On 05/01/2017 04:17 PM, David Fetter wrote:
Maybe we could allow a "decorator" that would tell the planner the CTE
could be inlined?
WITH INLINE mycte AS ( ...)
+1 for a decorator, -1 for this one.
I am not sure I like decorators since this means adding an ad hoc query
hint directly into the SQL syntax which is something which I requires
serious consideration.
We already have an explicit optimization fence with OFFSET 0, and I
think making optimization fences explicit is how we should continue.
I'd be more in favor of something along the lines of
WITH FENCED /* Somewhat fuzzy. What fence? */
or
WITH AT_MOST_ONCE /* Clearer, but not super precise */
or
WITH UNIQUE_ATOMIC /* More descriptive, but not super clear without the
docs in hand */
or something along that line.
What about WITH MATERIALIZED, borrowing from the MySQL terminology
"materialized subquery"?
Andreas
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