private static boolean matches(
RelDataTypeFactory typeFactory, TableFunction member, List<RelDataType> argumentTypes) {
List<Parameter> parameters = member.getParameters();
if (parameters.size() != argumentTypes.size()) {
return false;
}
for (int i = 0; i < argumentTypes.size(); i++) {
RelDataType argumentType = argumentTypes.get(i);
Parameter parameter = parameters.get(i);
if (!canConvert(argumentType, parameter.getType(typeFactory))) {
return false;
}
}
return true;
}
public static OptiqSchema.TableFunctionEntry resolve(
RelDataTypeFactory typeFactory,
String name,
Collection<OptiqSchema.TableFunctionEntry> tableFunctions,
List<RelDataType> argumentTypes) {
final List<OptiqSchema.TableFunctionEntry> matches =
new ArrayList<OptiqSchema.TableFunctionEntry>();
for (OptiqSchema.TableFunctionEntry member : tableFunctions) {
if (matches(typeFactory, member.getTableFunction(), argumentTypes)) {
matches.add(member);
}
}
switch (matches.size()) {
case 0:
return null;
case 1:
return matches.get(0);
default:
throw new RuntimeException(
"More than one match for " + name + " with arguments " + argumentTypes);
}
}