I have explored the SQL Server 2019, Intelligent Query Processing Feature – “Table Variable Deferred Compilation”.
The script contains some theory at the top and links to read.
After that, there are required queries to run on SQL Server 2019.
This way we can see the feature in action and look at it's strengths and caveats.
2020-08-03
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There is a table tmp_tab:
CREATE TABLE tmp_tab ( id int, val int );
INSERT INTO tmp_tab VALUES (1, 1), (2, NULL), (3, 3), (4, 4), (5, 5);You want to order the rows ids by the following expression:
ISNULL(val, id) + 1Which of the following queries produces the expected ordering and why? (Select all correct) See possible answers