[INLONG-11002][SDK] Transform SQL support Fibonacci function

inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/arithmetic/FibonacciFunction.java

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+/*
+ * 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.arithmetic;
+
+import org.apache.inlong.sdk.transform.decode.SourceData;
+import org.apache.inlong.sdk.transform.process.Context;
+import org.apache.inlong.sdk.transform.process.function.FunctionConstant;
+import org.apache.inlong.sdk.transform.process.function.TransformFunction;
+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.util.List;
+
+/**
+ * FibonacciFunction  ->  fibonacci(numeric)
+ * Description:
+ * - Return NULL if 'numeric' is NULL;
+ * - Returns the nth Fibonacci number
+ */
+@TransformFunction(type = FunctionConstant.ARITHMETIC_TYPE, names = {
+        "fibonacci"}, parameter = "(Numeric numeric)", descriptions = {
+                "- Return NULL if 'numeric' is NULL;",
+                "- Returns the nth Fibonacci number"
+        }, examples = {"fibonacci(0) = 0", "fibonacci(1) = 1", "fibonacci(2) = 1", "fibonacci(3) = 2",
+                "fibonacci(4) = 3"})
+public class FibonacciFunction implements ValueParser {
+
+    private ValueParser numberParser;
+
+    public FibonacciFunction(Function expr) {
+        if (expr.getParameters() != null) {
+            List<Expression> expressions = expr.getParameters().getExpressions();
+            if (expressions != null && expressions.size() == 1) {
+                numberParser = OperatorTools.buildParser(expressions.get(0));
+            }
+        }
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        Object numberObj = numberParser.parse(sourceData, rowIndex, context);
+        BigDecimal numberValue = OperatorTools.parseBigDecimal(numberObj);
+        return fibonacci(numberValue.intValue());
+    }
+
+    private long fibonacci(int n) {
+        if (n <= 1) {
+            return n;
+        }
+        long prev = 0, curr = 1;
+        for (int i = 2; i <= n; i++) {
+            long temp = curr;
+            curr = curr + prev;
+            prev = temp;
+        }
+        return curr;
+    }
+}

inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/arithmetic/TestFibonacciFunction.java

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+/*
+ * 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.arithmetic;
+
+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 TestFibonacciFunction extends AbstractFunctionArithmeticTestBase {
+
+    @Test
+    public void testFibonacciFunction() throws Exception {
+        String transformSql = "select fibonacci(numeric1) from source";
+        TransformConfig config = new TransformConfig(transformSql);
+        TransformProcessor<String, String> processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: fibonacci(0)
+        List<String> output1 = processor.transform("0|4|6|8", new HashMap<>());
+        Assert.assertEquals(1, output1.size());
+        Assert.assertEquals(output1.get(0), "result=0");
+
+        // case2: fibonacci(1)
+        List<String> output2 = processor.transform("1|4|6|8", new HashMap<>());
+        Assert.assertEquals(1, output2.size());
+        Assert.assertEquals(output2.get(0), "result=1");
+
+        // case3: fibonacci(7)
+        List<String> output3 = processor.transform("7|4|6|8", new HashMap<>());
+        Assert.assertEquals(1, output3.size());
+        Assert.assertEquals(output3.get(0), "result=13");
+
+        // case4: fibonacci(10)
+        List<String> output4 = processor.transform("10|4|6|8", new HashMap<>());
+        Assert.assertEquals(1, output4.size());
+        Assert.assertEquals(output4.get(0), "result=55");
+    }
+
+}