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src/sql/engine/expr/ob_expr_regexp_substr.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_REGEXP_SUBSTR_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_REGEXP_SUBSTR_
+
+#include "lib/string/ob_string.h"
+#include "sql/engine/expr/ob_expr_regexp_context.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprRegexpSubstr : public ObStringExprOperator {
+  public:
+  explicit ObExprRegexpSubstr(common::ObIAllocator& alloc);
+  virtual ~ObExprRegexpSubstr();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+
+  static int eval_regexp_substr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  static int calc(common::ObString& result, bool& is_null, const common::ObString& text,
+      const common::ObString& pattern, int64_t position, int64_t occurrence, const common::ObCollationType cs_type,
+      const common::ObString& match_param, int64_t subexpr, bool has_null_argument, ObExprRegexContext* regexp_ptr,
+      common::ObExprStringBuf& string_buf);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprRegexpSubstr);
+};
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_REGEXP_SUBSTR_ */