explain_table output down to major codesif a major code appears in the code column, and any children of that major code, the children are aggregated to a list and added to the major code row. This does currently not 'condense' e.g. middle-order codes
condense_explain_table(x)Unlike explain_table, preserving order doesn't make sense, since
rows anywhere in the list can be aggregated, thus altering order compared to
the input. Size of the output will also be different if any condensing was
done.