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This expression worked for me, thanks for help:
if("diameter_valve" is nullNULL, overlay_nearest('waterpipe', diameter_pipe, max_distance:=0.01)[0], "diameter_valve" )
This expression worked for me, thanks for help
if("diameter_valve" is null, overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")
This expression worked for me:
if("diameter_valve" is NULL, overlay_nearest('waterpipe', diameter_pipe, max_distance:=0.01)[0], "diameter_valve" )