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feat: add ARRAY_CONCAT UDF
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Patrick Stuedi committed Jul 9, 2021
1 parent 103ac01 commit 6151326
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18 changes: 18 additions & 0 deletions docs/developer-guide/ksqldb-reference/scalar-functions.md
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Expand Up @@ -426,6 +426,24 @@ ARRAY_UNION(ARRAY[1, 2, 3, 1, 2], [4, 1]) => [1, 2, 3, 4]
ARRAY_UNION(ARRAY['apple', 'apple', NULL, 'cherry'], ARRAY['cherry']) => ['apple', NULL, 'cherry']
```

### `ARRAY_CONCAT`

Since: 0.20.0

```sql
ARRAY_CONCAT(array1, array2)
```

Returns an array representing the concatenation of both input arrays.

Returns NULL if both input arrays are NULL. If only one argument is NULL, the result is the other argument.

Examples:
```sql
ARRAY_CONCAT(ARRAY[1, 2, 3, 1, 2], [4, 1]) => [1, 2, 3, 1, 2, 4, 1]
ARRAY_CONCAT(ARRAY['apple', 'apple', NULL, 'cherry'], ARRAY['cherry']) => ['apple', 'apple', NULL, 'cherry', 'cherry']
```

### `AS_MAP`

Since: 0.6.0
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52 changes: 52 additions & 0 deletions ksqldb-engine/src/main/java/io/confluent/ksql/function/udf/array/ArrayConcat.java
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/*
* Copyright 2020 Confluent Inc.
*
* Licensed under the Confluent Community License; you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.confluent.io/confluent-community-license
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and limitations under the
* License.
*/

package io.confluent.ksql.function.udf.array;

import io.confluent.ksql.function.FunctionCategory;
import io.confluent.ksql.function.udf.Udf;
import io.confluent.ksql.function.udf.UdfDescription;
import io.confluent.ksql.function.udf.UdfParameter;
import java.util.ArrayList;
import java.util.List;


@UdfDescription(
name = "array_concat",
category = FunctionCategory.ARRAY,
description = "Concatenates two arrays, creating an array that contains all the elements"
+ " in the first array followed by all the elements in the second array."
+ " Returns NULL if both input arrays are NULL."
+ " If only one argument is NULL, the result is the other argument."
+ " The two arrays must be of the same type.")
public class ArrayConcat {
@Udf
public <T> List<T> concat(
@UdfParameter(description = "First array of values") final List<T> left,
@UdfParameter(description = "Second array of values") final List<T> right) {
if (left == null && right == null) {
return null;
}
final int leftSize = left != null ? left.size() : 0;
final int rightSize = right != null ? right.size() : 0;
final List<T> result = new ArrayList(leftSize + rightSize);
if (left != null) {
result.addAll(left);
}
if (right != null) {
result.addAll(right);
}
return result;
}
}
91 changes: 91 additions & 0 deletions ksqldb-engine/src/test/java/io/confluent/ksql/function/udf/array/ArrayConcatTest.java
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/*
* Copyright 2020 Confluent Inc.
*
* Licensed under the Confluent Community License; you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.confluent.io/confluent-community-license
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and limitations under the
* License.
*/

package io.confluent.ksql.function.udf.array;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.contains;

import com.google.common.collect.ImmutableMap;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import org.junit.Test;

public class ArrayConcatTest {

private final ArrayConcat udf = new ArrayConcat();

@Test
public void shouldConcatArraysOfLikeType() {
final List<String> input1 = Arrays.asList("foo", " ", "bar");
final List<String> input2 = Arrays.asList("baz");
final List<String> result = udf.concat(input1, input2);
assertThat(result, is(Arrays.asList("foo", " ", "bar", "baz")));
}

@Test
public void shouldReturnDuplicateValues() {
final List<String> input1 = Arrays.asList("foo", "foo", "bar");
final List<String> input2 = Arrays.asList("baz", "foo");
final List<String> result = udf.concat(input1, input2);
assertThat(result, is(Arrays.asList("foo", "foo", "bar", "baz", "foo")));
}

@Test
public void shouldConcatArraysContainingNulls() {
final List<String> input1 = Arrays.asList(null, "bar");
final List<String> input2 = Arrays.asList("foo");
final List<String> result = udf.concat(input1, input2);
assertThat(result, is(Arrays.asList(null, "bar", "foo")));
}

@Test
public void shouldConcatArraysBothContainingNulls() {
final List<String> input1 = Arrays.asList(null, "foo", "bar");
final List<String> input2 = Arrays.asList("foo", null);
final List<String> result = udf.concat(input1, input2);
assertThat(result, is(Arrays.asList(null, "foo", "bar", "foo", null)));
}

@Test
public void shouldConcatArraysOfOnlyNulls() {
final List<String> input1 = Arrays.asList(null, null);
final List<String> input2 = Arrays.asList(null, null, null);
final List<String> result = udf.concat(input1, input2);
assertThat(result, is(Arrays.asList(null, null, null, null, null)));
}

@Test
public void shouldReturnNonNullForNullRightInput() {
final List<String> input1 = Arrays.asList("foo");
final List<String> result = udf.concat(input1, null);
assertThat(result, is(Arrays.asList("foo")));
}

@Test
public void shouldReturnNullForNullLeftInput() {
final List<String> input1 = Arrays.asList("foo");
final List<String> result = udf.concat(null, input1);
assertThat(result, is(Arrays.asList("foo")));
}

@Test
public void shouldReturnNullForAllNullInputs() {
final List<Long> result = udf.concat((List<Long>) null, (List<Long>) null);
assertThat(result, is(nullValue()));
}
}
154 changes: 154 additions & 0 deletions ...cal_plans/array-set-functions_-_array_concat_with_both_null/7.0.0_1625738677323/plan.json
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{
"plan" : [ {
"@type" : "ksqlPlanV1",
"statementText" : "CREATE STREAM INPUT (ID STRING KEY, ARR1 ARRAY<INTEGER>, ARR2 ARRAY<INTEGER>) WITH (KAFKA_TOPIC='test_topic', KEY_FORMAT='KAFKA', VALUE_FORMAT='JSON');",
"ddlCommand" : {
"@type" : "createStreamV1",
"sourceName" : "INPUT",
"schema" : "`ID` STRING KEY, `ARR1` ARRAY<INTEGER>, `ARR2` ARRAY<INTEGER>",
"topicName" : "test_topic",
"formats" : {
"keyFormat" : {
"format" : "KAFKA"
},
"valueFormat" : {
"format" : "JSON"
}
},
"orReplace" : false
}
}, {
"@type" : "ksqlPlanV1",
"statementText" : "CREATE STREAM OUTPUT AS SELECT\n INPUT.ID ID,\n ARRAY_CONCAT(INPUT.ARR1, INPUT.ARR2) RESULT\nFROM INPUT INPUT\nEMIT CHANGES",
"ddlCommand" : {
"@type" : "createStreamV1",
"sourceName" : "OUTPUT",
"schema" : "`ID` STRING KEY, `RESULT` ARRAY<INTEGER>",
"topicName" : "OUTPUT",
"formats" : {
"keyFormat" : {
"format" : "KAFKA"
},
"valueFormat" : {
"format" : "JSON"
}
},
"orReplace" : false
},
"queryPlan" : {
"sources" : [ "INPUT" ],
"sink" : "OUTPUT",
"physicalPlan" : {
"@type" : "streamSinkV1",
"properties" : {
"queryContext" : "OUTPUT"
},
"source" : {
"@type" : "streamSelectV1",
"properties" : {
"queryContext" : "Project"
},
"source" : {
"@type" : "streamSourceV1",
"properties" : {
"queryContext" : "KsqlTopic/Source"
},
"topicName" : "test_topic",
"formats" : {
"keyFormat" : {
"format" : "KAFKA"
},
"valueFormat" : {
"format" : "JSON"
}
},
"sourceSchema" : "`ID` STRING KEY, `ARR1` ARRAY<INTEGER>, `ARR2` ARRAY<INTEGER>"
},
"keyColumnNames" : [ "ID" ],
"selectExpressions" : [ "ARRAY_CONCAT(ARR1, ARR2) AS RESULT" ]
},
"formats" : {
"keyFormat" : {
"format" : "KAFKA"
},
"valueFormat" : {
"format" : "JSON"
}
},
"topicName" : "OUTPUT"
},
"queryId" : "CSAS_OUTPUT_0"
}
} ],
"configs" : {
"ksql.extension.dir" : "ext",
"ksql.streams.cache.max.bytes.buffering" : "0",
"ksql.security.extension.class" : null,
"metric.reporters" : "",
"ksql.transient.prefix" : "transient_",
"ksql.query.status.running.threshold.seconds" : "300",
"ksql.streams.default.deserialization.exception.handler" : "io.confluent.ksql.errors.LogMetricAndContinueExceptionHandler",
"ksql.output.topic.name.prefix" : "",
"ksql.query.pull.enable.standby.reads" : "false",
"ksql.persistence.default.format.key" : "KAFKA",
"ksql.query.persistent.max.bytes.buffering.total" : "-1",
"ksql.queryanonymizer.logs_enabled" : "true",
"ksql.query.error.max.queue.size" : "10",
"ksql.variable.substitution.enable" : "true",
"ksql.internal.topic.min.insync.replicas" : "1",
"ksql.streams.shutdown.timeout.ms" : "300000",
"ksql.internal.topic.replicas" : "1",
"ksql.insert.into.values.enabled" : "true",
"ksql.query.pull.max.allowed.offset.lag" : "9223372036854775807",
"ksql.query.pull.max.qps" : "2147483647",
"ksql.access.validator.enable" : "auto",
"ksql.streams.bootstrap.servers" : "localhost:0",
"ksql.queryanonymizer.cluster_namespace" : null,
"ksql.query.pull.metrics.enabled" : "true",
"ksql.create.or.replace.enabled" : "true",
"ksql.metrics.extension" : null,
"ksql.hidden.topics" : "_confluent.*,__confluent.*,_schemas,__consumer_offsets,__transaction_state,connect-configs,connect-offsets,connect-status,connect-statuses",
"ksql.cast.strings.preserve.nulls" : "true",
"ksql.authorization.cache.max.entries" : "10000",
"ksql.pull.queries.enable" : "true",
"ksql.lambdas.enabled" : "true",
"ksql.query.pull.max.hourly.bandwidth.megabytes" : "2147483647",
"ksql.suppress.enabled" : "false",
"ksql.query.push.scalable.enabled" : "false",
"ksql.query.push.scalable.interpreter.enabled" : "true",
"ksql.sink.window.change.log.additional.retention" : "1000000",
"ksql.readonly.topics" : "_confluent.*,__confluent.*,_schemas,__consumer_offsets,__transaction_state,connect-configs,connect-offsets,connect-status,connect-statuses",
"ksql.query.persistent.active.limit" : "2147483647",
"ksql.persistence.wrap.single.values" : null,
"ksql.authorization.cache.expiry.time.secs" : "30",
"ksql.query.retry.backoff.initial.ms" : "15000",
"ksql.query.transient.max.bytes.buffering.total" : "-1",
"ksql.schema.registry.url" : "",
"ksql.properties.overrides.denylist" : "",
"ksql.query.pull.max.concurrent.requests" : "2147483647",
"ksql.streams.auto.offset.reset" : "earliest",
"ksql.connect.url" : "http://localhost:8083",
"ksql.service.id" : "some.ksql.service.id",
"ksql.streams.default.production.exception.handler" : "io.confluent.ksql.errors.ProductionExceptionHandlerUtil$LogAndFailProductionExceptionHandler",
"ksql.query.pull.interpreter.enabled" : "true",
"ksql.streams.commit.interval.ms" : "2000",
"ksql.query.pull.table.scan.enabled" : "false",
"ksql.streams.auto.commit.interval.ms" : "0",
"ksql.streams.topology.optimization" : "all",
"ksql.query.retry.backoff.max.ms" : "900000",
"ksql.streams.num.stream.threads" : "4",
"ksql.timestamp.throw.on.invalid" : "false",
"ksql.metrics.tags.custom" : "",
"ksql.persistence.default.format.value" : null,
"ksql.udfs.enabled" : "true",
"ksql.udf.enable.security.manager" : "true",
"ksql.connect.worker.config" : "",
"ksql.nested.error.set.null" : "true",
"ksql.udf.collect.metrics" : "false",
"ksql.query.pull.thread.pool.size" : "100",
"ksql.persistent.prefix" : "query_",
"ksql.metastore.backup.location" : "",
"ksql.error.classifier.regex" : "",
"ksql.suppress.buffer.size.bytes" : "-1"
}
}
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