[FEAT MERGE]4_1_sql_feature

Co-authored-by: leslieyuchen <leslieyuchen@gmail.com>
Co-authored-by: Charles0429 <xiezhenjiang@gmail.com>
Co-authored-by: raywill <hustos@gmail.com>

src/sql/engine/expr/ob_expr_icu_version.h

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_ICU_VERSION_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_ICU_VERSION_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase
+{
+namespace sql
+{
+// MySQL function
+// The version of the International Components for Unicode (ICU) library used to support
+// regular expression operations. This function is primarily intended for use in test cases.
+class ObExprICUVersion : public ObStringExprOperator
+{
+public:
+  explicit ObExprICUVersion(common::ObIAllocator &alloc);
+  virtual ~ObExprICUVersion();
+  virtual int calc_result_type0(ObExprResType &type, common::ObExprTypeCtx &type_ctx) const;
+
+  static int eval_version(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
+  virtual int cg_expr(ObExprCGCtx &op_cg_ctx,
+                      const ObRawExpr &raw_expr,
+                      ObExpr &rt_expr) const override;
+};
+}
+}
+#endif /* OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_OBVERSION_ */