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src/sql/engine/expr/ob_expr_get_user_var.cpp Normal file
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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_get_user_var.h"
#include "sql/engine/expr/ob_expr_util.h"
#include "sql/engine/expr/ob_datum_cast.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 {
ObExprGetUserVar::ObExprGetUserVar(ObIAllocator& alloc)
: ObFuncExprOperator(alloc, T_OP_GET_USER_VAR, N_GET_USER_VAR, 1, NOT_ROW_DIMENSION)
{}
ObExprGetUserVar::~ObExprGetUserVar()
{}
int ObExprGetUserVar::calc_result1(ObObj& result, const ObObj& key, ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (OB_UNLIKELY(ObStringTC != key.get_type_class())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("Key must be string type", K(ret), K(key));
} else if (OB_ISNULL(expr_ctx.my_session_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("Session info null pointer", K(ret), K(expr_ctx.my_session_));
} else {
ObString str = key.get_varchar();
ObSessionVariable osv;
ret = expr_ctx.my_session_->get_user_variable(str, osv);
if (OB_SUCC(ret)) {
result = osv.value_;
result.set_meta_type(osv.meta_);
} else if (OB_ERR_USER_VARIABLE_UNKNOWN == ret) {
result.set_null();
result.set_collation_level(CS_LEVEL_IMPLICIT);
ret = OB_SUCCESS; // always return success no matter found or not
} else {
LOG_WARN("Unexpected ret code", K(ret), K(str), K(osv));
}
}
return ret;
}
int ObExprGetUserVar::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
{
UNUSED(type_ctx);
int ret = OB_SUCCESS;
const ObObj& obj = type1.get_param();
ObString key = obj.get_varchar(); // should NOT use const reference here !
ObSessionVariable session_var;
CK(OB_NOT_NULL(type_ctx.get_session()));
OC((type_ctx.get_session()->get_user_variable)(key, session_var));
if (OB_SUCC(ret)) {
if (session_var.value_.is_null()) {
type.set_varchar(); // blob in mysql. use varchar instead in ob.
type.set_collation_level(CS_LEVEL_IMPLICIT);
type.set_collation_type(CS_TYPE_BINARY);
} else {
type.set_type(session_var.meta_.get_type());
type.set_scale(session_var.meta_.get_scale());
type.set_collation_level(session_var.meta_.get_collation_level());
type.set_collation_type(session_var.meta_.get_collation_type());
}
} else if (OB_ERR_USER_VARIABLE_UNKNOWN == ret) {
type.set_varchar(); // blob in mysql. use varchar instead in ob.
type.set_collation_level(CS_LEVEL_IMPLICIT);
type.set_collation_type(CS_TYPE_BINARY);
ret = OB_SUCCESS; // always return success no matter found or not
} else {
LOG_WARN("Unexpected ret code", K(ret), K(key), K(session_var));
}
if (OB_SUCC(ret) && ob_is_string_type(type.get_type())) {
// set length
int64_t mbmaxlen = 0;
if (OB_FAIL(ObCharset::get_mbmaxlen_by_coll(type.get_collation_type(), mbmaxlen))) {
ret = OB_ERR_UNEXPECTED;
SQL_RESV_LOG(WARN, "fail to get mbmaxlen", K(ret), K(type.get_collation_type()));
} else {
type.set_length(static_cast<ObLength>(OB_MAX_VARCHAR_LENGTH / mbmaxlen));
}
}
return ret;
}
int ObExprGetUserVar::eval_get_user_var(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
{
int ret = OB_SUCCESS;
ObDatum* key = NULL;
if (OB_FAIL(expr.eval_param_value(ctx, key))) {
LOG_WARN("eval arg failed", K(ret));
} else if (key->is_null()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("user var name is NULL", K(ret));
} else {
ObSQLSessionInfo* my_session = ctx.exec_ctx_.get_my_session();
CK(OB_NOT_NULL(my_session));
if (OB_SUCC(ret)) {
const ObString& key_str = key->get_string();
ObSessionVariable osv;
ret = my_session->get_user_variable(key_str, osv);
if (OB_SUCC(ret)) {
ObObj sess_obj = osv.value_;
sess_obj.set_meta_type(osv.meta_);
if (expr.datum_meta_.type_ != sess_obj.get_type() ||
(sess_obj.is_string_type() && expr.datum_meta_.cs_type_ != sess_obj.get_collation_type())) {
// eg: set @a = 10, @b = 1;
// select @a := '10', @b := '1', @a < @b;
// expr.datum_meta_ is type of the origin var(int),
// osv.value_ may be updated(string)
ObObj res_obj;
ObIAllocator& calc_alloc = ctx.get_reset_tmp_alloc();
OZ(ObDatumCast::cast_obj(
ctx, calc_alloc, expr.datum_meta_.type_, expr.datum_meta_.cs_type_, sess_obj, res_obj));
OZ(res.from_obj(res_obj));
// res.ptr_ may allocated by temporary allocator, need deep copy.
OZ(expr.deep_copy_datum(ctx, res));
} else {
OZ(res.from_obj(sess_obj));
}
} else if (OB_ERR_USER_VARIABLE_UNKNOWN == ret) {
res.set_null();
ret = OB_SUCCESS; // always return success no matter found or not
} else {
LOG_WARN("Unexpected ret code", K(ret), K(key_str), K(osv));
}
}
}
return ret;
}
int ObExprGetUserVar::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
CK(1 == expr.arg_cnt_);
CK(ObStringTC == ob_obj_type_class(expr.args_[0]->datum_meta_.type_));
OX(expr.eval_func_ = eval_get_user_var);
return ret;
}
} // namespace sql
} // namespace oceanbase