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Doc: mention limitation of the number of resultset columns
The PostgreSQL limitations section of the documents mentioned the limiton the number of columns that can exist in a table. Users might besurprised to find that there's also a limit on the number of columns thatcan exist in a targetlist. Users may experience restrictions whichsurprise them if they happened to select a large number of columns fromseveral tables with many columns. Here we document that there is alimitation on this and mention what that limit actually is.Wording proposal by Alvaro HerreraReported-by: Vladimir SitnikovAuthor: Dave CrammerReviewed-by: Tom LaneDiscussion:https://postgr.es/m/CAB=Je-E18aTYpNqje4mT0iEADpeGLSzwUvo3H9kRRuDdsNo4aQ@mail.gmail.comBackpatch-through: 12, where the limitations section was added1 parentc73748b commite6bd7aa
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