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Copy pathob_expr_assign.cpp
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139 lines (128 loc) · 4.6 KB
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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.
*/
#define USING_LOG_PREFIX SQL_ENG
#include "sql/engine/expr/ob_expr_assign.h"
#include "lib/ob_name_def.h"
#include "share/object/ob_obj_cast.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_exec_context.h"
namespace oceanbase
{
using namespace common;
namespace sql
{
ObExprAssign::ObExprAssign(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_OP_ASSIGN, N_ASSIGN, 2, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
{
}
ObExprAssign::~ObExprAssign()
{
}
int ObExprAssign::calc_result_type2(ObExprResType &type,
ObExprResType &key,
ObExprResType &value,
common::ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
UNUSED(type_ctx);
UNUSED(key);
ObObjType val_type = value.get_type();
if (ob_is_temporal_type(val_type)){
type.set_varchar();
type.set_collation_level(common::CS_LEVEL_IMPLICIT);
type.set_collation_type(common::ObCharset::get_default_collation(common::ObCharset::get_default_charset()));
} else if (ob_is_bit_tc(val_type)) {
type.set_uint64();
value.set_calc_type(ObUInt64Type);
} else if (OB_UNLIKELY(value.is_null())) {
type.set_varchar();
type.set_collation_level(common::CS_LEVEL_IMPLICIT);
type.set_collation_type(common::CS_TYPE_BINARY);
} else {
type.set_type(val_type);
type.set_collation_level(common::CS_LEVEL_IMPLICIT);
type.set_collation_type(value.get_collation_type());
}
type.set_precision(value.get_precision());
type.set_scale(value.get_scale());
//set length
if (ob_is_string_type(type.get_type())) {
type.set_full_length(value.get_length(), value.get_length_semantics());
}
value.set_calc_meta(type.get_obj_meta());
value.set_calc_accuracy(type.get_accuracy());
value.set_calc_collation_type(type.get_collation_type());
value.set_calc_collation_level(type.get_collation_level());
key.set_calc_type(ObVarcharType);
key.set_calc_collation_type(ObCharset::get_system_collation());
return ret;
}
int calc_assign_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
{
int ret = OB_SUCCESS;
ObDatum *key_res = NULL;
ObDatum *val_res = NULL;
ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_session();
if (OB_ISNULL(session)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is NULL", K(ret));
} else if (OB_FAIL(expr.args_[0]->eval(ctx, key_res)) ||
OB_FAIL(expr.args_[1]->eval(ctx, val_res))) {
LOG_WARN("eval arg failed", K(ret));
} else {
ObObj obj;
ObObjMeta obj_meta;
ObSessionVariable sess_var;
if (val_res->is_null()) {
obj.set_null();
obj_meta.set_null();
// same as old engine. but why...
obj_meta.set_collation_level(CS_LEVEL_IMPLICIT);
obj_meta.set_collation_type(ObCharset::get_default_collation(
ObCharset::get_default_charset()));
} else {
obj_meta.set_type(expr.datum_meta_.type_);
obj_meta.set_scale(expr.datum_meta_.scale_);
obj_meta.set_collation_type(expr.datum_meta_.cs_type_);
obj_meta.set_collation_level(common::CS_LEVEL_IMPLICIT);
if (expr.args_[1]->obj_meta_.has_lob_header()) {
// use temp meta to session var，ensure flag in expr.args_[1](val_res) copy to dest
obj_meta.set_has_lob_header();
}
if (OB_FAIL(val_res->to_obj(obj, obj_meta))) {
LOG_WARN("to_obj failed", K(ret), K(expr), K(obj_meta));
}
}
if (OB_SUCC(ret)) {
sess_var.value_ = obj;
sess_var.meta_ = obj_meta;
}
if (OB_SUCC(ret) && OB_FAIL(session->replace_user_variable(
key_res->get_string(), sess_var))) {
LOG_WARN("replace user val failed", K(ret), K(key_res->get_string()));
} else {
res_datum.set_datum(*val_res);
}
}
return ret;
}
int ObExprAssign::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
ObExpr &rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
rt_expr.eval_func_ = calc_assign_expr;
return ret;
}
} //namespace sql
} //namespace oceanbase