Igorkim78 added a comment.
Looking at query exetution plans, ProjectionOp for the query with lang() for coDescription got arranged prior to materialization of coDescription, so it (along with its lang) has not got the way to the projection. The reason for such behavior needs some more research. Will update on that. TASK DETAIL https://phabricator.wikimedia.org/T229655 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Igorkim78 Cc: Smalyshev, Igorkim78, Aklapper, VladimirAlexiev, darthmon_wmde, DannyS712, Nandana, Lahi, Gq86, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, _jensen, rosalieper, Jonas, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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