[feature](scalar-fn) Support gamma scalar function

be/src/vec/functions/math.cpp

@@ -48,6 +48,11 @@
 
 namespace doris::vectorized {
 
+struct GammaName {
+    static constexpr auto name = "gamma";
+};
+using FunctionGamma = FunctionMathUnary<UnaryFunctionPlain<GammaName, std::tgamma>>;
+
 struct AcosName {
     static constexpr auto name = "acos";
     // https://dev.mysql.com/doc/refman/8.4/en/mathematical-functions.html#function_acos
@@ -991,5 +996,6 @@ void register_function_math(SimpleFunctionFactory& factory) {
     factory.register_function<FunctionMathBinary<LcmImpl<TYPE_LARGEINT>>>();
     factory.register_function<FunctionIsNan>();
     factory.register_function<FunctionIsInf>();
+    factory.register_function<FunctionGamma>();
 }
 } // namespace doris::vectorized

fe/fe-core/src/main/java/org/apache/doris/catalog/BuiltinScalarFunctions.java

@@ -223,6 +223,7 @@
 import org.apache.doris.nereids.trees.expressions.functions.scalar.FromSecond;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.FromUnixtime;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.G;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.Gamma;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.Gcd;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.GetFormat;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.GetVariantType;
@@ -769,6 +770,7 @@ public class BuiltinScalarFunctions implements FunctionHelper {
             scalar(FromIso8601Date.class, "from_iso8601_date"),
             scalar(FromUnixtime.class, "from_unixtime"),
             scalar(G.class, "g"),
+            scalar(Gamma.class, "gamma"),
             scalar(Gcd.class, "gcd"),
             scalar(GetFormat.class, "get_format"),
             scalar(GetVariantType.class, "variant_type"),

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/Gamma.java

@@ -0,0 +1,73 @@
+// 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.doris.nereids.trees.expressions.functions.scalar;
+
+import org.apache.doris.catalog.FunctionSignature;
+import org.apache.doris.nereids.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
+import org.apache.doris.nereids.trees.expressions.functions.PropagateNullable;
+import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression;
+import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
+import org.apache.doris.nereids.types.DoubleType;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+
+/**
+ * ScalarFunction 'gamma'. This class is generated by GenerateFunction.
+ */
+public class Gamma extends ScalarFunction
+        implements UnaryExpression, ExplicitlyCastableSignature, PropagateNullable {
+
+    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
+            FunctionSignature.ret(DoubleType.INSTANCE).args(DoubleType.INSTANCE)
+    );
+
+    /**
+     * constructor with 1 argument.
+     */
+    public Gamma(Expression arg) {
+        super("gamma", arg);
+    }
+
+    /** constructor for withChildren and reuse signature */
+    private Gamma(ScalarFunctionParams functionParams) {
+        super(functionParams);
+    }
+
+    /**
+     * withChildren.
+     */
+    @Override
+    public Gamma withChildren(List<Expression> children) {
+        Preconditions.checkArgument(children.size() == 1);
+        return new Gamma(getFunctionParams(children));
+    }
+
+    @Override
+    public List<FunctionSignature> getSignatures() {
+        return SIGNATURES;
+    }
+
+    @Override
+    public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
+        return visitor.visitGamma(this, context);
+    }
+}

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/visitor/ScalarFunctionVisitor.java

@@ -233,6 +233,7 @@
 import org.apache.doris.nereids.trees.expressions.functions.scalar.FromIso8601Date;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.FromUnixtime;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.G;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.Gamma;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.Gcd;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.GetFormat;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.GetVariantType;
@@ -1401,6 +1402,10 @@ default R visitG(G g, C context) {
         return visitScalarFunction(g, context);
     }
 
+    default R visitGamma(Gamma gamma, C context) {
+        return visitScalarFunction(gamma, context);
+    }
+
     default R visitGcd(Gcd gcd, C context) {
         return visitScalarFunction(gcd, context);
     }