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presto-main/src/main/java/com/facebook/presto/operator/scalar/ArrayJoin.java
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| /* | ||
| * 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:https://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.metadata.FunctionInfo; | ||
| import com.facebook.presto.metadata.FunctionRegistry; | ||
| import com.facebook.presto.metadata.ParametricScalar; | ||
| import com.facebook.presto.metadata.Signature; | ||
| import com.facebook.presto.spi.ConnectorSession; | ||
| import com.facebook.presto.spi.PrestoException; | ||
| import com.facebook.presto.spi.block.Block; | ||
| import com.facebook.presto.spi.type.StandardTypes; | ||
| import com.facebook.presto.spi.type.Type; | ||
| import com.facebook.presto.spi.type.TypeManager; | ||
| import com.facebook.presto.spi.type.TypeSignature; | ||
| import com.facebook.presto.type.UnknownType; | ||
| import com.google.common.collect.ImmutableList; | ||
| import io.airlift.slice.DynamicSliceOutput; | ||
| import io.airlift.slice.Slice; | ||
|
|
||
| import java.lang.invoke.MethodHandle; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| import static com.facebook.presto.metadata.OperatorType.CAST; | ||
| import static com.facebook.presto.metadata.Signature.internalOperator; | ||
| import static com.facebook.presto.metadata.Signature.typeParameter; | ||
| import static com.facebook.presto.spi.StandardErrorCode.INTERNAL_ERROR; | ||
| import static com.facebook.presto.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT; | ||
| import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature; | ||
| import static com.facebook.presto.type.TypeUtils.parameterizedTypeName; | ||
| import static com.facebook.presto.type.TypeUtils.readStructuralBlock; | ||
| import static com.facebook.presto.util.Failures.checkCondition; | ||
| import static com.facebook.presto.util.Reflection.methodHandle; | ||
| import static java.lang.String.format; | ||
|
|
||
| public final class ArrayJoin | ||
| extends ParametricScalar | ||
| { | ||
| public static final ArrayJoin ARRAY_JOIN = new ArrayJoin(); | ||
| public static final ArrayJoinWithNullReplacement ARRAY_JOIN_WITH_NULL_REPLACEMENT = new ArrayJoinWithNullReplacement(); | ||
|
|
||
| private static final TypeSignature VARCHAR_TYPE_SIGNATURE = parseTypeSignature(StandardTypes.VARCHAR); | ||
| private static final String FUNCTION_NAME = "array_join"; | ||
| private static final String DESCRIPTION = "Concatenates the elements of the given array using a delimiter and an optional string to replace nulls"; | ||
| private static final Signature SIGNATURE = new Signature(FUNCTION_NAME, ImmutableList.of(typeParameter("T")), StandardTypes.VARCHAR, ImmutableList.of("array<T>", StandardTypes.VARCHAR), false, false); | ||
|
|
||
| public static class ArrayJoinWithNullReplacement | ||
| extends ParametricScalar | ||
| { | ||
| private final Signature signature = new Signature(FUNCTION_NAME, ImmutableList.of(typeParameter("T")), StandardTypes.VARCHAR, ImmutableList.of("array<T>", StandardTypes.VARCHAR, StandardTypes.VARCHAR), false, false); | ||
|
|
||
| @Override | ||
| public Signature getSignature() | ||
| { | ||
| return signature; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isHidden() | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isDeterministic() | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| @Override | ||
| public String getDescription() | ||
| { | ||
| return DESCRIPTION; | ||
| } | ||
|
|
||
| @Override | ||
| public FunctionInfo specialize(Map<String, Type> types, int arity, TypeManager typeManager, FunctionRegistry functionRegistry) | ||
| { | ||
| Type type = types.get("T"); | ||
| TypeSignature arrayType = parameterizedTypeName(StandardTypes.ARRAY, type.getTypeSignature()); | ||
| Signature signature = new Signature(FUNCTION_NAME, VARCHAR_TYPE_SIGNATURE, arrayType, VARCHAR_TYPE_SIGNATURE, VARCHAR_TYPE_SIGNATURE); | ||
| MethodHandle methodHandle = methodHandle(ArrayJoin.class, "arrayJoin", FunctionInfo.class, Type.class, ConnectorSession.class, Slice.class, Slice.class, Slice.class); | ||
| return specializeArrayJoin(types, functionRegistry, ImmutableList.of(false, false, false), signature, methodHandle); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public Signature getSignature() | ||
| { | ||
| return SIGNATURE; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isHidden() | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isDeterministic() | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| @Override | ||
| public String getDescription() | ||
| { | ||
| return DESCRIPTION; | ||
| } | ||
|
|
||
| @Override | ||
| public FunctionInfo specialize(Map<String, Type> types, int arity, TypeManager typeManager, FunctionRegistry functionRegistry) | ||
| { | ||
| Type type = types.get("T"); | ||
| TypeSignature arrayType = parameterizedTypeName(StandardTypes.ARRAY, type.getTypeSignature()); | ||
| Signature signature = new Signature(FUNCTION_NAME, VARCHAR_TYPE_SIGNATURE, arrayType, VARCHAR_TYPE_SIGNATURE); | ||
| MethodHandle methodHandle = methodHandle(ArrayJoin.class, "arrayJoin", FunctionInfo.class, Type.class, ConnectorSession.class, Slice.class, Slice.class); | ||
| return specializeArrayJoin(types, functionRegistry, ImmutableList.of(false, false), signature, methodHandle); | ||
| } | ||
|
|
||
| private static FunctionInfo specializeArrayJoin(Map<String, Type> types, FunctionRegistry functionRegistry, List<Boolean> nullableArguments, Signature signature, MethodHandle methodHandle) | ||
| { | ||
| Type type = types.get("T"); | ||
| FunctionInfo castFunction = functionRegistry.getExactFunction(internalOperator(CAST.name(), VARCHAR_TYPE_SIGNATURE, ImmutableList.of(type.getTypeSignature()))); | ||
|
|
||
| if (!(type instanceof UnknownType)) { | ||
| checkCondition(castFunction != null, INVALID_FUNCTION_ARGUMENT, "Input type %s not supported", type); | ||
| } | ||
|
|
||
| return new FunctionInfo(signature, DESCRIPTION, false, methodHandle.bindTo(castFunction).bindTo(type), true, false, nullableArguments); | ||
| } | ||
|
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||
| public static Slice arrayJoin(FunctionInfo castFunction, Type elementType, ConnectorSession session, Slice array, Slice delimiter) | ||
| { | ||
| return arrayJoin(castFunction, elementType, session, array, delimiter, null); | ||
| } | ||
|
|
||
| public static Slice arrayJoin(FunctionInfo castFunction, Type elementType, ConnectorSession session, Slice array, Slice delimiter, Slice nullReplacement) | ||
| { | ||
| Block arrayBlock = readStructuralBlock(array); | ||
| int numElements = arrayBlock.getPositionCount(); | ||
| DynamicSliceOutput sliceOutput = new DynamicSliceOutput(array.length()); | ||
| Class<?> javaType = elementType.getJavaType(); | ||
|
|
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| Class<?>[] parameters = null; | ||
| MethodHandle castFunctionHandle = null; | ||
| // can be null for the unknown type | ||
| if (castFunction != null) { | ||
| parameters = castFunction.getMethodHandle().type().parameterArray(); | ||
| castFunctionHandle = castFunction.getMethodHandle(); | ||
| } | ||
|
|
||
| for (int i = 0; i < numElements; i++) { | ||
| if (arrayBlock.isNull(i)) { | ||
| if (nullReplacement != null) { | ||
| sliceOutput.appendBytes(nullReplacement); | ||
| } | ||
| else { | ||
| continue; | ||
| } | ||
| } | ||
| else { | ||
| if (javaType == boolean.class) { | ||
| sliceOutput.appendBytes(invokeCast(parameters, castFunctionHandle, session, elementType.getBoolean(arrayBlock, i))); | ||
| } | ||
| else if (javaType == double.class) { | ||
| sliceOutput.appendBytes(invokeCast(parameters, castFunctionHandle, session, elementType.getDouble(arrayBlock, i))); | ||
| } | ||
| else if (javaType == long.class) { | ||
| sliceOutput.appendBytes(invokeCast(parameters, castFunctionHandle, session, elementType.getLong(arrayBlock, i))); | ||
| } | ||
| else if (javaType == Slice.class) { | ||
| sliceOutput.appendBytes(invokeCast(parameters, castFunctionHandle, session, elementType.getSlice(arrayBlock, i))); | ||
| } | ||
| else { | ||
| throw new PrestoException(INVALID_FUNCTION_ARGUMENT, format("Unexpected type %s", javaType.getName())); | ||
| } | ||
| } | ||
|
|
||
| if (i != numElements - 1) { | ||
| sliceOutput.appendBytes(delimiter); | ||
| } | ||
| } | ||
|
|
||
| return sliceOutput.slice(); | ||
| } | ||
|
|
||
| private static Slice invokeCast(Class<?>[] castFunctionParameters, MethodHandle castFunctionHandle, ConnectorSession session, Object arg) | ||
| { | ||
| Slice slice; | ||
| try { | ||
| if (castFunctionParameters[0] == ConnectorSession.class) { | ||
| slice = (Slice) castFunctionHandle.invokeWithArguments(session, arg); | ||
| } | ||
| else { | ||
| slice = (Slice) castFunctionHandle.invokeWithArguments(arg); | ||
| } | ||
| } | ||
| catch (Throwable throwable) { | ||
| throw new PrestoException(INTERNAL_ERROR, format("Error casting array element %s to VARCHAR", arg)); | ||
| } | ||
| return slice; | ||
| } | ||
| } |
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