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oceanbase-admin
181
src/sql/engine/expr/ob_expr_to_clob.cpp
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181
src/sql/engine/expr/ob_expr_to_clob.cpp
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/**
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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 "sql/parser/ob_item_type.h"
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#include "lib/oblog/ob_log.h"
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namespace oceanbase {
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using namespace common;
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namespace sql {
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ObExprToClob::ObExprToClob(ObIAllocator& alloc) : ObExprToCharCommon(alloc, T_FUN_SYS_TO_CLOB, N_TO_CLOB, 1)
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{}
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ObExprToClob::~ObExprToClob()
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{}
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int ObExprToClob::calc_result_type1(ObExprResType& type, ObExprResType& text, 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()) || ob_is_clob(text.get_type(), text.get_collation_type()) ||
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ob_is_raw(text.get_type()) || ob_is_numeric_type(text.get_type()) ||
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ob_is_oracle_datetime_tc(text.get_type()) || ob_is_rowid_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 (type_ctx.get_session()->use_static_typing_engine()) {
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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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if (ob_is_string_tc(text.get_type()) || ob_is_rowid_tc(text.get_type())) {
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text.set_calc_type(common::ObVarcharType);
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text.set_calc_collation_type(nls_param.nls_collation_);
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} else if (ob_is_clob(text.get_type(), text.get_collation_type())) {
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text.set_calc_collation_type(nls_param.nls_collation_);
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}
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}
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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_result1(common::ObObj& result, const ObObj& text, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(expr_ctx.calc_buf_)) {
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ret = OB_NOT_INIT;
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;
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LOG_WARN("varchar buffer not init", K(ret));
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;
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} else if (text.is_null_oracle()) {
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result.set_null();
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} else {
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ObString str;
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switch (text.get_type_class()) {
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case ObRawTC: {
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EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
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if (OB_ISNULL(cast_ctx.allocator_v2_)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("allocator in cast ctx is NULL", K(ret), K(text));
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} else if (OB_FAIL(ObHexUtils::rawtohex(text, cast_ctx, result))) {
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LOG_WARN("fail to calc", K(ret), K(text));
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} else {
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if (ObCharset::is_cs_nonascii(result_type_.get_collation_type())) {
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OZ(convert_result_collation(result_type_, result, expr_ctx.calc_buf_));
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}
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str = result.get_string();
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}
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break;
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}
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case ObIntTC:
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case ObUIntTC:
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case ObFloatTC:
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case ObDoubleTC:
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case ObNumberTC: {
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if (OB_FAIL(number_to_char(result, &text, 1, expr_ctx))) {
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LOG_WARN("failed to convert number to char", K(ret));
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} else {
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str = result.get_string();
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}
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break;
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}
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case ObDateTimeTC:
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case ObOTimestampTC: {
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if (OB_FAIL(datetime_to_char(result, &text, 1, expr_ctx))) {
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LOG_WARN("failed to convert datetime to char", K(ret));
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} else {
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str = result.get_string();
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}
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break;
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}
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case ObStringTC: {
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str = text.get_string();
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break;
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}
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case ObTextTC: {
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if (CS_TYPE_BINARY == text.get_collation_type()) {
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ret = OB_ERR_UNEXPECTED; // won't come here
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LOG_WARN("wrong type of argument in function to_clob", K(ret));
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} else {
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str = text.get_string();
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}
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break;
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}
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default: {
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ret = OB_ERR_UNEXPECTED; // won't come here
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LOG_WARN("wrong type of argument in function to_clob", K(ret), K(text.get_type()));
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break;
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}
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}
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if (OB_SUCC(ret)) {
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if (str.length() < 0 || str.length() > common::OB_MAX_LONGTEXT_LENGTH) {
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ret = OB_ERR_UNEXPECTED; // won't come here
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LOG_WARN("wrong length of result in function to_clob", K(ret));
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} else {
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result.set_lob_value(ObLongTextType, str.ptr(), str.length());
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result.set_collation_type(expr_ctx.my_session_->get_nls_collation());
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LOG_DEBUG("succ to calc", K(text), K(result));
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}
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}
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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, 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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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 {
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res.set_datum(*arg);
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if (!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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}
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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, 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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} // namespace sql
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} // namespace oceanbase
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