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new 0e7f864c4d [INLONG-11147][SDK] Transform support CASE Operator (#11184)
0e7f864c4d is described below
commit 0e7f864c4da363d4ec3925d19b635f54a7a60b74
Author: Xincheng Huang <[email protected]>
AuthorDate: Tue Sep 24 12:05:51 2024 +0800
[INLONG-11147][SDK] Transform support CASE Operator (#11184)
---
.../sdk/transform/process/parser/CaseParser.java | 92 ++++++++++++
.../function/flowcontrol/TestCaseFunction.java | 165 +++++++++++++++++++++
2 files changed, 257 insertions(+)
diff --git
a/inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/parser/CaseParser.java
b/inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/parser/CaseParser.java
new file mode 100644
index 0000000000..de140174db
--- /dev/null
+++
b/inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/parser/CaseParser.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.parser;
+
+import org.apache.inlong.sdk.transform.decode.SourceData;
+import org.apache.inlong.sdk.transform.process.Context;
+import org.apache.inlong.sdk.transform.process.operator.ExpressionOperator;
+import org.apache.inlong.sdk.transform.process.operator.OperatorTools;
+
+import net.sf.jsqlparser.expression.CaseExpression;
+import net.sf.jsqlparser.expression.WhenClause;
+
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * CASE value WHEN compare_value THEN result [WHEN compare_value THEN result
...] [ELSE result] END
+ * CASE WHEN condition THEN result [WHEN condition THEN result ...] [ELSE
result] END
+ *
+ * The first CASE syntax returns the result for the first value=compare_value
comparison that is true.
+ * The second syntax returns the result for the first condition that is true.
+ * If no comparison or condition is true, the result after ELSE is returned,
or NULL if there is no ELSE part.
+ */
+@TransformParser(values = CaseExpression.class)
+public class CaseParser implements ValueParser {
+
+ private final ValueParser switchValue;
+ private final List<CaseWhen> caseWhens;
+ private final ValueParser elseResult;
+
+ public CaseParser(CaseExpression expr) {
+ this.switchValue =
OperatorTools.buildParser(expr.getSwitchExpression());
+ this.caseWhens = new ArrayList<>();
+ this.elseResult = OperatorTools.buildParser(expr.getElseExpression());
+ for (WhenClause whenClause : expr.getWhenClauses()) {
+ Object condition = null;
+ if (switchValue == null) {
+ condition =
OperatorTools.buildOperator(whenClause.getWhenExpression());
+ } else {
+ condition =
OperatorTools.buildParser(whenClause.getWhenExpression());
+ }
+ ValueParser result =
OperatorTools.buildParser(whenClause.getThenExpression());
+ this.caseWhens.add(new CaseWhen(condition, result));
+ }
+ }
+
+ @SuppressWarnings("rawtypes")
+ @Override
+ public Object parse(SourceData sourceData, int rowIndex, Context context) {
+ if (switchValue == null) {
+ for (CaseWhen caseWhen : caseWhens) {
+ if (((ExpressionOperator)
caseWhen.condition).check(sourceData, rowIndex, context)) {
+ return caseWhen.result.parse(sourceData, rowIndex,
context);
+ }
+ }
+ } else {
+ for (CaseWhen caseWhen : caseWhens) {
+ Comparable left = (Comparable) switchValue.parse(sourceData,
rowIndex, context);
+ Comparable right = (Comparable) ((ValueParser)
caseWhen.condition).parse(sourceData, rowIndex, context);
+ if (OperatorTools.compareValue(left, right) == 0) {
+ return caseWhen.result.parse(sourceData, rowIndex,
context);
+ }
+ }
+ }
+ return elseResult == null ? null : elseResult.parse(sourceData,
rowIndex, context);
+ }
+
+ private static class CaseWhen {
+
+ private final Object condition;
+ private final ValueParser result;
+
+ public CaseWhen(Object condition, ValueParser result) {
+ this.condition = condition;
+ this.result = result;
+ }
+ }
+}
\ No newline at end of file
diff --git
a/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/flowcontrol/TestCaseFunction.java
b/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/flowcontrol/TestCaseFunction.java
new file mode 100644
index 0000000000..29d77e45c8
--- /dev/null
+++
b/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/flowcontrol/TestCaseFunction.java
@@ -0,0 +1,165 @@
+/*
+ * 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.flowcontrol;
+
+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.apache.inlong.sdk.transform.process.function.arithmetic.AbstractFunctionArithmeticTestBase;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.List;
+
+public class TestCaseFunction extends AbstractFunctionArithmeticTestBase {
+
+ @Test
+ public void testCaseFunction() throws Exception {
+ String transformSql = null, data = null;
+ TransformConfig config = null;
+ TransformProcessor<String, String> processor = null;
+ List<String> output = null;
+
+ // case1: CASE WHEN numeric1 > numeric2 THEN 'greater' ELSE 'lesser'
END
+ transformSql = "select case " +
+ "when numeric1 > numeric2 then 'greater' " +
+ "else 'lesser' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "5|3|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=greater", output.get(0));
+
+ // case2: CASE numeric1 WHEN 5 THEN 'five' ELSE 'other' END
+ transformSql = "select case numeric1 " +
+ "when 5 then 'five' " +
+ "else 'other' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "5|0|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=five", output.get(0));
+
+ // case3: CASE numeric1 WHEN 3 THEN 'three' WHEN 5 THEN 'five' ELSE
'other' END
+ transformSql = "select case numeric1 " +
+ "when 3 then 'three' " +
+ "when 5 then 'five' " +
+ "else 'other' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "6|0|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=other", output.get(0));
+
+ // case4: CASE WHEN numeric1 >= 90 THEN 'Excellent' WHEN numeric1 >=
80 THEN 'Good' WHEN numeric1 >= 60 THEN
+ // 'Pass' ELSE 'Fail' END
+ transformSql = "select case " +
+ "when numeric1 >= 90 then 'Excellent' " +
+ "when numeric1 >= 80 then 'Good' " +
+ "when numeric1 >= 60 then 'Pass' " +
+ "else 'Fail' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "85|0|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=Good", output.get(0));
+
+ // case5: CASE WHEN numeric1 = 5 THEN 'five' WHEN numeric1 > 3 THEN
'greater' END
+ transformSql = "select case " +
+ "when numeric1 = 5 then 'five' " +
+ "when numeric1 > 3 then 'greater' " +
+ "end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "5|0|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=five", output.get(0));
+
+ // case6: CASE numeric1 + numeric2 WHEN 3 THEN 3 WHEN 5 THEN 'five'
WHEN 5.4 THEN 5.4 ELSE 'other' END
+ transformSql = "select case numeric1 + numeric2 " +
+ "when 3 then 3 " +
+ "when 5 then 'five' " +
+ "when 5.4 then 5.4 " +
+ "else 'other' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "3.2|2.2|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=5.4", output.get(0));
+
+ // case7: CASE numeric1 / numeric2 WHEN 3 THEN 'three' WHEN 5 THEN
'five' ELSE 'other' END
+ transformSql = "select case numeric1 / numeric2 " +
+ "when 3 then 'three' " +
+ "when 5 then 'five' " +
+ "else 'other' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "3|0|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=", output.get(0));
+
+ // case8: Nested CASE Expression
+ transformSql = "select case " +
+ "when numeric1 >= 90 then 'Excellent' " +
+ "when numeric1 >= 80 then 'Good' " +
+ "when numeric1 >= 60 then case " +
+ "when numeric2 >= 70 then 'Pass with Merit' " +
+ "else 'Pass' end " +
+ "else 'Fail' end " +
+ "from source";
+ config = new TransformConfig(transformSql);
+ processor = TransformProcessor
+ .create(config,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ data = "65|75|3|5";
+ output = processor.transform(data, new HashMap<>());
+ Assert.assertEquals(1, output.size());
+ Assert.assertEquals("result=Pass with Merit", output.get(0));
+ }
+}
\ No newline at end of file
