115 lines
3.8 KiB
C++
115 lines
3.8 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 <string.h>
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#include "sql/engine/expr/ob_expr_to_clob.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "objit/common/ob_item_type.h"
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#include "lib/oblog/ob_log.h"
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#include "sql/engine/expr/ob_expr_lob_utils.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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ObExprToClob::ObExprToClob(ObIAllocator &alloc)
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: ObExprToCharCommon(alloc, T_FUN_SYS_TO_CLOB, N_TO_CLOB, 1)
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{
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}
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ObExprToClob::~ObExprToClob()
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{
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}
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int ObExprToClob::calc_result_type1(ObExprResType &type,
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ObExprResType &text,
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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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ObSessionNLSParams nls_param = type_ctx.get_session()->get_session_nls_params();
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if (OB_ISNULL(type_ctx.get_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_is_null(text.get_type())) {
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type.set_null();
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} else if (ob_is_string_tc(text.get_type())
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|| ob_is_clob(text.get_type(), text.get_collation_type())
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|| ob_is_raw(text.get_type())
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|| ob_is_numeric_type(text.get_type())
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|| ob_is_oracle_datetime_tc(text.get_type())
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|| ob_is_rowid_tc(text.get_type())
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|| ob_is_interval_tc(text.get_type())) {
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type.set_clob();
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type.set_collation_level(CS_LEVEL_IMPLICIT);
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type.set_collation_type(nls_param.nls_collation_);
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if (!text.is_clob()) {
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text.set_calc_type(ObVarcharType);
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}
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text.set_calc_collation_type(nls_param.nls_collation_);
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_WARN("wrong type of argument in function to_clob", K(ret), K(text));
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}
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return ret;
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}
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int ObExprToClob::calc_to_clob_expr(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res)
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{
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int ret = OB_SUCCESS;
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ObDatum *arg = NULL;
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ObObjType input_type = expr.args_[0]->datum_meta_.type_;
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ObCollationType cs_type = expr.args_[0]->datum_meta_.cs_type_;
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if (OB_UNLIKELY(1 != expr.arg_cnt_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg cnt or arg res type", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
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LOG_WARN("eval param failed", K(ret));
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} else if (arg->is_null()) {
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res.set_null();
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} else if (ob_is_clob(input_type, cs_type)) {
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res.set_datum(*arg);
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} else {
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ObString raw_string = arg->get_string();
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ObTextStringDatumResult str_result(expr.datum_meta_.type_, &expr, &ctx, &res);
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if (OB_FAIL(str_result.init(raw_string.length()))) {
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LOG_WARN("init lob result failed");
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} else if (OB_FAIL(str_result.append(raw_string.ptr(), raw_string.length()))) {
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LOG_WARN("append lob result failed");
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} else {
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str_result.set_result();
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}
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}
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if (OB_SUCC(ret) && !res.is_null() && res.len_ > OB_MAX_LONGTEXT_LENGTH) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("wrong length of result in function to_clob", K(ret), K(res.len_));
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}
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return ret;
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}
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int ObExprToClob::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_to_clob_expr;
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return ret;
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}
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} // end of sql
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} // end of oceanbase
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