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On 8/28/2018 7:03 PM, Charles Wilt wrote:
If you're using Run SQL Scripts you can change to *ALLIO in the JDBC
connection config.
I can confirm that in fact, *ALLIO as an optimisation goal causes the
non-CTE to run as slowly as the CTE does. Good diagnostic, thanks.
The view (my ultimate goal) is used in stored procedures that are called
by various ODBC-centric applications as well as Good Old Fashioned
SQLRPGLE. So changing the JDBC configuration won't help out there.
I tried OPTIMIZE FOR 1 ROWS but the 7.3 TR4 optimizer doesn't use that
hint to optimise the CTE-based UNIONs. What ultimately worked for the
issue was to extract the CTE out into its own VIEW, and SELECT ... FROM
the view.
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