104 lines
3.4 KiB
C++
104 lines
3.4 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/compress/zlib/zlib_src/zlib.h"
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#include "lib/charset/ob_charset.h"
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#include "lib/ob_name_def.h"
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#include "lib/utility/ob_macro_utils.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/expr/ob_expr_crc32.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/expr/ob_expr_lob_utils.h"
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namespace oceanbase {
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using namespace common;
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namespace sql {
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ObExprCrc32::ObExprCrc32(ObIAllocator& alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_CRC32, N_CRC32, 1, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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int ObExprCrc32::calc_result_type1(ObExprResType& type, ObExprResType& type1, 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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type.set_precision(10);
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type.set_uint64();
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if (OB_LIKELY(type1.is_not_null_for_read())) {
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type.set_result_flag(NOT_NULL_FLAG);
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}
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if (ob_is_string_type(type1.get_type())) {
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type1.set_calc_type(type1.get_type());
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type1.set_calc_collation_type(type1.get_collation_type());
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} else {
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type1.set_calc_type(ObVarcharType);
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type1.set_calc_collation_type(ObCharset::get_system_collation());
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}
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return ret;
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}
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inline void calc_crc32_inner(const ObString &str_val, ObDatum &res_datum)
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{
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if (str_val.empty()) {
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res_datum.set_uint(0ULL);
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} else {
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unsigned char* buf = reinterpret_cast<unsigned char*>(const_cast<char*>(str_val.ptr()));
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res_datum.set_uint(crc32(0, buf, str_val.length()));
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}
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}
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int ObExprCrc32::calc_crc32_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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unsigned char* buf = NULL;
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ObDatum* s_datum = NULL;
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const ObDatumMeta &datum_meta = expr.args_[0]->datum_meta_;
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if (OB_FAIL(expr.args_[0]->eval(ctx, s_datum))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (s_datum->is_null()) {
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res_datum.set_null();
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} else if (!ob_is_text_tc(datum_meta.type_)) {
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const ObString& str_val = s_datum->get_string();
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calc_crc32_inner(str_val, res_datum);
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} else { // text tc
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ObString str_val;
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ObEvalCtx::TempAllocGuard tmp_alloc_g(ctx);
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common::ObArenaAllocator &temp_allocator = tmp_alloc_g.get_allocator();
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if (OB_FAIL(ObTextStringHelper::read_real_string_data(temp_allocator, *s_datum,
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datum_meta, expr.args_[0]->obj_meta_.has_lob_header(), str_val))) {
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LOG_WARN("get string data failed", K(ret));
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} else {
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calc_crc32_inner(str_val, res_datum);
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}
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}
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return ret;
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}
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int ObExprCrc32::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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CK(1 == rt_expr.arg_cnt_);
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CK(!OB_ISNULL(rt_expr.args_) && !OB_ISNULL(rt_expr.args_[0]));
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CK(ob_is_string_type(rt_expr.args_[0]->datum_meta_.type_));
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rt_expr.eval_func_ = calc_crc32_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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