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oceanbase/src/sql/resolver/dml/ob_delete_resolver.cpp
wangzelin.wzl 93a1074b0c patch 4.0
2022-10-24 17:57:12 +08:00

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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/dml/ob_delete_resolver.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/resolver/ob_resolver_utils.h"
#include "sql/optimizer/ob_optimizer_util.h"
/**
* DELETE syntax from MySQL 5.7
*
* Single-Table Syntax:
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name
* [PARTITION (partition_name,...)]
* [WHERE where_condition]
* [ORDER BY ...]
* [LIMIT row_count]
*
* Multiple-Table Syntax
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE]
* tbl_name[.*] [, tbl_name[.*]] ...
* FROM table_references
* [WHERE where_condition]
* Or:
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE]
* FROM tbl_name[.*] [, tbl_name[.*]] ...
* USING table_references
* [WHERE where_condition]
*/
namespace oceanbase
{
using namespace common;
using namespace share;
using namespace share::schema;
namespace sql
{
ObDeleteResolver::ObDeleteResolver(ObResolverParams &params)
: ObDelUpdResolver(params)
{
params.contain_dml_ = true;
}
ObDeleteResolver::~ObDeleteResolver()
{
}
int ObDeleteResolver::resolve(const ParseNode &parse_tree)
{
int ret = OB_SUCCESS;
// create the delete stmt
ObDeleteStmt *delete_stmt = NULL;
bool is_multi_table_delete = false;
if (NULL == (delete_stmt = create_stmt<ObDeleteStmt>())) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_ERROR("create delete stmt failed", K(ret));
} else if (OB_UNLIKELY(parse_tree.type_ != T_DELETE) || OB_UNLIKELY(parse_tree.num_child_ < 2)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("parse tree type is invalid", K_(parse_tree.type), K_(parse_tree.num_child));
} else if (OB_ISNULL(parse_tree.children_[TABLE])) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("table_node is null", K(ret));
} else {
stmt_ = delete_stmt;
if (OB_FAIL(resolve_outline_data_hints())) {
LOG_WARN("resolve outline data hints failed", K(ret));
} else if (OB_FAIL(resolve_table_list(*parse_tree.children_[TABLE], is_multi_table_delete))) {
LOG_WARN("resolve table failed", K(ret));
} else {
for (int64_t i = 0; OB_SUCC(ret) && i < delete_tables_.count(); ++i) {
const TableItem *table_item = delete_tables_.at(i);
if (OB_ISNULL(table_item)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(ret));
} else if (OB_FAIL(generate_delete_table_info(*table_item))) {
LOG_WARN("failed to generate delete table info", K(ret));
} else if (is_oracle_mode() && !delete_stmt->has_instead_of_trigger()) {
// resolve check constraint for disable and validate check
ObSEArray<ObRawExpr*, 4> ck_exprs;
if (OB_FAIL(resolve_check_constraints(table_item, ck_exprs))) {
LOG_WARN("resolve check constraint failed", K(ret));
}
} else { /*do nothing*/ }
}
}
if (OB_SUCC(ret)) {
if (OB_FAIL(check_multi_delete_table_conflict())) {
LOG_WARN("failed to check multi-delete table conflict", K(ret));
}
}
if (OB_SUCC(ret)) {
if (OB_FAIL(resolve_where_clause(parse_tree.children_[WHERE]))) {
LOG_WARN("resolve delete where clause failed", K(ret));
} else if (OB_FAIL(resolve_order_clause(parse_tree.children_[ORDER_BY]))) {
LOG_WARN("resolve delete order clause failed", K(ret));
} else if (OB_FAIL(resolve_limit_clause(parse_tree.children_[LIMIT]))) {
LOG_WARN("resolve delete limit clause failed", K(ret));
} else if (OB_FAIL(resolve_hints(parse_tree.children_[HINT]))) {
LOG_WARN("resolve hints failed", K(ret));
} else if (OB_FAIL(resolve_returning(parse_tree.children_[RETURNING]))) {
LOG_WARN("resolve returning failed", K(ret));
} else if (is_oracle_mode() && NULL != parse_tree.children_[ERRORLOGGING] &&
OB_FAIL(resolve_error_logging(parse_tree.children_[ERRORLOGGING]))) {
LOG_WARN("failed to resolve error logging", K(ret));
} else if (OB_FAIL(delete_stmt->formalize_stmt(session_info_))) {
LOG_WARN("pull stmt all expr relation ids failed", K(ret));
} else { /*do nothing*/ }
}
if (OB_SUCC(ret)) {
if (!delete_stmt->has_instead_of_trigger() && OB_FAIL(view_pullup_part_exprs())) {
// instead of trigger的delete语句不需要 pull up
LOG_WARN("view pull up part exprs failed", K(ret));
} else if (OB_FAIL(check_view_deletable())) {
LOG_WARN("failed to check view deletable", K(ret));
} else if (OB_FAIL(delete_stmt->check_dml_need_filter_null())) {
LOG_WARN("failed to check dml need filter null", K(ret));
} else if (OB_FAIL(check_safe_update_mode(delete_stmt, is_multi_table_delete))) {
LOG_WARN("failed to check safe update mode", K(ret));
} else { /*do nothing */ }
}
}
return ret;
}
int ObDeleteResolver::check_safe_update_mode(ObDeleteStmt *delete_stmt, bool is_multi_table_delete)
{
int ret = OB_SUCCESS;
bool is_sql_safe_updates = false;
if (OB_ISNULL(params_.session_info_) || OB_ISNULL(delete_stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected", K(ret), K(params_.session_info_), K(delete_stmt));
} else if (OB_FAIL(params_.session_info_->get_sql_safe_updates(is_sql_safe_updates))) {
LOG_WARN("failed to get is safe update mode", K(ret));
} else if (is_sql_safe_updates) {
/*mysql安全模式下更新表值，需要满足：
* 前提条件：单表删除，不能是多表删除，必须含有where条件；
* 下面条件二者至少满足其中一个：
* 1.含有limit，where条件中有相关列存在；
* 2.有where条件中能够抽取query range ==> 由于抽取query range只能在optimizer阶段才能够抽取，因此该条件在
* optimizer阶段去检查
*/
if (is_multi_table_delete || delete_stmt->get_condition_exprs().empty()) {//前提条件
ret = OB_ERR_SAFE_UPDATE_MODE_NEED_WHERE_OR_LIMIT;
LOG_WARN("using safe update mode need WHERE or LIMIT", K(ret));
} else if (delete_stmt->has_limit()) {//条件1
bool is_const_expr = true;
for (int64_t i = 0;
OB_SUCC(ret) && is_const_expr && i < delete_stmt->get_condition_exprs().count();
++i) {
const ObRawExpr *expr = delete_stmt->get_condition_expr(i);
if (OB_ISNULL(expr)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(expr));
} else {
is_const_expr = expr->is_const_expr();
}
}
if (OB_SUCC(ret) && is_const_expr) {
ret = OB_ERR_SAFE_UPDATE_MODE_NEED_WHERE_OR_LIMIT;
LOG_WARN("using safe update mode need WHERE or LIMIT", K(ret));
}
}
} else {/*do nothing*/}
return ret;
}
int ObDeleteResolver::check_multi_delete_table_conflict()
{
int ret = OB_SUCCESS;
const ObDeleteStmt *delete_stmt = get_delete_stmt();
if (OB_ISNULL(delete_stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(ret));
} else if (delete_stmt->get_delete_table_info().count() <= 1) {
/*do nothing*/
} else {
const ObIArray<ObDeleteTableInfo*> &tables_info = delete_stmt->get_delete_table_info();
for (int64_t i = 0; OB_SUCC(ret) && i < tables_info.count() - 1; ++i) {
if (OB_ISNULL(tables_info.at(i))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(ret));
} else {
for (int64_t j = i + 1; OB_SUCC(ret) && j < tables_info.count(); ++j) {
if (OB_ISNULL(tables_info.at(j))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(ret));
} else if (tables_info.at(i)->ref_table_id_ == tables_info.at(j)->ref_table_id_) {
ret = OB_NOT_SUPPORTED;
LOG_USER_ERROR(OB_NOT_SUPPORTED, "multiple aliases to same table");
}
}
}
}
}
return ret;
}
int ObDeleteResolver::resolve_table_list(const ParseNode &table_list, bool &is_multi_table_delete)
{
int ret = OB_SUCCESS;
TableItem *table_item = NULL;
is_multi_table_delete = false;
const ParseNode *delete_list = NULL;
const ParseNode *from_list = NULL;
ObDeleteStmt *delete_stmt = get_delete_stmt();
CK(T_DELETE_TABLE_NODE == table_list.type_);
CK(2 == table_list.num_child_);
CK(OB_NOT_NULL(delete_stmt));
if (OB_SUCC(ret)) {
delete_list = table_list.children_[0];
from_list = table_list.children_[1];
}
CK(OB_NOT_NULL(from_list));
CK(T_TABLE_REFERENCES == from_list->type_);
CK(OB_NOT_NULL(from_list->children_));
for (int64_t i = 0; OB_SUCC(ret) && i < from_list->num_child_; ++i) {
const ParseNode *table_node = from_list->children_[i];
CK(OB_NOT_NULL(table_node));
if (OB_SUCC(ret)) {
if (OB_FAIL(ObDMLResolver::resolve_table(*table_node, table_item))) {
LOG_WARN("failed to resolve table", K(ret));
} else if (table_item->is_function_table()) {//兼容oracle行为
ret = OB_WRONG_TABLE_NAME;
LOG_WARN("invalid table name", K(ret));
} else if (OB_FAIL(column_namespace_checker_.add_reference_table(table_item))) {
LOG_WARN("add reference table to namespace checker failed", K(ret));
} else if (OB_FAIL(delete_stmt->add_from_item(table_item->table_id_,
table_item->is_joined_table()))) {
LOG_WARN("failed to add from item", K(ret));
} else {
/*
In order to share the same logic with 'select' to generate access path costly, we
add the table in the udpate stmt in the from_item list as well.
*/
LOG_DEBUG("succ to add from item", KPC(table_item));
}
}
}
if (OB_SUCC(ret)) {
if (NULL == delete_list) {
bool has_tg = false;
//single table delete, delete list is same with from list
CK(delete_stmt->get_table_size() == 1);
OZ(delete_tables_.push_back(delete_stmt->get_table_item(0)));
if (OB_SUCC(ret) && delete_stmt->get_table_item(0)->is_view_table_ && is_oracle_mode()) {
OZ(has_need_fired_trigger_on_view(delete_stmt->get_table_item(0), has_tg));
}
OX(delete_stmt->set_has_instead_of_trigger(has_tg));
} else {
//multi table delete
is_multi_table_delete = true;
ObString table_name;
ObString db_name;
CK(T_TABLE_REFERENCES == delete_list->type_);
for (int64_t i = 0; OB_SUCC(ret) && i < delete_list->num_child_; ++i) {
table_name.reset();
db_name.reset();
table_item = NULL;
const ParseNode *table_node = delete_list->children_[i];
if (OB_FAIL(resolve_table_relation_node(table_node, table_name, db_name, true))) {
LOG_WARN("failed to resolve table relation node", K(ret));
} else if (OB_FAIL(find_delete_table_with_mysql_rule(db_name, table_name, table_item))) {
LOG_WARN("failed to find delete table with mysql rule", K(ret));
} else if (OB_ISNULL(table_item)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get null table item", K(ret));
} else if (OB_UNLIKELY(ObOptimizerUtil::find_item(delete_tables_, table_item))) {
ret = OB_ERR_NONUNIQ_TABLE;
LOG_USER_ERROR(OB_ERR_NONUNIQ_TABLE, table_item->table_name_.length(),
table_item->table_name_.ptr());
} else if (OB_FAIL(delete_tables_.push_back(table_item))) {
LOG_WARN("failed to push back table item", K(ret));
}
}
}
}
if (OB_SUCC(ret)) {
FOREACH_CNT_X(table_item, delete_tables_, OB_SUCC(ret)) {
if (NULL != *table_item && ((*table_item)->is_generated_table() || (*table_item)->is_temp_table())) {
if (!delete_stmt->has_instead_of_trigger()
&& OB_FAIL(set_base_table_for_view(**table_item))) {
LOG_WARN("set base table for delete view failed", K(ret));
} else if (OB_FAIL(add_all_column_to_updatable_view(*delete_stmt, **table_item,
delete_stmt->has_instead_of_trigger()))) {
LOG_WARN("add all column to updatable view failed", K(ret));
}
}
}
}
return ret;
}
int ObDeleteResolver::find_delete_table_with_mysql_rule(const ObString &db_name,
const ObString &table_name,
TableItem *&table_item)
{
int ret = OB_SUCCESS;
ObDMLStmt *stmt = get_stmt();
CK(OB_NOT_NULL(stmt));
CK(OB_NOT_NULL(session_info_));
ObString final_db_name;
table_item = NULL;
ObSEArray<const TableItem*, 2> table_items;
OZ(stmt->get_all_table_item_by_tname(session_info_, db_name, table_name, table_items));
if (OB_SUCC(ret)) {
if (table_items.count() == 1) {
table_item = const_cast<TableItem*>(table_items.at(0));
} else if (db_name.empty()) {
//如果table_items中有多个table_item，说明delete子句没有指定table的database_name
//而from子句中所有表都是基表，例如delete t1.* from db1.t1, db2.t1;
//这种情况下，我们认为delete子句中的database_name和session上的保持一致
ObString final_db_name = session_info_->get_database_name();
if (final_db_name.empty()) {
ret = OB_ERR_NO_DB_SELECTED;
LOG_WARN("no database selected");
}
for (int64_t i = 0; OB_SUCC(ret) && OB_ISNULL(table_item) && i < table_items.count(); ++i) {
if (ObCharset::case_insensitive_equal(final_db_name, table_items.at(i)->database_name_)
&& ObCharset::case_insensitive_equal(table_name, table_items.at(i)->table_name_)) {
table_item = const_cast<TableItem*>(table_items.at(i));
}
}
}
}
if (OB_SUCC(ret)) {
if (OB_ISNULL(table_item)) {
ret = OB_ERR_UNKNOWN_TABLE;
ObString print_table_name = concat_table_name(db_name, table_name);
ObString scope_name = ObString::make_string("MULTI DELETE");
LOG_USER_ERROR(OB_ERR_UNKNOWN_TABLE, print_table_name.length(), print_table_name.ptr(),
scope_name.length(), scope_name.ptr());
} else if (!table_item->is_basic_table() && !table_item->is_generated_table() && !table_item->is_temp_table()) {
ret = OB_ERR_NON_UPDATABLE_TABLE;
ObString print_table_name = concat_table_name(db_name, table_name);
ObString scope_name = ObString::make_string("DELETE");
LOG_USER_ERROR(OB_ERR_NON_UPDATABLE_TABLE, print_table_name.length(), print_table_name.ptr(),
scope_name.length(), scope_name.ptr());
}
}
return ret;
}
int ObDeleteResolver::generate_delete_table_info(const TableItem &table_item)
{
int ret = OB_SUCCESS;
const TableItem &base_table_item = table_item.get_base_table_item();
void *ptr = NULL;
const ObTableSchema *table_schema = NULL;
ObDeleteStmt *delete_stmt = get_delete_stmt();
ObDeleteTableInfo *table_info = NULL;
uint64_t index_tid[OB_MAX_INDEX_PER_TABLE];
int64_t gindex_cnt = OB_MAX_INDEX_PER_TABLE;
int64_t binlog_row_image = ObBinlogRowImage::FULL;
if (OB_ISNULL(schema_checker_) || OB_ISNULL(params_.session_info_) ||
OB_ISNULL(allocator_) || OB_ISNULL(delete_stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(schema_checker_), K(params_.session_info_),
K(allocator_), K(delete_stmt), K(ret));
} else if (OB_FAIL(schema_checker_->get_table_schema(params_.session_info_->get_effective_tenant_id(),
base_table_item.ref_id_,
table_schema,
base_table_item.is_link_table()))) {
LOG_WARN("failed to get table schema", K(ret));
} else if (OB_ISNULL(table_schema)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(ret));
} else if (OB_FAIL(schema_checker_->get_can_write_index_array(params_.session_info_->get_effective_tenant_id(),
base_table_item.ref_id_,
index_tid, gindex_cnt, true))) {
LOG_WARN("failed to get global index", K(ret));
} else if (OB_FAIL(params_.session_info_->get_binlog_row_image(binlog_row_image))) {
LOG_WARN("fail to get binlog row image", K(ret));
} else if (NULL == (ptr = allocator_->alloc(sizeof(ObDeleteTableInfo)))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("failed to allocate table info", K(ret));
} else {
table_info = new(ptr) ObDeleteTableInfo();
if (OB_FAIL(table_info->part_ids_.assign(base_table_item.part_ids_))) {
LOG_WARN("failed to assign part ids", K(ret));
} else if (!delete_stmt->has_instead_of_trigger()) {
// todo @zimiao error logging also need all columns ?
if (OB_FAIL(add_all_rowkey_columns_to_stmt(table_item, table_info->column_exprs_))) {
LOG_WARN("add all rowkey columns to stmt failed", K(ret));
} else if (need_all_columns(*table_schema, binlog_row_image)) {
if (OB_FAIL(add_all_columns_to_stmt(table_item, table_info->column_exprs_))) {
LOG_WARN("fail to add all column to stmt", K(ret), K(table_item));
}
} else if (OB_FAIL(add_all_index_rowkey_to_stmt(table_item,
table_info->column_exprs_))) {
LOG_WARN("fail to add relate column to stmt", K(ret), K(table_item));
}
if (OB_SUCC(ret)) {
table_info->table_id_ = table_item.table_id_;
table_info->loc_table_id_ = base_table_item.table_id_;
table_info->ref_table_id_ = base_table_item.ref_id_;
table_info->table_name_ = table_schema->get_table_name_str();
}
} else {
uint64_t view_id = OB_INVALID_ID;
if (OB_FAIL(add_all_columns_to_stmt_for_trigger(table_item, table_info->column_exprs_))) {
LOG_WARN("failed to add all columns to stmt", K(ret));
} else if (OB_FAIL(get_view_id_for_trigger(table_item, view_id))) {
LOG_WARN("get view id failed", K(table_item), K(ret));
} else {
table_info->table_id_ = table_item.table_id_;
table_info->loc_table_id_ = table_item.table_id_;
table_info->ref_table_id_ = view_id;
table_info->table_name_ = table_item.table_name_;
}
}
if (OB_SUCC(ret)) {
if (OB_FAIL(delete_stmt->get_delete_table_info().push_back(table_info))) {
LOG_WARN("failed to push back table info", K(ret));
} else if (gindex_cnt > 0) {
delete_stmt->set_has_global_index(true);
} else { /*do nothing*/ }
}
}
return ret;
}
int ObDeleteResolver::check_view_deletable()
{
int ret = OB_SUCCESS;
// uv_check_basic && mysql join already checked in set_base_table_for_view()
FOREACH_CNT_X(it, delete_tables_, OB_SUCC(ret)) {
const TableItem *table = *it;
if (OB_ISNULL(*it)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("NULL table table ", K(ret));
} else if (!table->is_generated_table() && !table->is_temp_table()) {
continue;
} else if (OB_ISNULL(table->ref_query_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("ref query is NULL for generate table", K(ret));
}
if (OB_SUCC(ret) && is_mysql_mode()) {
if (OB_SUCC(ret)) {
bool has_subquery = false;
bool has_dependent_subquery = false;
bool ref_update_table = false;
if (OB_FAIL(ObResolverUtils::uv_check_select_item_subquery(
*table, has_subquery, has_dependent_subquery, ref_update_table))) {
LOG_WARN("updatable view check select table failed", K(ret));
} else {
LOG_DEBUG("update view check",
K(has_subquery), K(has_dependent_subquery), K(ref_update_table));
ret = (has_dependent_subquery || ref_update_table) ? OB_ERR_NON_UPDATABLE_TABLE : OB_SUCCESS;
}
}
if (OB_ERR_NON_UPDATABLE_TABLE == ret) {
ObString str = "DELETE";
LOG_USER_ERROR(OB_ERR_NON_UPDATABLE_TABLE,
table->get_table_name().length(), table->get_table_name().ptr(),
str.length(), str.ptr());
}
}
if (OB_SUCC(ret) && lib::is_oracle_mode() && !get_delete_stmt()->has_instead_of_trigger()) {
if (OB_SUCC(ret)) {
bool has_distinct = false;
if (OB_FAIL(ObResolverUtils::uv_check_oracle_distinct(
*table, *session_info_, *schema_checker_, has_distinct))) {
LOG_WARN("check updatable view distinct failed", K(ret));
} else {
LOG_DEBUG("check has distinct", K(ret), K(has_distinct));
ret = has_distinct ? OB_ERR_ILLEGAL_VIEW_UPDATE : ret;
}
}
if (OB_SUCC(ret)) {
// check key preserved table
bool key_preserved = 0;
if (OB_FAIL(uv_check_key_preserved(*table, key_preserved))) {
LOG_WARN("check key preserved failed", K(ret));
} else {
LOG_DEBUG("check key preserved", K(key_preserved));
ret = !key_preserved ? OB_ERR_O_DELETE_VIEW_NON_KEY_PRESERVED: ret;
}
}
}
}
return ret;
}
} // namespace sql
}
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