76 lines
2.3 KiB
C++
76 lines
2.3 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_EXE
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#include "ob_expr_from_days.h"
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#include "sql/session/ob_sql_session_info.h"
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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprFromDays::ObExprFromDays(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_FROM_DAYS, N_FROM_DAYS, 1, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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};
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ObExprFromDays::~ObExprFromDays()
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{
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}
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int ObExprFromDays::cg_expr(ObExprCGCtx &op_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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UNUSED(op_cg_ctx);
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UNUSED(raw_expr);
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int ret = OB_SUCCESS;
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if (rt_expr.arg_cnt_ != 1) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("fromdays expr should have one param", K(ret), K(rt_expr.arg_cnt_));
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} else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0])) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("children of fromdays expr is null", K(ret), K(rt_expr.args_));
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} else {
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CK(ObInt32Type == rt_expr.args_[0]->datum_meta_.type_);
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rt_expr.eval_func_ = ObExprFromDays::calc_fromdays;
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}
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return ret;
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}
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int ObExprFromDays::calc_fromdays(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 *param_datum = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum))) {
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LOG_WARN("eval param value failed", K(ret));
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} else if (OB_UNLIKELY(param_datum->is_null())) {
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expr_datum.set_null();
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} else {
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// max: 9999-12-31 min:0000-00-00
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int32_t value = param_datum->get_int32();
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if (value >= MIN_DAYS_OF_DATE
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&& value <= MAX_DAYS_OF_DATE) {
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expr_datum.set_date(value - DAYS_FROM_ZERO_TO_BASE);
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} else {
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expr_datum.set_date(ObTimeConverter::ZERO_DATE);
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}
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}
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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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