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oceanbase-admin
2021-05-31 22:56:52 +08:00
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src/sql/resolver/ddl/ob_explain_resolver.cpp Normal file
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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#define USING_LOG_PREFIX SQL_RESV
#include "sql/resolver/ddl/ob_explain_resolver.h"
#include "sql/resolver/ob_resolver.h"
using namespace oceanbase;
using namespace sql;
using namespace common;
#define EXPLAIN_FORMAT 0
#define EXPLAIN_CHILD_STMT 1
int ObExplainResolver::resolve(const ParseNode& parse_tree)
{
int ret = OB_SUCCESS;
ObExplainStmt* explain_stmt = NULL;
if (!(T_EXPLAIN == parse_tree.type_ && 2 == parse_tree.num_child_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid EXPLAIN syntax", "type", parse_tree.type_, "# of child", parse_tree.num_child_);
} else if (NULL == (explain_stmt = create_stmt<ObExplainStmt>())) {
ret = OB_SQL_RESOLVER_NO_MEMORY;
LOG_WARN("failed to create explain stmt");
} else {
ParseNode* child_node = parse_tree.children_[EXPLAIN_CHILD_STMT];
ObStmt* child_stmt = NULL;
if (OB_ISNULL(child_node)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("empty parse tree for stmt");
} else if (!(T_SELECT == child_node->type_ || T_DELETE == child_node->type_ || T_INSERT == child_node->type_ ||
T_MERGE == child_node->type_ || T_UPDATE == child_node->type_ || T_REPLACE == child_node->type_ ||
T_MULTI_INSERT == child_node->type_)) {
ret = OB_NOT_SUPPORTED;
LOG_WARN("invalid stmt type for EXPLAIN", "type", child_node->type_);
} else {
ObResolver resolver(params_);
if (OB_FAIL(resolver.resolve(ObResolver::IS_NOT_PREPARED_STMT, *child_node, child_stmt))) {
LOG_WARN("failed to resolve child stmt", K(ret));
} else if (OB_ISNULL(child_stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to generate stmt for child stmt");
} else {
explain_stmt->set_explain_query_stmt(static_cast<ObDMLStmt*>(child_stmt));
ParseNode* format = parse_tree.children_[EXPLAIN_FORMAT];
if (NULL != format) {
switch (format->type_) {
case T_OUTLINE: {
explain_stmt->set_explain_format(EXPLAIN_OUTLINE);
} break;
case T_EXTENDED: {
explain_stmt->set_explain_format(EXPLAIN_EXTENDED);
} break;
case T_PARTITIONS: {
explain_stmt->set_explain_format(EXPLAIN_PARTITIONS);
} break;
case T_TRADITIONAL: {
explain_stmt->set_explain_format(EXPLAIN_TRADITIONAL);
} break;
case T_JSON: {
explain_stmt->set_explain_format(EXPLAIN_JSON);
} break;
case T_BASIC: {
explain_stmt->set_explain_format(EXPLAIN_BASIC);
break;
}
case T_EXTENDED_NOADDR: {
explain_stmt->set_explain_format(EXPLAIN_EXTENDED_NOADDR);
break;
}
case T_PLANREGRESS: {
explain_stmt->set_explain_format(EXPLAIN_PLANREGRESS);
break;
}
default:
ret = OB_ERROR;
LOG_WARN("unknown explain format", "format", format->type_);
break;
}
}
}
}
}
return ret;
}