for (String dimension : index.getAvailableDimensions()) {
ColumnBuilder builder = new ColumnBuilder()
.setType(ValueType.STRING)
.setHasMultipleValues(true)
.setDictionaryEncodedColumn(
new DictionaryEncodedColumnSupplier(
index.getDimValueLookup(dimension),
null,
index.getDimColumn(dimension),
columnConfig.columnCacheSizeBytes()
)