77 lines
2.0 KiB
C++
77 lines
2.0 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 "sql/engine/expr/ob_expr_version.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/ob_exec_context.h"
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#include "share/system_variable/ob_sys_var_class_type.h"
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using namespace oceanbase::common;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprVersion::ObExprVersion(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_FUN_SYS_VERSION, N_VERSION, 0)
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{
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}
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ObExprVersion::~ObExprVersion()
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{
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}
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int ObExprVersion::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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type.set_varchar();
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type.set_length(static_cast<common::ObLength>(OB_MAX_SYS_VAR_VAL_LENGTH));
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type.set_default_collation_type();
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type.set_collation_level(CS_LEVEL_SYSCONST);
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return OB_SUCCESS;
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}
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int ObExprVersion::eval_version(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_session();
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if (OB_ISNULL(session)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("session is null", K(ret));
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} else {
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ObString version;
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if (OB_FAIL(session->get_sys_variable(share::SYS_VAR_VERSION, version))) {
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LOG_WARN("fail to get version", K(ret));
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} else {
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expr_datum.set_string(version);
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}
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}
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return ret;
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}
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int ObExprVersion::cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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UNUSED(raw_expr);
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UNUSED(op_cg_ctx);
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rt_expr.eval_func_ = ObExprVersion::eval_version;
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return OB_SUCCESS;
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}
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}/* ns sql*/
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}/* ns oceanbase */
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