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2021-05-31 22:56:52 +08:00
commit cea7de1475
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--- a/src/sql/engine/expr/ob_expr_oracle_decode.h
+++ b/src/sql/engine/expr/ob_expr_oracle_decode.h
@ -0,0 +1,92 @@
+/**
+ * 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_SQL_EXPR_ORACLE_DECODE_H_
+#define _OB_SQL_EXPR_ORACLE_DECODE_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprOracleDecode : public ObExprOperator {
+  OB_UNIS_VERSION_V(1);
+
+  public:
+  explicit ObExprOracleDecode(common::ObIAllocator& alloc);
+  virtual ~ObExprOracleDecode();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  int no_cast_calc(common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num) const;
+  int calc_result_type_for_literal(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int eval_decode(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
+
+  public:
+  inline void set_cond_all_same_meta(bool all_same_meta);
+  inline void set_val_all_same_meta(bool all_same_meta);
+  static bool can_compare_directly(common::ObObjType type1, common::ObObjType type2);
+
+  private:
+  inline static int get_cmp_type(common::ObObjType& type, const common::ObObjType& type1,
+      const common::ObObjType& type2, const common::ObObjType& type3);
+  inline bool is_cond_all_same_meta() const;
+  inline bool is_val_all_same_meta() const;
+  inline bool need_no_cast() const;
+
+  private:
+  typedef uint32_t ObExprDecodeParamFlag;
+  static const uint32_t COND_ALL_SAME_META = 1U << 0;
+  static const uint32_t VAL_ALL_SAME_META = 1U << 1;
+  ObExprDecodeParamFlag param_flags_;
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprOracleDecode);
+};
+
+inline void ObExprOracleDecode::set_cond_all_same_meta(bool all_same_meta)
+{
+  if (all_same_meta) {
+    param_flags_ |= COND_ALL_SAME_META;
+  } else {
+    param_flags_ &= ~COND_ALL_SAME_META;
+  }
+}
+
+inline void ObExprOracleDecode::set_val_all_same_meta(bool all_same_meta)
+{
+  if (all_same_meta) {
+    param_flags_ |= VAL_ALL_SAME_META;
+  } else {
+    param_flags_ &= ~VAL_ALL_SAME_META;
+  }
+}
+
+inline bool ObExprOracleDecode::is_cond_all_same_meta() const
+{
+  return param_flags_ & COND_ALL_SAME_META;
+}
+
+inline bool ObExprOracleDecode::is_val_all_same_meta() const
+{
+  return param_flags_ & VAL_ALL_SAME_META;
+}
+
+inline bool ObExprOracleDecode::need_no_cast() const
+{
+  return is_cond_all_same_meta() && is_val_all_same_meta();
+}
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* _OB_SQL_EXPR_ORACLE_DECODE_H_ */