davi@mysql.com/endora.local timestamp: Wed 2008-02-27 19:59:48 -0300 message: Bug#27525 table not found when using multi-table-deletes with aliases over several databas Bug#30234 Unexpected behavior using DELETE with AS and USING The multi-delete statement has a documented limitation that cross-database multiple-table deletes using aliases are not supported because it fails to find the tables by alias if it belongs to a different database. The problem is that when building the list of tables to delete from, if a database name is not specified (maybe an alias) it defaults to the name of the current selected database, making impossible to to properly resolve tables by alias later. Another problem is a inconsistency of the multiple table delete syntax that permits ambiguities in a delete statement (aliases that refer to multiple different tables or vice-versa). The first step for a solution and proper implementation of the cross-databse multiple table delete is to get rid of any ambiguities in a multiple table statement. Currently, the parser is accepting multiple table delete statements that have no obvious meaning, such as: DELETE a1 FROM db1.t1 AS a1, db2.t2 AS a1; DELETE a1 AS a1 FROM db1.t1 AS a1, db2.t2 AS a1; The solution is to resolve the left part of a delete statement using the right part, if the a table on right has an alias, it must be referenced in the left using the given alias. Also, each table on the left side must match unambiguously only one table in the right side. mysql-test/r/delete.result: Add test case result for Bug#27525 and Bug#21148 mysql-test/r/derived.result: Update error. mysql-test/suite/rpl/r/rpl_multi_delete2.result: Update syntax. mysql-test/suite/rpl/t/rpl_multi_delete2.test: Update syntax. mysql-test/t/delete.test: Add test case for Bug#27525 and Bug#21148 mysql-test/t/derived.test: Update statement error, alias is properly resolved now. sql/sql_parse.cc: Implement new algorithm for the resolution of alias in a multiple table delete statement. sql/sql_yacc.yy: Rework multi-delete parser rules to not accept table alias for the table source list. sql/table.h: Add flag to signal that the table has a alias set or that fully qualified table name was given.
44 lines
972 B
Text
44 lines
972 B
Text
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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set sql_log_bin=0;
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create database mysqltest_from;
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set sql_log_bin=1;
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create database mysqltest_to;
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use mysqltest_from;
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drop table if exists a;
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CREATE TABLE a (i INT);
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INSERT INTO a VALUES(1);
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DELETE alias FROM a alias WHERE alias.i=1;
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SELECT * FROM a;
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i
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insert into a values(2),(3);
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delete alias FROM a alias where alias.i=2;
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select * from a;
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i
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3
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use mysqltest_to;
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select * from a;
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i
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3
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create table t1 (a int primary key);
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create table t2 (a int);
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insert into t1 values (1);
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insert into t2 values (1);
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delete t1.* from t1, t2 where t1.a = t2.a;
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select * from t1;
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a
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select * from t2;
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a
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1
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select * from t1;
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ERROR 42S02: Table 'mysqltest_to.t1' doesn't exist
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select * from t2;
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ERROR 42S02: Table 'mysqltest_to.t2' doesn't exist
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set sql_log_bin=0;
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drop database mysqltest_from;
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set sql_log_bin=1;
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drop database mysqltest_to;
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