public RelOptTable getTableForMember(List<String> names) {
final SqlValidatorTable table = catalogReader.getTable(names);
final RelDataType rowType = table.getRowType();
final List<RelCollation> collationList = deduceMonotonicity(table);
if (names.size() < 3) {
String[] newNames2 = {"CATALOG", "SALES", ""};
List<String> newNames = new ArrayList<String>();
int i = 0;
while (newNames.size() < newNames2.length) {
newNames.add(i, newNames2[i]);
++i;
}
names = newNames;
}
return createColumnSet(table, names, rowType, collationList);
}
private List<RelCollation> deduceMonotonicity(SqlValidatorTable table) {
final RelDataType rowType = table.getRowType();
final List<RelCollation> collationList = new ArrayList<RelCollation>();
// Deduce which fields the table is sorted on.
int i = -1;
for (RelDataTypeField field : rowType.getFieldList()) {
++i;
final SqlMonotonicity monotonicity = table.getMonotonicity(field.getName());
if (monotonicity != SqlMonotonicity.NOT_MONOTONIC) {
final RelFieldCollation.Direction direction =
monotonicity.isDecreasing()
? RelFieldCollation.Direction.DESCENDING
: RelFieldCollation.Direction.ASCENDING;
collationList.add(
RelCollationImpl.of(
new RelFieldCollation(
i, direction, RelFieldCollation.NullDirection.UNSPECIFIED)));
}
}
return collationList;
}