Right now I have about 90K items in my database, but only 1965 items have anything in the document pane.  Even so, if I double-click the ItemHasHTML field to load the items with document content in the scratch grid, IQ says "using the current settings, the grid would contain at least 90613 items".  Usually for a Y/N field IQ would load only the items that are checked - but maybe it's different for ItemHasHTML, because of its special function relating to the document pane?