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OR-Expansion by-passed: top query block of a DML | Mohamed Houri’s Oracle Notes
https://hourim.wordpress.com/2020/11/29/or-expansion-by-passed-top-query-block-of-a-dml/
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Here’s an interesting OR-Expansion limit which reared its head a little bit after a 12cR1-to-19c Oracle upgrade. It happens during a Create Table As Select (CTAS) which was using a CONCATENATION op…
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