Hi all,
I'm thinking that temporary views should be pretty trivial to
implement.
* Allow temporary views
This should be as simple as modifying gram.y (to set
ViewStmt->view->istemp) and some logic in RemoveTempRelations() to remove
the view's rule
* Require view using temporary tables to be temporary views
This is the non-trivial part. If you are creating a view on just a
temporary table there's no problem. But what happens when do the
following?
CREATE VIEW abc AS select * from tab1,tab2,temp_tab3 ...
SQL99 avoids this with syntax rule 6 of 11.21 <view definition>
No <table reference> generally contained in the <query expression> shall
identify any declared local temporary table.
There are a few ways it could be implemented:
1) SQL99
2) Views whose <query epression> contains one or more <table references>
to temporary tables are created as temporary views
3) Views whose <query epression> contains one or more <table references>
to temporary tables must be explicitly include the TEMP[ORARY] syntax.
Thoughts?
Gavin
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