public List<SqlMoniker> getAllSchemaObjectNames(List<String> names) {
List<SqlMoniker> result;
switch (names.size()) {
case 0:
// looking for schema names
result = new ArrayList<SqlMoniker>();
for (MockSchema schema : schemas.values()) {
result.add(new SqlMonikerImpl(schema.name, SqlMonikerType.Schema));
}
return result;
case 1:
// looking for table names in the given schema
MockSchema schema = schemas.get(names.get(0));
if (schema == null) {
return Collections.emptyList();
}
result = new ArrayList<SqlMoniker>();
for (String tableName : schema.tableNames) {
result.add(new SqlMonikerImpl(tableName, SqlMonikerType.Table));
}
return result;
default:
return Collections.emptyList();
}
}
protected RexNode register(RexNode expr) {
final String key = expr.toString();
final RexNode previous = mapDigestToExpr.put(key, expr);
if (!allowDups && (previous != null)) {
throw new SubExprExistsException(expr);
}
return expr;
}
/**
* Adds on to the existing join condition reference counts the references from the new join
* condition.
*
* @param multiJoinInputs inputs into the new MultiJoinRel
* @param nTotalFields total number of fields in the MultiJoinRel
* @param joinCondition the new join condition
* @param origJoinFieldRefCounts existing join condition reference counts
* @param newJoinFieldRefCountsMap map containing the new join condition reference counts, indexed
* by input #
*/
private void addOnJoinFieldRefCounts(
RelNode[] multiJoinInputs,
int nTotalFields,
RexNode joinCondition,
List<int[]> origJoinFieldRefCounts,
Map<Integer, int[]> newJoinFieldRefCountsMap) {
// count the input references in the join condition
int[] joinCondRefCounts = new int[nTotalFields];
joinCondition.accept(new InputReferenceCounter(joinCondRefCounts));
// first, make a copy of the ref counters
int nInputs = multiJoinInputs.length;
int currInput = 0;
for (int[] origRefCounts : origJoinFieldRefCounts) {
newJoinFieldRefCountsMap.put(currInput, (int[]) origRefCounts.clone());
currInput++;
}
// add on to the counts for each input into the MultiJoinRel the
// reference counts computed for the current join condition
currInput = -1;
int startField = 0;
int nFields = 0;
for (int i = 0; i < nTotalFields; i++) {
if (joinCondRefCounts[i] == 0) {
continue;
}
while (i >= (startField + nFields)) {
startField += nFields;
currInput++;
assert (currInput < nInputs);
nFields = multiJoinInputs[currInput].getRowType().getFieldCount();
}
int[] refCounts = newJoinFieldRefCountsMap.get(currInput);
refCounts[i - startField] += joinCondRefCounts[i];
}
}
private List<AggregateCall> transformAggCalls(
RelDataTypeFactory typeFactory, int nGroupCols, List<AggregateCall> origCalls) {
List<AggregateCall> newCalls = new ArrayList<AggregateCall>();
int iInput = nGroupCols;
for (AggregateCall origCall : origCalls) {
if (origCall.isDistinct()
|| !SUPPORTED_AGGREGATES.containsKey(origCall.getAggregation().getClass())) {
return null;
}
Aggregation aggFun;
RelDataType aggType;
if (origCall.getAggregation().getName().equals("COUNT")) {
aggFun = new SqlSumEmptyIsZeroAggFunction(origCall.getType());
SqlAggFunction af = (SqlAggFunction) aggFun;
final AggregateRelBase.AggCallBinding binding =
new AggregateRelBase.AggCallBinding(
typeFactory, af, Collections.singletonList(origCall.getType()), nGroupCols);
// count(any) is always not null, however nullability of sum might
// depend on the number of columns in GROUP BY.
// Here we use SUM0 since we are sure we will not face nullable
// inputs nor we'll face empty set.
aggType = af.inferReturnType(binding);
} else {
aggFun = origCall.getAggregation();
aggType = origCall.getType();
}
AggregateCall newCall =
new AggregateCall(
aggFun,
origCall.isDistinct(),
Collections.singletonList(iInput),
aggType,
origCall.getName());
newCalls.add(newCall);
++iInput;
}
return newCalls;
}
static {
SUPPORTED_AGGREGATES.put(SqlMinMaxAggFunction.class, true);
SUPPORTED_AGGREGATES.put(SqlCountAggFunction.class, true);
SUPPORTED_AGGREGATES.put(SqlSumAggFunction.class, true);
SUPPORTED_AGGREGATES.put(SqlSumEmptyIsZeroAggFunction.class, true);
}
protected RexNode lookup(RexNode expr) {
return mapDigestToExpr.get(expr.toString());
}
protected void registerSchema(MockSchema schema) {
schemas.put(schema.name, schema);
}