/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.operator.scalar;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.function.Description;
import com.facebook.presto.spi.function.OperatorDependency;
import com.facebook.presto.spi.function.ScalarFunction;
import com.facebook.presto.spi.function.SqlNullable;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.function.TypeParameter;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.spi.type.Type;
import io.airlift.slice.Slice;
import java.lang.invoke.MethodHandle;
import static com.facebook.presto.operator.scalar.ArrayMinMaxUtils.booleanArrayMinMax;
import static com.facebook.presto.operator.scalar.ArrayMinMaxUtils.doubleArrayMinMax;
import static com.facebook.presto.operator.scalar.ArrayMinMaxUtils.longArrayMinMax;
import static com.facebook.presto.operator.scalar.ArrayMinMaxUtils.sliceArrayMinMax;
import static com.facebook.presto.spi.StandardErrorCode.GENERIC_INTERNAL_ERROR;
import static com.facebook.presto.spi.function.OperatorType.LESS_THAN;
import static com.google.common.base.Throwables.propagateIfInstanceOf;
@ScalarFunction("array_min")
@Description("Get minimum value of array")
public final class ArrayMinFunction
{
private ArrayMinFunction() {}
@TypeParameter("T")
@SqlType("T")
@SqlNullable
public static Void arrayWithUnknownType(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"T", "T"}) MethodHandle compareMethodHandle,
@SqlType("array(T)") Block block)
{
return null;
}
@TypeParameter("T")
@SqlType("T")
@SqlNullable
public static Long longArrayMin(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"T", "T"}) MethodHandle compareMethodHandle,
@TypeParameter("T") Type elementType,
@SqlType("array(T)") Block block)
{
return longArrayMinMax(compareMethodHandle, elementType, block);
}
@TypeParameter("T")
@SqlType("T")
@SqlNullable
public static Boolean booleanArrayMin(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"T", "T"}) MethodHandle compareMethodHandle,
@TypeParameter("T") Type elementType,
@SqlType("array(T)") Block block)
{
return booleanArrayMinMax(compareMethodHandle, elementType, block);
}
@TypeParameter("T")
@SqlType("T")
@SqlNullable
public static Double doubleArrayMin(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"T", "T"}) MethodHandle compareMethodHandle,
@TypeParameter("T") Type elementType,
@SqlType("array(T)") Block block)
{
return doubleArrayMinMax(compareMethodHandle, elementType, block);
}
@TypeParameter("T")
@SqlType("T")
@SqlNullable
public static Slice sliceArrayMin(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"T", "T"}) MethodHandle compareMethodHandle,
@TypeParameter("T") Type elementType,
@SqlType("array(T)") Block block)
{
return sliceArrayMinMax(compareMethodHandle, elementType, block);
}
@TypeParameter("T")
@SqlType("T")
@SqlNullable
public static Block blockArrayMin(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"T", "T"}) MethodHandle compareMethodHandle,
@TypeParameter("T") Type elementType,
@SqlType("array(T)") Block block)
{
try {
if (block.getPositionCount() == 0) {
return null;
}
Block selectedValue = (Block) elementType.getObject(block, 0);
for (int i = 0; i < block.getPositionCount(); i++) {
if (block.isNull(i)) {
return null;
}
Block value = (Block) elementType.getObject(block, i);
if ((boolean) compareMethodHandle.invokeExact(value, selectedValue)) {
selectedValue = value;
}
}
return selectedValue;
}
catch (Throwable t) {
propagateIfInstanceOf(t, Error.class);
propagateIfInstanceOf(t, PrestoException.class);
throw new PrestoException(GENERIC_INTERNAL_ERROR, t);
}
}
}