dawidwys commented on code in PR #22951:
URL: https://github.com/apache/flink/pull/22951#discussion_r1485933655
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/ArrayComparableElementArgumentTypeStrategy.java:
##########
@@ -34,40 +32,33 @@
import
org.apache.flink.table.types.logical.StructuredType.StructuredComparison;
import org.apache.flink.util.Preconditions;
-import java.util.Collections;
import java.util.List;
import java.util.Optional;
/**
- * An {@link InputTypeStrategy} that checks if the input argument is an ARRAY
type and check whether
- * its' elements are comparable.
+ * An {@link ArgumentTypeStrategy} that checks if the input argument is an
ARRAY type and check
+ * whether its' elements are comparable.
*
* <p>It requires one argument.
*
* <p>For the rules which types are comparable with which types see {@link
* #areComparable(LogicalType, LogicalType)}.
*/
@Internal
-public final class ArrayComparableElementTypeStrategy implements
InputTypeStrategy {
+public final class ArrayComparableElementArgumentTypeStrategy implements
ArgumentTypeStrategy {
+
private final StructuredComparison requiredComparison;
- private final ConstantArgumentCount argumentCount;
- public ArrayComparableElementTypeStrategy(StructuredComparison
requiredComparison) {
+ public ArrayComparableElementArgumentTypeStrategy(StructuredComparison
requiredComparison) {
Preconditions.checkArgument(requiredComparison !=
StructuredComparison.NONE);
this.requiredComparison = requiredComparison;
- this.argumentCount = ConstantArgumentCount.of(1);
- }
-
- @Override
- public ArgumentCount getArgumentCount() {
- return argumentCount;
}
@Override
- public Optional<List<DataType>> inferInputTypes(
- CallContext callContext, boolean throwOnFailure) {
+ public Optional<DataType> inferArgumentType(
+ CallContext callContext, int argumentPos, boolean throwOnFailure) {
final List<DataType> argumentDataTypes =
callContext.getArgumentDataTypes();
- final DataType argumentType = argumentDataTypes.get(0);
+ final DataType argumentType = argumentDataTypes.get(argumentPos);
if (!argumentType.getLogicalType().is(LogicalTypeRoot.ARRAY)) {
return callContext.fail(throwOnFailure, "All arguments requires to
be an ARRAY type");
Review Comment:
please update the comment
It's an argument type strategy now, so it applies to a single argument not
`ALL`
##########
flink-table/flink-table-common/src/test/java/org/apache/flink/table/types/inference/InputTypeStrategiesTest.java:
##########
@@ -640,6 +640,28 @@ ANY, explicit(DataTypes.INT())
.expectArgumentTypes(
DataTypes.ARRAY(DataTypes.INT().notNull()).notNull(),
DataTypes.INT()),
+
TestSpec.forStrategy(sequence(SpecificInputTypeStrategies.ARRAY_COMPARABLE))
+ .expectSignature("f(<ARRAY<COMPARABLE>>)")
+
.calledWithArgumentTypes(DataTypes.ARRAY(DataTypes.ROW()))
+ .expectErrorMessage(
+ "Invalid input arguments. Expected signatures
are:\n"
+ + "f(<ARRAY<COMPARABLE>>)"),
+ TestSpec.forStrategy(
+ "Strategy fails if input argument type is not
ARRAY",
+
sequence(SpecificInputTypeStrategies.ARRAY_COMPARABLE))
+ .calledWithArgumentTypes(DataTypes.INT())
+ .expectErrorMessage(
+ "Invalid input arguments. Expected signatures
are:\n"
+ + "f(<ARRAY<COMPARABLE>>)"),
+ TestSpec.forStrategy(
+ "Strategy fails if the number of input
arguments are not one",
+
sequence(SpecificInputTypeStrategies.ARRAY_COMPARABLE))
+ .calledWithArgumentTypes(
+ DataTypes.ARRAY(DataTypes.INT()),
+ DataTypes.ARRAY(DataTypes.STRING()))
+ .expectErrorMessage(
+ "Invalid input arguments. Expected signatures
are:\n"
+ + "f(<ARRAY<COMPARABLE>>)"),
Review Comment:
You test the `sequence` strategy here. We have tests for that already.
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java:
##########
@@ -231,6 +231,22 @@ ANY, and(logical(LogicalTypeRoot.BOOLEAN), LITERAL)
"org.apache.flink.table.runtime.functions.scalar.ArrayContainsFunction")
.build();
+ public static final BuiltInFunctionDefinition ARRAY_SORT =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("ARRAY_SORT")
+ .kind(SCALAR)
+ .inputTypeStrategy(
+ or(
+ sequence(ARRAY_COMPARABLE),
+ sequence(
+ ARRAY_COMPARABLE,
+ InputTypeStrategies.explicit(
Review Comment:
```suggestion
explicit(
```
##########
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/functions/scalar/ArraySortFunction.java:
##########
@@ -0,0 +1,124 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.flink.table.runtime.functions.scalar;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.api.DataTypes;
+import org.apache.flink.table.data.ArrayData;
+import org.apache.flink.table.data.GenericArrayData;
+import org.apache.flink.table.functions.BuiltInFunctionDefinitions;
+import org.apache.flink.table.functions.FunctionContext;
+import org.apache.flink.table.functions.SpecializedFunction;
+import org.apache.flink.table.types.CollectionDataType;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.util.FlinkRuntimeException;
+
+import javax.annotation.Nullable;
+
+import java.lang.invoke.MethodHandle;
+import java.util.Arrays;
+import java.util.Comparator;
+
+import static org.apache.flink.table.api.Expressions.$;
+
+/** Implementation of ARRAY_SORT function. */
+@Internal
+public class ArraySortFunction extends BuiltInScalarFunction {
+
+ private final ArrayData.ElementGetter elementGetter;
+ private final SpecializedFunction.ExpressionEvaluator greaterEvaluator;
+
+ private transient MethodHandle greaterHandle;
+
+ public ArraySortFunction(SpecializedFunction.SpecializedContext context) {
+ super(BuiltInFunctionDefinitions.ARRAY_SORT, context);
+ final DataType elementDataType =
+ ((CollectionDataType)
context.getCallContext().getArgumentDataTypes().get(0))
+ .getElementDataType()
+ .toInternal();
+ elementGetter =
+
ArrayData.createElementGetter(elementDataType.toInternal().getLogicalType());
+ greaterEvaluator =
+ context.createEvaluator(
+ $("element1").isGreater($("element2")),
+ DataTypes.BOOLEAN(),
+ DataTypes.FIELD("element1",
elementDataType.notNull().toInternal()),
+ DataTypes.FIELD("element2",
elementDataType.notNull().toInternal()));
+ }
+
+ @Override
+ public void open(FunctionContext context) throws Exception {
+ greaterHandle = greaterEvaluator.open(context);
+ }
+
+ public @Nullable ArrayData eval(ArrayData array, Boolean...
ascendingOrder) {
+ try {
+ if (array == null) {
+ return null;
+ }
+ if (array.size() == 0) {
+ return array;
+ }
+ boolean isAscending = ascendingOrder.length > 0 ?
ascendingOrder[0] : true;
+ Object[] elements = new Object[array.size()];
+ for (int i = 0; i < array.size(); i++) {
+ elements[i] = elementGetter.getElementOrNull(array, i);
+ }
+ Comparator<Object> ascendingComparator = new
ArraySortComparator(isAscending);
+ Arrays.sort(elements, ascendingComparator);
+ return new GenericArrayData(elements);
+ } catch (Throwable t) {
+ throw new FlinkRuntimeException(t);
+ }
+ }
+
+ private class ArraySortComparator implements Comparator<Object> {
+ private final boolean isAscending;
+
+ public ArraySortComparator(boolean isAscending) {
+ this.isAscending = isAscending;
+ }
+
+ @Override
+ public int compare(Object o1, Object o2) {
+ Comparator<Object> baseComparator =
+ (a, b) -> {
+ try {
+ if (a == null || b == null) {
+ return 0;
+ }
+ boolean isGreater = (boolean)
greaterHandle.invoke(a, b);
+ return isGreater ? 1 : -1;
+ } catch (Throwable e) {
+ throw new RuntimeException(e);
+ }
+ };
+ Comparator<Object> comparator =
+ isAscending
+ ? Comparator.nullsFirst(baseComparator)
+ : Comparator.nullsLast(baseComparator.reversed());
Review Comment:
Good that you used the `Comparator.nullsFirst`, but could you please move it
outside the `ArraySortComparator` It does not make sense to create a new
comparator for every single record in the array.
e.g.
```
Comparator<Object> ascendingComparator = new
ArraySortComparator(isAscending);
Arrays.sort(elements, isAscending
? Comparator.nullsFirst(ascendingComparator)
: Comparator.nullsLast(ascendingComparator));
```
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/SpecificInputTypeStrategies.java:
##########
@@ -89,6 +90,10 @@ public static InputTypeStrategy windowTimeIndicator() {
public static final ArgumentTypeStrategy ARRAY_ELEMENT_ARG =
new ArrayElementArgumentTypeStrategy();
+ /** Argument type representing the array is comparable. */
+ public static final ArgumentTypeStrategy ARRAY_COMPARABLE =
Review Comment:
```suggestion
public static final ArgumentTypeStrategy ARRAY_FULLY_COMPARABLE =
```
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