140 lines
4.6 KiB
C++
140 lines
4.6 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "sql/engine/expr/ob_expr_assign.h"
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#include "lib/ob_name_def.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/ob_exec_context.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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ObExprAssign::ObExprAssign(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_OP_ASSIGN, N_ASSIGN, 2, NOT_ROW_DIMENSION)
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{
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}
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ObExprAssign::~ObExprAssign()
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{
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}
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int ObExprAssign::calc_result_type2(ObExprResType &type,
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ObExprResType &key,
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ObExprResType &value,
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common::ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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UNUSED(type_ctx);
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UNUSED(key);
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ObObjType val_type = value.get_type();
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if (ob_is_temporal_type(val_type)){
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type.set_varchar();
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type.set_collation_level(common::CS_LEVEL_IMPLICIT);
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type.set_collation_type(common::ObCharset::get_default_collation(common::ObCharset::get_default_charset()));
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} else if (ob_is_bit_tc(val_type)) {
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type.set_uint64();
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value.set_calc_type(ObUInt64Type);
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} else if (OB_UNLIKELY(value.is_null())) {
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type.set_varchar();
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type.set_collation_level(common::CS_LEVEL_IMPLICIT);
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type.set_collation_type(common::CS_TYPE_BINARY);
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} else {
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type.set_type(val_type);
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type.set_collation_level(common::CS_LEVEL_IMPLICIT);
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type.set_collation_type(value.get_collation_type());
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}
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type.set_precision(value.get_precision());
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type.set_scale(value.get_scale());
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//set length
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if (ob_is_string_type(type.get_type())) {
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type.set_full_length(value.get_length(), value.get_length_semantics());
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}
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value.set_calc_meta(type.get_obj_meta());
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value.set_calc_accuracy(type.get_accuracy());
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value.set_calc_collation_type(type.get_collation_type());
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value.set_calc_collation_level(type.get_collation_level());
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key.set_calc_type(ObVarcharType);
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key.set_calc_collation_type(ObCharset::get_system_collation());
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return ret;
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}
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int calc_assign_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *key_res = NULL;
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ObDatum *val_res = NULL;
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ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_session();
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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session is NULL", K(ret));
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} else if (OB_FAIL(expr.args_[0]->eval(ctx, key_res)) ||
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OB_FAIL(expr.args_[1]->eval(ctx, val_res))) {
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LOG_WARN("eval arg failed", K(ret));
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} else {
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ObObj obj;
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ObObjMeta obj_meta;
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ObSessionVariable sess_var;
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if (val_res->is_null()) {
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obj.set_null();
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obj_meta.set_null();
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// same as old engine. but why...
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obj_meta.set_collation_level(CS_LEVEL_IMPLICIT);
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obj_meta.set_collation_type(ObCharset::get_default_collation(
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ObCharset::get_default_charset()));
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} else {
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obj_meta.set_type(expr.datum_meta_.type_);
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obj_meta.set_scale(expr.datum_meta_.scale_);
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obj_meta.set_collation_type(expr.datum_meta_.cs_type_);
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obj_meta.set_collation_level(common::CS_LEVEL_IMPLICIT);
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if (expr.args_[1]->obj_meta_.has_lob_header()) {
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// use temp meta to session var，ensure flag in expr.args_[1](val_res) copy to dest
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obj_meta.set_has_lob_header();
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}
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if (OB_FAIL(val_res->to_obj(obj, obj_meta))) {
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LOG_WARN("to_obj failed", K(ret), K(expr), K(obj_meta));
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}
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}
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if (OB_SUCC(ret)) {
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sess_var.value_ = obj;
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sess_var.meta_ = obj_meta;
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}
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if (OB_SUCC(ret) && OB_FAIL(session->replace_user_variable(
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key_res->get_string(), sess_var))) {
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LOG_WARN("replace user val failed", K(ret), K(key_res->get_string()));
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} else {
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res_datum.set_datum(*val_res);
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}
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}
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return ret;
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}
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int ObExprAssign::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = calc_assign_expr;
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return ret;
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}
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} //namespace sql
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} //namespace oceanbase
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