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new 0ccc1fc986 [INLONG-11219][SDK] Transform support COALESCE() function
(#11254)
0ccc1fc986 is described below
commit 0ccc1fc986184f80927f7d72ce5166cba1daf4c6
Author: emptyOVO <[email protected]>
AuthorDate: Tue Oct 8 12:54:43 2024 +0800
[INLONG-11219][SDK] Transform support COALESCE() function (#11254)
---
.../process/function/CoalesceFunction.java | 92 +++++++++++++++++++++
.../function/string/TestCoalesceFunction.java | 94 ++++++++++++++++++++++
2 files changed, 186 insertions(+)
diff --git
a/inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/CoalesceFunction.java
b/inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/CoalesceFunction.java
new file mode 100644
index 0000000000..dc5032dc44
--- /dev/null
+++
b/inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/CoalesceFunction.java
@@ -0,0 +1,92 @@
+/*
+ * 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.inlong.sdk.transform.process.function;
+
+import org.apache.inlong.sdk.transform.decode.SourceData;
+import org.apache.inlong.sdk.transform.process.Context;
+import org.apache.inlong.sdk.transform.process.operator.OperatorTools;
+import org.apache.inlong.sdk.transform.process.parser.ValueParser;
+
+import net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.math.BigDecimal;
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * CoalesceFunction
+ * description: COALESCE(value1 [, value2]*)--Returns the first argument that
is not NULL.If all arguments are NULL,
+ * it returns NULL as well. The return type is the least
restrictive, common type of all of its arguments.
+ * The return type is nullable if all arguments are nullable as
well.
+ * for example: COALESCE(f0, f1, 'default') -- Returns the first non-null
value among f0 and f1,
+ * or 'default' if f0 and f1 are both NULL
+ */
+@TransformFunction(names = {"coalesce"})
+public class CoalesceFunction implements ValueParser {
+
+ private List<ValueParser> parserList;
+
+ public CoalesceFunction(Function expr) {
+ if (expr.getParameters() == null) {
+ this.parserList = new ArrayList<>();
+ } else {
+ List<Expression> params = expr.getParameters().getExpressions();
+ parserList = new ArrayList<>(params.size());
+ for (Expression param : params) {
+ ValueParser node = OperatorTools.buildParser(param);
+ parserList.add(node);
+ }
+ }
+ }
+
+ @Override
+ public Object parse(SourceData sourceData, int rowIndex, Context context) {
+ for (ValueParser node : parserList) {
+ Object parseObj = node.parse(sourceData, rowIndex, context);
+ Object valueObj = parseValue(parseObj);
+ if (valueObj != null) {
+ return parseValue(parseObj);
+ }
+ }
+ return null;
+ }
+
+ private Object parseValue(Object value) {
+ Object parsedValue;
+ if (value instanceof BigDecimal) {
+ parsedValue = OperatorTools.parseBigDecimal(value);
+ } else if (value instanceof Timestamp) {
+ parsedValue = OperatorTools.parseTimestamp(value);
+ } else if (value instanceof Date) {
+ parsedValue = OperatorTools.parseDate(value);
+ } else if (value instanceof byte[]) {
+ parsedValue = OperatorTools.parseBytes(value);
+ } else {
+ parsedValue = OperatorTools.parseString(value);
+ }
+ // invalid
+ if (parsedValue instanceof String && ((String) parsedValue).isEmpty())
{
+ return null;
+ }
+
+ return parsedValue;
+ }
+}
diff --git
a/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestCoalesceFunction.java
b/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestCoalesceFunction.java
new file mode 100644
index 0000000000..a6288e73af
--- /dev/null
+++
b/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestCoalesceFunction.java
@@ -0,0 +1,94 @@
+/*
+ * 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.inlong.sdk.transform.process.function.string;
+
+import org.apache.inlong.sdk.transform.decode.SourceDecoderFactory;
+import org.apache.inlong.sdk.transform.encode.SinkEncoderFactory;
+import org.apache.inlong.sdk.transform.pojo.TransformConfig;
+import org.apache.inlong.sdk.transform.process.TransformProcessor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.List;
+
+public class TestCoalesceFunction extends AbstractFunctionStringTestBase {
+
+ @Test
+ public void testCoalesceFunction() throws Exception {
+ String transformSql1 = "select coalesce(string1, string2, string3)
from source";
+ TransformConfig config1 = new TransformConfig(transformSql1);
+ TransformProcessor<String, String> processor1 = TransformProcessor
+ .create(config1,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+
+ // case1: coalesce('Transform SQL', 'SQL', 'hh')
+ List<String> output1 = processor1.transform("Transform SQL|SQL|hh",
new HashMap<>());
+ Assert.assertEquals(1, output1.size());
+ Assert.assertEquals(output1.get(0), "result=Transform SQL");
+
+ // case2: coalesce('', 'SQL', 'hh')
+ List<String> output2 = processor1.transform("|SQL|hh", new
HashMap<>());
+ Assert.assertEquals(1, output2.size());
+ Assert.assertEquals(output2.get(0), "result=SQL");
+
+ // case2: coalesce('', '', 'hh')
+ List<String> output3 = processor1.transform("||hh", new HashMap<>());
+ Assert.assertEquals(1, output3.size());
+ Assert.assertEquals(output3.get(0), "result=hh");
+
+ String transformSql2 = "select coalesce(string1, string2) from source";
+ TransformConfig config2 = new TransformConfig(transformSql2);
+ TransformProcessor<String, String> processor2 = TransformProcessor
+ .create(config2,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+
+ // case3: coalesce('', '')
+ List<String> output4 = processor2.transform("|", new HashMap<>());
+ Assert.assertEquals(1, output4.size());
+ Assert.assertEquals(output4.get(0), "result=");
+
+ // case4: coalesce('Transform SQL', 'Transformer')
+ List<String> output5 = processor2.transform("Transform
SQL|Transformer", new HashMap<>());
+ Assert.assertEquals(1, output5.size());
+ Assert.assertEquals(output5.get(0), "result=Transform SQL");
+
+ // case5: coalesce('', 'm S')
+ List<String> output6 = processor2.transform("|m S", new HashMap<>());
+ Assert.assertEquals(1, output6.size());
+ Assert.assertEquals(output6.get(0), "result=m S");
+
+ String transformSql3 = "select coalesce(string1) from source";
+ TransformConfig config3 = new TransformConfig(transformSql3);
+ TransformProcessor<String, String> processor3 = TransformProcessor
+ .create(config3,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+
+ // case6: coalesce('')
+ List<String> output7 = processor3.transform("", new HashMap<>());
+ Assert.assertEquals(1, output7.size());
+ Assert.assertEquals(output7.get(0), "result=");
+
+ // case6: coalesce('inlong')
+ List<String> output8 = processor3.transform("inlong", new HashMap<>());
+ Assert.assertEquals(1, output8.size());
+ Assert.assertEquals(output8.get(0), "result=inlong");
+
+ }
+}
