SelectFunc 字段别名

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/segments/Fun.java

@@ -0,0 +1,36 @@
+package com.github.yulichang.wrapper.segments;
+
+import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+/**
+ * 别名func
+ * <p>
+ * 仅对selectFunc有效
+ *
+ * @author yulichang
+ * @since 1.4.11
+ */
+@Getter
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+public class Fun<T, R> implements SFunction<T, R> {
+
+    private final String alias;
+    private final SFunction<T, R> func;
+
+    @Override
+    public R apply(T t) {
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 别名func
+     * <p>
+     * 仅对selectFunc有效
+     */
+    public static <T, R> Fun<T, R> f(String alias, SFunction<T, R> func) {
+        return new Fun<>(alias, func);
+    }
+}