You first mention colouring the column, then the row - if you want to colour the column then you can do it if your importer is a single value field - from your search you are doing stats values().. as importer, but the principle of colouring a column (not row) based on its relation to another field is to make the column you want to colour a multivalue field by appending the indicator, e.g.
| eval importer=mvappend(importer, importer_in_csv)
and to then limit the number of values shown for that field to 1 with some CSS, e.g.
<html depends="$hidden$">
<style>
#coloured_cell table tbody td div.multivalue-subcell[data-mv-index="1"]{
display: none;
}
</style>
</html>
and then to use a format statement in the table definition
<format type="color" field="importer">
<colorPalette type="expression">case(mvindex(value, 1) == "0", "#FF0000", mvindex(value, 1) == "1", "#00FF00")</colorPalette>
</format>
However, it's not clear from your search what your data actually looks like as the join subsearch is not terminated, so it's not clear where it ends and you don't appear to have any common fields to join with.
