When I run the Tcl script below with SQLite 3.6.16, I get this error
message:
malformed database schema (T1_idx) - no such table: main.T1
Here is the script:
file delete "DB1.dat"
sqlite3 DB1 "DB1.dat"
DB1 eval {CREATE TABLE T1 (name text NOT NULL);CREATE INDEX
T1_idx ON T1(name);}
DB1 close
sqlite3 DB1 "DB1.dat"
DB1 eval {PRAGMA reverse_unordered_selects=1}
DB1 eval {SELECT * FROM T1}
The error occurs on the last line of the script. Commenting out the
line "DB1 eval {PRAGMA reverse_unordered_selects=1}" makes the problem
go away. Executing the pragma so it's done after the SELECT makes the
problem go away. Not closing and re-opening the database makes the
problem go away. Executing a different pragma, instead of
reverse_unordered_selects, makes the problem go away.
I have been using PRAGMA reverse_unordered_selects for a few months, and
it has revealed a couple of unintentional dependencies on order --
thanks! I just recently realized that the PRAGMAS need to be executed
once for each database connection, rather than once per process...when I
made that change, this problem started showing up. It seems to depend
on the particulars of the schema of the first table on which a SELECT is
done after opening the database.
I have reproduced this on a Linux machine, as well as machines running
Sun Solaris and IBM AIX. I am attempting to try this with a more recent
version of SQLite, but that is unfortunately not trivial in my
environment.
Thanks,
Robin Albrecht
Staff Engineer
Mentor Graphics Corp.
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