private Type getOperator(
AnalysisContext context,
Expression node,
OperatorType operatorType,
Expression... arguments) {
ImmutableList.Builder<Type> argumentTypes = ImmutableList.builder();
for (Expression expression : arguments) {
argumentTypes.add(process(expression, context));
}
Signature operatorSignature;
try {
operatorSignature = functionRegistry.resolveOperator(operatorType, argumentTypes.build());
} catch (OperatorNotFoundException e) {
throw new SemanticException(TYPE_MISMATCH, node, e.getMessage());
}
for (int i = 0; i < arguments.length; i++) {
Expression expression = arguments[i];
Type type = typeManager.getType(operatorSignature.getArgumentTypes().get(i));
coerceType(
context,
expression,
type,
String.format("Operator %s argument %d", operatorSignature, i));
}
Type type = typeManager.getType(operatorSignature.getReturnType());
expressionTypes.put(node, type);
return type;
}
private ReflectionParametricScalar(
Signature signature,
String description,
boolean hidden,
Map<Signature, Implementation> exactImplementations,
List<Implementation> specializedImplementations,
List<Implementation> implementations,
boolean deterministic) {
super(
signature.getName(),
signature.getTypeParameterRequirements(),
signature.getReturnType().toString(),
signature
.getArgumentTypes()
.stream()
.map(TypeSignature::toString)
.collect(toImmutableList()));
this.description = description;
this.hidden = hidden;
this.exactImplementations =
ImmutableMap.copyOf(requireNonNull(exactImplementations, "exactImplementations is null"));
this.specializedImplementations =
ImmutableList.copyOf(
requireNonNull(specializedImplementations, "specializedImplementations is null"));
this.implementations =
ImmutableList.copyOf(requireNonNull(implementations, "implementations is null"));
this.deterministic = deterministic;
}
public MethodHandleAndConstructor specialize(
Signature boundSignature,
Map<String, Type> boundTypeParameters,
TypeManager typeManager,
FunctionRegistry functionRegistry) {
for (Map.Entry<String, Class<?>> entry : specializedTypeParameters.entrySet()) {
if (!entry
.getValue()
.isAssignableFrom(boundTypeParameters.get(entry.getKey()).getJavaType())) {
return null;
}
}
Class<?> returnContainerType =
getNullAwareContainerType(
typeManager.getType(boundSignature.getReturnType()).getJavaType(), nullable);
if (!returnContainerType.equals(methodHandle.type().returnType())) {
return null;
}
for (int i = 0; i < boundSignature.getArgumentTypes().size(); i++) {
Class<?> argumentContainerType =
getNullAwareContainerType(
typeManager.getType(boundSignature.getArgumentTypes().get(i)).getJavaType(),
nullableArguments.get(i));
if (!argumentNativeContainerTypes.get(i).isAssignableFrom(argumentContainerType)) {
return null;
}
}
MethodHandle methodHandle = this.methodHandle;
for (ImplementationDependency dependency : dependencies) {
methodHandle =
methodHandle.bindTo(
dependency.resolve(boundTypeParameters, typeManager, functionRegistry));
}
MethodHandle constructor = null;
if (this.constructor.isPresent()) {
constructor = this.constructor.get();
for (ImplementationDependency dependency : constructorDependencies) {
constructor =
constructor.bindTo(
dependency.resolve(boundTypeParameters, typeManager, functionRegistry));
}
}
return new MethodHandleAndConstructor(methodHandle, Optional.ofNullable(constructor));
}
@Override
protected Type visitFunctionCall(FunctionCall node, AnalysisContext context) {
if (node.getWindow().isPresent()) {
for (Expression expression : node.getWindow().get().getPartitionBy()) {
process(expression, context);
Type type = expressionTypes.get(expression);
if (!type.isComparable()) {
throw new SemanticException(
TYPE_MISMATCH,
node,
"%s is not comparable, and therefore cannot be used in window function PARTITION BY",
type);
}
}
for (SortItem sortItem : node.getWindow().get().getOrderBy()) {
process(sortItem.getSortKey(), context);
Type type = expressionTypes.get(sortItem.getSortKey());
if (!type.isOrderable()) {
throw new SemanticException(
TYPE_MISMATCH,
node,
"%s is not orderable, and therefore cannot be used in window function ORDER BY",
type);
}
}
if (node.getWindow().get().getFrame().isPresent()) {
WindowFrame frame = node.getWindow().get().getFrame().get();
if (frame.getStart().getValue().isPresent()) {
Type type = process(frame.getStart().getValue().get(), context);
if (!type.equals(BIGINT)) {
throw new SemanticException(
TYPE_MISMATCH,
node,
"Window frame start value type must be BIGINT (actual %s)",
type);
}
}
if (frame.getEnd().isPresent() && frame.getEnd().get().getValue().isPresent()) {
Type type = process(frame.getEnd().get().getValue().get(), context);
if (!type.equals(BIGINT)) {
throw new SemanticException(
TYPE_MISMATCH,
node,
"Window frame end value type must be BIGINT (actual %s)",
type);
}
}
}
}
ImmutableList.Builder<TypeSignature> argumentTypes = ImmutableList.builder();
for (Expression expression : node.getArguments()) {
argumentTypes.add(process(expression, context).getTypeSignature());
}
Signature function =
functionRegistry.resolveFunction(
node.getName(), argumentTypes.build(), context.isApproximate());
for (int i = 0; i < node.getArguments().size(); i++) {
Expression expression = node.getArguments().get(i);
Type type = typeManager.getType(function.getArgumentTypes().get(i));
requireNonNull(type, format("Type %s not found", function.getArgumentTypes().get(i)));
if (node.isDistinct() && !type.isComparable()) {
throw new SemanticException(
TYPE_MISMATCH,
node,
"DISTINCT can only be applied to comparable types (actual: %s)",
type);
}
coerceType(
context, expression, type, String.format("Function %s argument %d", function, i));
}
resolvedFunctions.put(node, function);
Type type = typeManager.getType(function.getReturnType());
expressionTypes.put(node, type);
return type;
}