THD::>save_prep_leaf_list was set to true by multi-table update
statements with mergeable selects and never reset.
Make every statement reset it at start.
IS REJECTED.
Analysis
========
View creation with named columns over UNION is rejected.
Consider the following view definition:
CREATE VIEW v1 (fld1, fld2) AS SELECT 1 AS a, 2 AS b
UNION ALL SELECT 1 AS a, 1 AS a;
A 'duplicate column' error was reported due to the duplicate
alias name in the secondary SELECT. The VIEW column names
are either explicitly specified or determined from the
first SELECT (which can be auto generated if not specified).
Since a duplicate column name check was performed even
for the secondary SELECTs, an error was reported.
Fix
====
Check for duplicate column names only for the named
columns if specified or only for the first SELECT.
Do not use merge_for_insert for commands which use SELECT because optimizer can't work with such tables.
Fixes which makes multi-delete working with normally merged views.
~40% bugfixed(*) applied
~40$ bugfixed reverted (incorrect or we're not buggy)
~20% bugfixed applied, despite us being not buggy
(*) only changes in the server code, e.g. not cmakefiles
It is triple bug with one test suite:
1. Incorrect outer table detection
2. Incorrect leaf table processing for multi-update (should be full like for usual updates and inserts)
3. ON condition fix_fields() fould be called for all tables of the query.
- MDEV-5587 Server crashes in Locked_tables_list::restore_lock on CREATE OR REPLACE .. SELECT under LOCK
- MDEV-5586 Assertion `share->tdc.all_tables.is_empty() || remove_type != TDC_RT_REMOVE_ALL' fails in tdc_remove_table
- MDEV-5588 Strange error on CREATE OR REPLACE table over an existing view
mysql-test/r/create_or_replace.result:
Added test cases
mysql-test/r/lowercase_view.result:
New error message
mysql-test/r/merge.result:
New error message
mysql-test/r/multi_update.result:
New error message
mysql-test/r/subselect.result:
New error message
mysql-test/r/subselect_exists_to_in.result:
New error message
mysql-test/r/subselect_no_mat.result:
New error message
mysql-test/r/subselect_no_opts.result:
New error message
mysql-test/r/subselect_no_scache.result:
New error message
mysql-test/r/subselect_no_semijoin.result:
New error message
mysql-test/r/view.result:
New error message
mysql-test/suite/funcs_1/r/myisam_views-big.result:
New error message
mysql-test/t/create_or_replace.test:
New tests
mysql-test/t/view.test:
New error message
sql/share/errmsg-utf8.txt:
Added new error message
sql/sql_base.cc:
Updated error message
Do an automatic UNLOCK TABLES if we don't have any locked tables (safety fix)
sql/sql_db.cc:
Updated arguments
sql/sql_load.cc:
New error message
sql/sql_parse.cc:
Check that we are not using a table we are dropping and re-creating
sql/sql_table.cc:
Added parameter to mysql_rm_table_no_locks() to not automaticly do UNLOCK TABLES
Added better error message if trying to drop a view with DROP TABLE
Don't try to create something we select from
sql/sql_table.h:
Updated prototypes
Materialization forced in case if rand() used in view or derived table to avoud several calls of rand for gting value of a field.
Fixed set variable uncachable flag from - it shouldbe a side effect not a random value.
1. Transformation of row IN subquery made the same as single value.
2. replace_where_subcondition() made working on several layers of OR/AND because it called on expression before fix_fields().
MDEV-5034:Wrong result on LEFT JOIN with a SELECT SQ or a merge view, UNION in IN subquery
Make reset null_row same as it was set in evaluate_null_complemented_join_record().
The problem was that view firlds detect null_row by not-yet-reset table.
mysql_derived_merge_for_insert() should not be called for views or derived tables which are not put (directly or via other views) in main SELECT_LEX "join list".
