Created attachment 119097 [details] table format dialog If you open the table format dialog, its background tab has a 'For' drop down menu which lists cell, row, and table, but not column. A user would have to select the column before opening the dialog if he wanted to set the background for the column.
Yep, confirm this. Thanks, Cor
A background does not belong to attributes available in <style:table-columns-properties> element. https://docs.oasis-open.org/office/OpenDocument/v1.3/os/part3-schema/OpenDocument-v1.3-os-part3-schema.html#__RefHeading__1416514_253892949