106 lines
3.5 KiB
C++
106 lines
3.5 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 "lib/oblog/ob_log.h"
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#include "sql/engine/expr/ob_expr_rowid_to_nchar.h"
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#include "objit/common/ob_item_type.h"
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#include "sql/session/ob_sql_session_info.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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ObExprRowIDToNChar::ObExprRowIDToNChar(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_FUN_SYS_ROWID_TO_NCHAR, N_ROWID_TO_NCHAR, 1)
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{
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}
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ObExprRowIDToNChar::~ObExprRowIDToNChar()
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{
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}
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int ObExprRowIDToNChar::calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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const ObBasicSessionInfo *session = type_ctx.get_session();
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CK(OB_NOT_NULL(session));
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if (OB_SUCC(ret)) {
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type.set_nvarchar2();
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type.set_collation_type(session->get_nls_collation_nation());
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type.set_collation_level(CS_LEVEL_IMPLICIT);
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type.set_length_semantics(LS_CHAR);
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type.set_length(type1.get_length());
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type1.set_calc_type(ObURowIDType);
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}
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return ret;
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}
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int ObExprRowIDToNChar::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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CK(1 == rt_expr.arg_cnt_);
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rt_expr.eval_func_ = eval_rowid_to_nchar;
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return ret;
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}
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int ObExprRowIDToNChar::eval_rowid_to_nchar(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
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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_FAIL(expr.eval_param_value(ctx, arg))) {
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LOG_WARN("evaluate parameters failed", K(ret));
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} else if (arg->is_null()) {
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expr_datum.set_null();
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} else {
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ObURowIDData rowid_data = arg->get_urowid();
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char *buf = NULL;
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char *utf16_buf = NULL;
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const int32_t CharConvertFactorNum = 4; //最多使用4字节存储一个字符
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int64_t size = rowid_data.needed_base64_buffer_size();
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int64_t pos = 0;
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uint32_t res_len = 0;
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &alloc = alloc_guard.get_allocator();
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if (OB_ISNULL(buf = (char*)alloc.alloc(size))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("alloc mem failed", K(ret), K(size));
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} else if (OB_FAIL(rowid_data.get_base64_str(buf, size, pos))) {
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LOG_WARN("encode rowid obj failed", K(ret));
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} else if (OB_ISNULL(utf16_buf = (char*)(expr.get_str_res_mem(ctx, pos * CharConvertFactorNum)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("alloc mem failed", K(ret), K(pos * CharConvertFactorNum));
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} else if (OB_FAIL(ObCharset::charset_convert(CS_TYPE_UTF8MB4_GENERAL_CI,
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buf, pos, expr.datum_meta_.cs_type_,
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utf16_buf, pos * CharConvertFactorNum, res_len))) {
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LOG_WARN("charset convert failed", K(ret));
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} else {
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expr_datum.set_string(ObString(res_len, utf16_buf));
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LOG_DEBUG("calc rowid to nchar done", KPC(arg), K(expr_datum));
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}
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}
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return ret;
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}
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} /* sql */
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} /* oceanbase */
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