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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_cast.h
+++ b/src/sql/engine/expr/ob_expr_cast.h
@ -0,0 +1,94 @@
+/**
+ * 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_CAST_H_
+#define _OB_EXPR_CAST_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+
+// TODO::only support 26??
+static const int32_t CAST_STRING_DEFUALT_LENGTH[26] = {
+    0,   // null
+    4,   // tinyint
+    6,   // smallint
+    9,   // medium
+    11,  // int32
+    20,  // int
+    3,   // utinyint
+    5,   // usmallint
+    8,   // umedium
+    10,  // uint32
+    20,  // uint
+    12,  // float
+    23,  // double  here we set it larger than mysql, mysql is 22, sometimes it is 23,for safely.we set 23.
+    12,  // ufloat
+    23,  // udouble
+    11,  // decimal
+    11,  // decimal
+    19,  // datetime
+    19,  // timestamp
+    10,  // date
+    10,  // time
+    4,   // year
+    1,   // varchar
+    1,   // char
+    1,   // binary
+    0    // extend
+};
+
+class ObExprCast : public ObFuncExprOperator {
+  OB_UNIS_VERSION_V(1);
+  const static int32_t OB_LITERAL_MAX_INT_LEN = 21;
+
+  public:
+  ObExprCast();
+  explicit ObExprCast(common::ObIAllocator& alloc);
+  virtual ~ObExprCast(){};
+
+  virtual int calc_result_type2(
+      ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const;
+
+  virtual int calc_result2(
+      common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const;
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+
+  // extra_serialize_ == 1 : is implicit cast
+  void set_implicit_cast(bool v)
+  {
+    extra_serialize_ = v ? 1 : 0;
+  }
+
+  private:
+  int check_target_type_precision_valid(const ObExprResType& type, const common::ObCastMode cast_mode) const;
+  int get_cast_type(const ObExprResType param_type2, ObExprResType& dst_type) const;
+  int get_explicit_cast_cm(const ObExprResType& src_type, const ObExprResType& dst_type,
+      const ObSQLSessionInfo& session, const ObRawExpr& cast_raw_expr, common::ObCastMode& cast_mode) const;
+
+  private:
+  int get_cast_string_len(ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx, int32_t& res_len,
+      int16_t& length_semantics, common::ObCollationType conn) const;
+  int get_cast_inttc_len(ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx, int32_t& res_len,
+      int16_t& length_semantics, common::ObCollationType conn) const;
+  int do_implicit_cast(common::ObExprCtx& expr_ctx, const common::ObCastMode& cast_mode,
+      const common::ObObjType& dst_type, const common::ObObj& src_obj, common::ObObj& dst_obj) const;
+  // disallow copy
+  ObExprCast(const ObExprCast& other);
+  ObExprCast& operator=(const ObExprCast& other);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* _OB_EXPR_CAST_H_ */