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src/sql/engine/expr/ob_expr_orahash.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 OB_EXPR_ORAHASH
+#define OB_EXPR_ORAHASH
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprOrahash : public ObFuncExprOperator {
+  public:
+  explicit ObExprOrahash(common::ObIAllocator& alloc);
+  virtual ~ObExprOrahash();
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+
+  static int eval_orahash(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& expr) const override;
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprOrahash);
+
+  int get_int64_value(const common::ObObj& obj, common::ObExprCtx& expr_ctx, int64_t& val) const;
+  bool is_applicable_type(const common::ObObj& intput) const;
+  static bool is_valid_number(const int64_t& input);
+  bool is_any_null(const common::ObObj* objs, const int64_t num) const;
+  uint64_t hash_mod_oracle(uint64_t val, uint64_t buckets) const;
+
+  static const int64_t MAX_BUCKETS = 4294967295;  // buckets and seed share the same max value;
+};
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif