Hi team, is there a way to merge values of a dimension to form a string array during ingestion as part of rollup? ex: for below input col1 | col2 | col3 ------------------- A | B1 | C1 A | B2 | C2 we want the rolled up output to look like col1| col2| col3 -------------------- A | B1,B2 | C1,C2