public List<Double> averageColumnSizes(TableScan rel, RelMetadataQuery mq) {
final List<RelDataTypeField> fields = rel.getRowType().getFieldList();
final ImmutableList.Builder<Double> list = ImmutableList.builder();
for (RelDataTypeField field : fields) {
list.add(averageTypeValueSize(field.getType()));
}
return list.build();
}
@Override
public RelNode visit(TableScan scan) {
scan.getCluster().setMetadataProvider(metadataProvider);
return super.visit(scan);
}