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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_date_format.h
+++ b/src/sql/engine/expr/ob_expr_date_format.h
@ -0,0 +1,82 @@
+/**
+ * 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_OB_EXPR_DATE_FORMAT_H_
+#define OCEANBASE_SQL_OB_EXPR_DATE_FORMAT_H_
+
+#include "lib/timezone/ob_time_convert.h"
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprDateFormat : public ObStringExprOperator {
+  public:
+  explicit ObExprDateFormat(common::ObIAllocator& alloc);
+  virtual ~ObExprDateFormat();
+  virtual int calc_result_type2(
+      ObExprResType& type, ObExprResType& date, ObExprResType& format, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result2(
+      common::ObObj& result, const common::ObObj& date, const common::ObObj& format, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int calc_date_format(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+  static int calc_date_format_invalid(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprDateFormat);
+
+  static int set_cur_date(const common::ObTimeZoneInfo* tz_info, common::ObTime& ob_time);
+  static const int64_t OB_MAX_DATE_FORMAT_BUF_LEN = 1024;
+  static void check_reset_status(common::ObExprCtx& expr_ctx, int& ret, common::ObObj& result);
+};
+
+inline int ObExprDateFormat::calc_result_type2(
+    ObExprResType& type, ObExprResType& date, ObExprResType& format, common::ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  UNUSED(date);
+  UNUSED(format);
+  int ret = common::OB_SUCCESS;
+  //  common::ObCollationType collation_connection = common::CS_TYPE_INVALID;
+  type.set_varchar();
+  type.set_collation_type(type_ctx.get_coll_type());
+  type.set_collation_level(common::CS_LEVEL_COERCIBLE);
+  type.set_length(DATETIME_MAX_LENGTH);
+
+  const ObSQLSessionInfo* session = type_ctx.get_session();
+  if (OB_ISNULL(session)) {
+    ret = OB_ERR_UNEXPECTED;
+  } else if (session->use_static_typing_engine()) {
+    date.set_calc_collation_type(type.get_collation_type());
+    format.set_calc_collation_type(type.get_collation_type());
+  }
+
+  if (OB_SUCC(ret)) {
+    // for enum or set obj, we need calc type
+    if (ob_is_enum_or_set_type(date.get_type())) {
+      date.set_calc_type(common::ObVarcharType);
+    }
+    if (ob_is_enum_or_set_type(format.get_type())) {
+      format.set_calc_type(common::ObVarcharType);
+    }
+    if (ob_is_double_tc(date.get_type()) || ob_is_float_tc(date.get_type()) || ob_is_number_tc(date.get_type())) {
+      date.set_calc_type(common::ObVarcharType);
+    }
+  }
+
+  return ret;
+}
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif  // OCEANBASE_SQL_OB_EXPR_DATE_FORMAT_H_