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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_column_conv.h
+++ b/src/sql/engine/expr/ob_expr_column_conv.h
@ -0,0 +1,129 @@
+/**
+ * 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_COLUMN_CONV_H_
+#define _OB_SQL_EXPR_COLUMN_CONV_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "sql/engine/expr/ob_postfix_expression.h"
+
+namespace oceanbase {
+namespace sql {
+
+class ObBaseExprColumnConv {
+  public:
+  ObBaseExprColumnConv(common::ObIAllocator& alloc) : alloc_(alloc), str_values_(alloc_)
+  {}
+  virtual ~ObBaseExprColumnConv()
+  {}
+
+  const common::ObIArray<common::ObString>& get_str_values() const
+  {
+    return str_values_;
+  }
+
+  // this func is used in resolver
+  int shallow_copy_str_values(const common::ObIArray<common::ObString>& str_values);
+  // this func is used in code generator
+  int deep_copy_str_values(const common::ObIArray<common::ObString>& str_values);
+
+  ObBaseExprColumnConv(const ObBaseExprColumnConv& other) = delete;
+  ObBaseExprColumnConv& operator=(const ObBaseExprColumnConv& other) = delete;
+
+  protected:
+  common::ObIAllocator& alloc_;
+  common::ObFixedArray<common::ObString, common::ObIAllocator> str_values_;
+};
+
+// fast column convert is a optimized form of OExprColumnConvert
+class ObFastColumnConvExpr : public ObBaseExprColumnConv, public ObFastExprOperator {
+  public:
+  explicit ObFastColumnConvExpr(common::ObIAllocator& alloc);
+  virtual ~ObFastColumnConvExpr()
+  {}
+  int assign(const ObFastExprOperator& other);
+  virtual int calc(common::ObExprCtx& expr_ctx, const common::ObNewRow& row, common::ObObj& result) const;
+  OB_INLINE void set_column_type(const ObExprResType& column_type)
+  {
+    column_type_ = column_type;
+  }
+  OB_INLINE const ObExprResType& get_column_type() const
+  {
+    return column_type_;
+  }
+  OB_INLINE void set_column(int64_t column_index)
+  {
+    value_item_.set_column(column_index);
+  }
+  int set_const_value(const common::ObObj& value);
+  OB_INLINE void set_value_accuracy(const common::ObAccuracy& accuracy)
+  {
+    value_item_.set_accuracy(accuracy);
+  }
+  OB_INLINE int set_column_info(const ObString& column_info)
+  {
+    return ob_write_string(alloc_, column_info, column_info_);
+  }
+  OB_INLINE bool has_column_info() const
+  {
+    return !column_info_.empty();
+  }
+  OB_INLINE const ObString& get_column_info() const
+  {
+    return column_info_;
+  }
+  VIRTUAL_TO_STRING_KV(K_(column_type), K_(value_item), K_(column_info));
+
+  private:
+  ObExprResType column_type_;
+  ObPostExprItem value_item_;
+  ObString column_info_;
+};
+
+class ObExprColumnConv : public ObBaseExprColumnConv, public ObFuncExprOperator {
+  OB_UNIS_VERSION_V(1);
+
+  public:
+  // objs[0]  type
+  // objs[1] collation_type
+  // objs[2] accuray_expr
+  // objs[3] nullable_expr
+  // objs[4] value
+  // objs[5] column_info
+  enum PARAMS_EXPLAIN { TYPE, COLLATION_TYPE, ACCURITY, NULLABLE, VALUE_EXPR, COLUMN_INFO, PARAMS_MAX };
+
+  static const int64_t PARAMS_COUNT_WITHOUT_COLUMN_INFO = 5;
+  static const int64_t PARAMS_COUNT_WITH_COLUMN_INFO = 6;
+
+  public:
+  explicit ObExprColumnConv(common::ObIAllocator& alloc);
+  virtual ~ObExprColumnConv();
+  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& ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+  static int convert_with_null_check(common::ObObj& result, const common::ObObj& obj, const ObExprResType& res_type,
+      bool is_strict, common::ObCastCtx& cast_ctx, const common::ObIArray<ObString>* type_infos = NULL);
+  static int convert_skip_null_check(common::ObObj& result, const common::ObObj& obj, const ObExprResType& res_type,
+      bool is_strict, common::ObCastCtx& cast_ctx, const common::ObIArray<ObString>* type_infos = NULL,
+      const ObString* column_info = NULL);
+  static int column_convert(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& datum);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprColumnConv) const;
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* _OB_SQL_EXPR_COLUMN_CONV_H_ */