feat: 添加查询列和查询条件相互转换的适配器。

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryColumnAdapter.java

@@ -0,0 +1,42 @@
+package com.mybatisflex.core.query;
+
+import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.exception.FlexAssert;
+
+import java.util.List;
+
+/**
+ * {@link QueryColumn} 适配器，用于将 {@link QueryCondition} 转换为 {@link QueryColumn}。
+ *
+ * @author 王帅
+ * @since 2024-09-29
+ */
+public class QueryColumnAdapter extends QueryColumn implements HasParamsColumn {
+
+    private final QueryCondition condition;
+
+    public QueryColumnAdapter(QueryCondition condition) {
+        FlexAssert.notNull(condition, "condition");
+        this.condition = condition;
+    }
+
+    public QueryCondition getCondition() {
+        return condition;
+    }
+
+    @Override
+    public Object[] getParamValues() {
+        return WrapperUtil.getValues(condition);
+    }
+
+    @Override
+    String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
+        return condition.toSql(queryTables, dialect) + WrapperUtil.buildColumnAlias(alias, dialect);
+    }
+
+    @Override
+    String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
+        return condition.toSql(queryTables, dialect);
+    }
+
+}

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryConditionAdapter.java

@@ -0,0 +1,31 @@
+package com.mybatisflex.core.query;
+
+import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.exception.FlexAssert;
+
+import java.util.List;
+
+/**
+ * {@link QueryCondition} 适配器，用于将 {@link QueryColumn} 转换为 {@link QueryCondition}。
+ *
+ * @author 王帅
+ * @since 2024-09-29
+ */
+public class QueryConditionAdapter extends QueryCondition {
+
+    public QueryConditionAdapter(QueryColumn column) {
+        FlexAssert.notNull(column, "column");
+        super.column = column;
+    }
+
+    @Override
+    public Object getValue() {
+        return column instanceof HasParamsColumn ? ((HasParamsColumn) column).getParamValues() : null;
+    }
+
+    @Override
+    public String toSql(List<QueryTable> queryTables, IDialect dialect) {
+        return column.toConditionSql(queryTables, dialect);
+    }
+
+}