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Why does the SHAPE.len field disappear after joining a table to a SDE feature class?
The SHAPE.LEN column is stored in the F table of an SDE layer. When opening the attribute table for a SDE layer without a join, the layer's business table is joined with the F table internally and the result is displayed.
When joining a table to an SDE layer, the business table is joined to the join table internally and the result is displayed. The F table containing the length attribute is bypassed.