Karthik Kamath 90b9c957ba BUG#21142859: FUNCTION UPDATING A VIEW FAILS TO FIND TABLE ...

THAT ACTUALLY EXISTS

ANALYSIS:
=========
Stored functions updating a view where the view table has a
trigger defined that updates another table, fails reporting
an error that the table doesn't exist.

If there is a trigger defined on a table, a variable
'trg_event_map' will be set to a non-zero value after the
parsed tree creation. This indicates what triggers we need to
pre-load for the TABLE_LIST when opening an associated table.

During the prelocking phase, the variable 'trg_event_map'
will not be set for the view table. This value will be set
after the processing of triggers defined on the table. During
the processing of sub-statements, 'locked_tables_mode' will be
set to 'LTM_PRELOCKED' which denotes that further locking
of tables/functions cannot be done. This results in the other
table not being locked and thus further processing results in
an error getting reported.

FIX:
====
During the prelocking of view, the value of 'trg_event_map'
of the view is copied to 'trg_event_map' of the next table
in the TABLE_LIST. This results in the locking of tables
associated with the trigger as well.

2016-05-18 11:07:29 +05:30

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