From10Gr2, HASH UNIQUE Operation Returns Results in UNSORTED ORDER by Default
(Doc ID 341838.1)
Last updated on FEBRUARY 03, 2019
Applies to:Oracle Server - Enterprise Edition - Version: 10.2.0.1 to 220.127.116.11
This problem can occur on any platform.
Setting optimizer_features_enable="9.2.0" reverts to the previous behavior:
SQL> alter session set optimizer_features_enable="9.2.0";
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