75 lines
2.5 KiB
C++
75 lines
2.5 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_RESV
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#include "sql/resolver/expr/ob_expr_relation_analyzer.h"
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#include "lib/oblog/ob_log_module.h"
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#include "sql/resolver/dml/ob_select_stmt.h"
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#include "common/ob_smart_call.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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ObExprRelationAnalyzer::ObExprRelationAnalyzer()
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{
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}
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/**
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* @brief ObExprRelationAnalyzer::pull_expr_relation_id_and_levels
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* ObColumnRefRawExpr:
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* relation ids: the bit index of the table item that the column belongs to
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* Other Exprs:
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* relation ids: the union of all param columns exprs' relation ids
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* @return
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*/
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int ObExprRelationAnalyzer::pull_expr_relation_id(ObRawExpr *expr)
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(expr)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("expr is null", K(ret), K(expr));
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} else if (OB_FAIL(visit_expr(*expr))) {
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LOG_WARN("failed to pull expr relation id and levels", K(ret));
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}
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return ret;
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}
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int ObExprRelationAnalyzer::visit_expr(ObRawExpr &expr)
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{
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int ret = OB_SUCCESS;
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int64_t param_count = expr.has_flag(IS_ONETIME) ? 1 : expr.get_param_count();
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if (!expr.is_column_ref_expr() &&
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T_PSEUDO_EXTERNAL_FILE_COL != expr.get_expr_type() &&
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T_ORA_ROWSCN != expr.get_expr_type()) {
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expr.get_relation_ids().reuse();
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}
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// not sure whether we should visit onetime exec param
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for (int64_t i = 0; OB_SUCC(ret) && i < param_count; ++i) {
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ObRawExpr *param = expr.has_flag(IS_ONETIME) ?
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static_cast<ObExecParamRawExpr &>(expr).get_ref_expr() :
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expr.get_param_expr(i);
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if (OB_ISNULL(param)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("param expr is null", K(ret), K(param), K(i), K(expr));
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} else if (OB_FAIL(SMART_CALL(visit_expr(*param)))) {
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LOG_WARN("failed to visit param", K(ret));
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} else if (OB_FAIL(expr.get_relation_ids().add_members(param->get_relation_ids()))) {
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LOG_WARN("failed to add relation ids", K(ret));
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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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