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/*
* Copyright (c) 2025 OceanBase.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define USING_LOG_PREFIX SQL_PC
#include "sql/plan_cache/ob_pcv_set.h"
using namespace oceanbase::common;
using namespace oceanbase::share::schema;
namespace oceanbase
{
namespace sql
{
int ObPCVSet::init(ObILibCacheCtx &ctx, const ObILibCacheObject *obj)
{
int ret = OB_SUCCESS;
ObSQLSessionInfo* sess;
ObPlanCacheCtx &pc_ctx = static_cast<ObPlanCacheCtx&>(ctx);
const ObPlanCacheObject *cache_obj = static_cast<const ObPlanCacheObject*>(obj);
if (is_inited_) {
ret = OB_INIT_TWICE;
LOG_WARN("init twice", K(ret));
} else if (OB_ISNULL(lib_cache_) || OB_ISNULL(cache_obj)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret));
} else if (NULL == (sess = pc_ctx.sql_ctx_.session_info_)) {
ret = OB_ERR_UNEXPECTED;
SQL_PC_LOG(WARN, "session info is null", K(ret));
} else if (NULL == (pc_alloc_ = lib_cache_->get_pc_allocator())) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid plan cache allocator", K_(pc_alloc), K(ret));
} else {
if (OB_FAIL(pc_key_.deep_copy(allocator_, pc_ctx.fp_result_.pc_key_))) {
LOG_WARN("fail to init plan cache key in pcv set", K(ret));
} else if (OB_FAIL(deep_copy_sql(pc_ctx.raw_sql_))) {
LOG_WARN("fail to deep_copy_sql", K(ret), K(pc_ctx.raw_sql_));
} else {
is_inited_ = true;
if (pc_ctx.exec_ctx_.get_min_cluster_version() != GET_MIN_CLUSTER_VERSION()) {
LOG_TRACE("Lob Debug, using remote min cluster version",
K(pc_ctx.exec_ctx_.get_min_cluster_version()),
K(GET_MIN_CLUSTER_VERSION()));
}
min_cluster_version_ = pc_ctx.exec_ctx_.get_min_cluster_version();
normal_parse_const_cnt_ = pc_ctx.normal_parse_const_cnt_;
LOG_TRACE("inited pcv set", K(pc_key_), K(ObTimeUtility::current_time()));
}
}
return ret;
}
void ObPCVSet::destroy()
{
if (is_inited_) {
while (!pcv_list_.is_empty()) {
ObPlanCacheValue *pcv= pcv_list_.get_first();
if (OB_ISNULL(pcv)) {
//do nothing;
} else {
pcv_list_.remove(pcv);
free_pcv(pcv);
pcv = NULL;
}
}
pc_key_.destory(allocator_);
pc_key_.reset();
if (NULL != sql_.ptr()) {
allocator_.free(sql_.ptr());
}
// free sql_id list
for (int64_t i = 0; i < sql_ids_.count(); i++) {
if (NULL != sql_ids_[i].ptr()) {
allocator_.free(sql_ids_[i].ptr());
}
}
sql_ids_.reset();
sql_.reset();
normal_parse_const_cnt_ = 0;
min_cluster_version_ = 0;
plan_num_ = 0;
need_check_gen_tbl_col_ = false;
is_inited_ = false;
expired_time_ = 0;
}
}
//1.Check if the number of constants recognized by fast parser is consistent with that recognized by normal parser
//2.by match each pcv's db_id, sys_vars, not params find the corresponding pcv
//3.get plan in pcv
int ObPCVSet::inner_get_cache_obj(ObILibCacheCtx &ctx,
ObILibCacheKey *key,
ObILibCacheObject *&cache_obj)
{
UNUSED(key);
int ret = OB_SUCCESS;
ObPlanCacheObject *plan = NULL;
ObPlanCacheCtx &pc_ctx = static_cast<ObPlanCacheCtx&>(ctx);
if (PC_PS_MODE == pc_ctx.mode_ || PC_PL_MODE == pc_ctx.mode_) {
if (normal_parse_const_cnt_ != pc_ctx.fp_result_.parameterized_params_.count()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("param num is not equal", K_(normal_parse_const_cnt),
"parameterized_params_count", pc_ctx.fp_result_.parameterized_params_.count());
}
} else {
if (normal_parse_const_cnt_ != pc_ctx.fp_result_.raw_params_.count()) {
ret = OB_ERR_UNEXPECTED;
SQL_PC_LOG(TRACE, "const number of fast parse and normal parse is different",
"fast_parse_const_num", pc_ctx.fp_result_.raw_params_.count(),
K_(normal_parse_const_cnt),
K(pc_ctx.fp_result_.raw_params_));
}
}
if (pc_ctx.exec_ctx_.get_min_cluster_version() != GET_MIN_CLUSTER_VERSION()) {
LOG_DEBUG("Lob Debug, using remote min cluster version",
K(pc_ctx.exec_ctx_.get_min_cluster_version()),
K(GET_MIN_CLUSTER_VERSION()));
}
if (OB_FAIL(ret)) {
} else if (min_cluster_version_ != pc_ctx.exec_ctx_.get_min_cluster_version()) {
ret = OB_OLD_SCHEMA_VERSION;
} else if (need_check_gen_tbl_col_) {
// Check for the possibility of generated table projection column name conflicts
bool contain_dup_col = false;
if (OB_FAIL(check_raw_param_for_dup_col(pc_ctx, contain_dup_col))) {
LOG_WARN("failed to check raw param for dup col", K(ret));
} else if (contain_dup_col) {
ret = OB_SQL_PC_NOT_EXIST;
}
}
if (OB_FAIL(ret)) {
} else if (OB_ISNULL(pc_ctx.sql_ctx_.schema_guard_) ||
OB_ISNULL(pc_ctx.sql_ctx_.session_info_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("unexpected null schema guard",
K(ret), K(pc_ctx.sql_ctx_.schema_guard_), K(pc_ctx.sql_ctx_.session_info_));
} else {
ObSEArray<PCVSchemaObj, 4> schema_array;
// plan cache matching temporary tables should always use the user-created session to ensure the correctness of semantics
// When executed remotely, a temporary session object will be created, and its session_id is also temporary,
// So here the get_sessid_for_table() rule must be used to determine
pc_ctx.sql_ctx_.schema_guard_->set_session_id(
pc_ctx.sql_ctx_.session_info_->get_sessid_for_table());
ObPlanCacheValue *matched_pcv = NULL;
int64_t new_tenant_schema_version = OB_INVALID_VERSION;
bool need_check_schema = true;
DLIST_FOREACH(pcv, pcv_list_) {
bool is_same = false;
LOG_DEBUG("get plan, pcv", K(pcv));
if (OB_FAIL(pcv->get_all_dep_schema(pc_ctx,
pc_ctx.sql_ctx_.session_info_->get_database_id(),
new_tenant_schema_version,
need_check_schema,
schema_array))) {
if (OB_OLD_SCHEMA_VERSION == ret) {
LOG_TRACE("failed to get all table schema", K(ret));
} else {
LOG_WARN("failed to get all table schema", K(ret));
}
} else if (OB_FAIL(pcv->match(pc_ctx, schema_array, is_same))) {
LOG_WARN("fail to match pcv when get plan", K(ret));
} else if (false == is_same) {
LOG_TRACE("failed to match param");
/*do nothing*/
} else {
matched_pcv = pcv;
if (OB_FAIL(pcv->choose_plan(pc_ctx, schema_array, plan))) {
LOG_TRACE("failed to get plan in plan cache value", K(ret));
}
break;
}
} //end foreach
// If tenant schema changes, but table schema has not expired, then update tenant schema
// plan must not be NULL, because the lower layer may have the behavior of overriding error codes, even if the plan does not match,
// ret is still success, at this point tenant schema version will be increased again, which may cause correctness issues
// bug link：
if (OB_SUCC(ret) && NULL != matched_pcv && NULL != plan) {
if (OB_FAIL(matched_pcv->lift_tenant_schema_version(new_tenant_schema_version))) {
LOG_WARN("failed to lift pcv's tenant schema version", K(ret));
} else if (new_tenant_schema_version != OB_INVALID_VERSION
&& OB_NOT_NULL(pc_ctx.exec_ctx_.get_physical_plan_ctx())) {
pc_ctx.exec_ctx_.get_physical_plan_ctx()->set_tenant_schema_version(
new_tenant_schema_version);
}
}
}
if (OB_SUCC(ret)) {
cache_obj = plan;
if (NULL == plan) {
ret = OB_SQL_PC_NOT_EXIST;
}
}
return ret;
}
//1.by match each pcv's db_id, sys_vars, not params find the corresponding pcv
//2.If matching pcv then add plan in pcv, otherwise regenerate pcv and add plan
int ObPCVSet::inner_add_cache_obj(ObILibCacheCtx &ctx,
ObILibCacheKey *key,
ObILibCacheObject *cache_obj)
{
UNUSED(key);
int ret = OB_SUCCESS;
bool is_new = true;
ObPlanCacheObject *plan = static_cast<ObPlanCacheObject*>(cache_obj);
ObPlanCacheCtx &pc_ctx = static_cast<ObPlanCacheCtx&>(ctx);
ObSEArray<PCVSchemaObj, 4> schema_array;
if (OB_ISNULL(plan) ||
OB_ISNULL(pc_ctx.sql_ctx_.schema_guard_) ||
OB_ISNULL(pc_ctx.sql_ctx_.session_info_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret), K(plan),
K(pc_ctx.sql_ctx_.schema_guard_),
K(pc_ctx.sql_ctx_.session_info_));
} else if (get_plan_num() >= MAX_PCV_SET_PLAN_NUM) {
static const int64_t PRINT_PLAN_EXCEEDS_LOG_INTERVAL = 20 * 1000 * 1000; // 20s
ret = OB_REACH_MEMORY_LIMIT;
if (REACH_TIME_INTERVAL(PRINT_PLAN_EXCEEDS_LOG_INTERVAL)) {
LOG_INFO("number of plans in a single pcv_set reach limit", K(ret), K(get_plan_num()), K(pc_ctx));
}
} else if (OB_FAIL(ObPlanCacheValue::get_all_dep_schema(*pc_ctx.sql_ctx_.schema_guard_,
plan->get_dependency_table(),
schema_array))) {
LOG_WARN("failed to get all dep schema", K(ret));
} else {
DLIST_FOREACH(pcv, pcv_list_) {
bool is_same = false;
LOG_DEBUG("add plan, pcv", K(pcv));
if (OB_FAIL(pcv->match(pc_ctx, schema_array, is_same))) {
LOG_WARN("fail to match pcv in pcv_set", K(ret));
} else if (is_same) {
is_new = false;
LOG_INFO("has identical pcv", K(is_same), K(pcv));
if (OB_FAIL(pcv->add_plan(*plan, schema_array, pc_ctx))) {
if (OB_SQL_PC_PLAN_DUPLICATE == ret
|| is_not_supported_err(ret)) {
LOG_TRACE("fail to add plan to pcv", K(ret));
} else {
LOG_WARN("fail to add plan to pcv", K(ret));
}
}
break;
}
} //for end
}
if (OB_SUCC(ret) && is_new) {
ObPlanCacheValue *pcv = NULL;
if (OB_FAIL(create_pcv_and_add_plan(plan,
pc_ctx,
schema_array,
pcv))) {
if (!is_not_supported_err(ret)) {
LOG_WARN("fail to create and add pcv", K(ret));
}
} else if (NULL == pcv) {
ret = OB_ERR_UNEXPECTED;
} else if (!pcv_list_.add_last(pcv)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("fail to add pcv to pcv_list", K(ret));
free_pcv(pcv);
pcv = NULL;
} else {
// do nothing
}
}
// Maintain a minimum merged version when adding a plan, used by the background for checking during eviction;
if (OB_SUCC(ret)) {
if (OB_FAIL(set_raw_param_info_if_needed(plan))) {
LOG_WARN("failed to set raw param info", K(ret));
} else {
// inc plan num if succeeds
plan_num_ += 1;
}
}
return ret;
}
// Generate pcv and add plan
int ObPCVSet::create_pcv_and_add_plan(ObPlanCacheObject *cache_obj,
ObPlanCacheCtx &pc_ctx,
const ObIArray<PCVSchemaObj> &schema_array,
ObPlanCacheValue *&new_pcv)
{
int ret = OB_SUCCESS;
new_pcv = nullptr;
common::ObString sql_id;
common::ObString sql_id_org(common::OB_MAX_SQL_ID_LENGTH, (const char*)&pc_ctx.sql_ctx_.sql_id_);
//create pcv and init
if (OB_ISNULL(cache_obj) ||
OB_ISNULL(pc_ctx.sql_ctx_.schema_guard_)) {
ret = OB_INVALID_ARGUMENT;
SQL_PC_LOG(WARN, "invalid argument", K(ret));
} else if (OB_FAIL(create_new_pcv(new_pcv))) {
SQL_PC_LOG(WARN, "failed to create new plan cache value", K(ret));
} else if (OB_UNLIKELY(nullptr == new_pcv)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected null for new_pcv", K(new_pcv));
} else if (OB_FAIL(new_pcv->init(this, cache_obj, pc_ctx))) {
SQL_PC_LOG(WARN, "failed to init plan cache value");
} else if (OB_FAIL(ob_write_string(allocator_, sql_id_org, sql_id))) {
SQL_PC_LOG(WARN, "failed to deep copy sql_id_", K(sql_id_org), K(ret));
} else if (OB_FAIL(push_sql_id(sql_id))) {
SQL_PC_LOG(WARN, "failed to push sql_id_", K(ret));
} else {
// do nothing
}
//add plan
if (OB_SUCC(ret)) {
if (OB_FAIL(new_pcv->add_plan(*cache_obj, schema_array, pc_ctx))) {
if (!is_not_supported_err(ret)) {
SQL_PC_LOG(WARN, "failed to add plan to plan cache value", K(ret));
}
}
}
if (OB_FAIL(ret) && nullptr != new_pcv) {
free_pcv(new_pcv);
new_pcv = nullptr;
}
return ret;
}
int ObPCVSet::deep_copy_sql(const ObString &sql)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(sql.ptr())) {
SQL_PC_LOG(TRACE, "sql is empty, ignore copy sql", K(ret), K(lbt()));
} else if (OB_FAIL(ob_write_string(allocator_, sql, sql_))) {
SQL_PC_LOG(WARN, "deep copy sql into pcv_set failed", K(ret), K(sql));
}
return ret;
}
int ObPCVSet::create_new_pcv(ObPlanCacheValue *&new_pcv)
{
int ret = OB_SUCCESS;
void *buff = nullptr;
new_pcv = nullptr;
if (nullptr == (buff = allocator_.alloc(sizeof(ObPlanCacheValue)))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("failed to allocate memory for ObPlanCacheValue", K(ret));
} else if (nullptr == (new_pcv = new(buff)ObPlanCacheValue())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to construct ObPlanCacheValue", K(ret));
} else {
// do nothing
}
if (OB_SUCC(ret)) {
// do nothing
} else if (nullptr != new_pcv) { // cleanup
new_pcv->~ObPlanCacheValue();
allocator_.free(new_pcv);
new_pcv = nullptr;
}
return ret;
}
void ObPCVSet::free_pcv(ObPlanCacheValue *pcv)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(pcv)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(pcv), K(ret));
} else {
pcv->~ObPlanCacheValue();
allocator_.free(pcv);
pcv = nullptr;
}
}
int ObPCVSet::set_raw_param_info_if_needed(ObPlanCacheObject *cache_obj)
{
int ret = OB_SUCCESS;
ObPhysicalPlan *plan = NULL;
col_field_arr_.reset();
col_field_arr_.set_allocator(&allocator_);
ObBitSet<> visited_idx;
PCColStruct col_item;
if (need_check_gen_tbl_col_) {
// do nothing
} else if (OB_ISNULL(cache_obj)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(cache_obj));
} else if (OB_ISNULL(plan = dynamic_cast<ObPhysicalPlan *>(cache_obj))) {
// do nothing
} else if (!plan->contain_paramed_column_field()) {
// do nothing
} else if (OB_FAIL(col_field_arr_.reserve(plan->get_field_columns().count()))) {
LOG_WARN("failed to init fixed array",
K(ret), K(plan->get_field_columns().count()));
} else {
for (int64_t i = 0; i < plan->get_field_columns().count(); i++) {
const ObField &cur_field = plan->get_field_columns().at(i);
if (!cur_field.is_paramed_select_item_ || OB_ISNULL(cur_field.paramed_ctx_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("Invalid argument", K(ret), K(cur_field.is_paramed_select_item_), K(cur_field.paramed_ctx_));
} else if (visited_idx.has_member(i) || !cur_field.paramed_ctx_->need_check_dup_name_) {
// do nothing
} else {
if (OB_FAIL(visited_idx.add_member(i))) {
LOG_WARN("failed to add member", K(ret), K(i));
} else if (OB_FAIL(col_item.param_idxs_.assign(cur_field.paramed_ctx_->param_idxs_))) {
LOG_WARN("failed to assign array", K(ret));
} else if (OB_FAIL(col_field_arr_.push_back(col_item))) {
LOG_WARN("failed to push back element", K(ret));
} else {
// do nothing
}
col_item.reset();
for (int64_t j = i + 1; OB_SUCC(ret) && j < plan->get_field_columns().count(); j++) {
const ObField &next_field = plan->get_field_columns().at(j);
if (!next_field.is_paramed_select_item_ || OB_ISNULL(next_field.paramed_ctx_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("Invalid argument", K(ret), K(next_field.is_paramed_select_item_), K(next_field.paramed_ctx_));
} else if (visited_idx.has_member(j) || !next_field.paramed_ctx_->need_check_dup_name_) {
// do nothing
} else if (ObCharset::case_compat_mode_equal(cur_field.paramed_ctx_->paramed_cname_,
next_field.paramed_ctx_->paramed_cname_)) {
if (OB_FAIL(visited_idx.add_member(j))) {
LOG_WARN("failed to add member", K(ret));
} else if (OB_FAIL(col_item.param_idxs_.assign(next_field.paramed_ctx_->param_idxs_))) {
LOG_WARN("failed to assign array", K(ret));
} else if (OB_FAIL(col_field_arr_.push_back(col_item))) {
LOG_WARN("failed to push back element");
} else {
col_item.reset();
}
} else {
// do nothing
}
} // for end
if (OB_SUCC(ret)) {
col_field_arr_.at(col_field_arr_.count() - 1).is_last_ = true;
}
}
}
if (OB_SUCC(ret)) {
need_check_gen_tbl_col_ = true;
}
}
return ret;
}
int ObPCVSet::check_raw_param_for_dup_col(ObPlanCacheCtx &pc_ctx, bool &contain_dup_col)
{
int ret = OB_SUCCESS;
contain_dup_col = false;
if (!need_check_gen_tbl_col_) {
// do nothing
} else {
for (int64_t cur_idx = 0; OB_SUCC(ret) && !contain_dup_col && cur_idx < col_field_arr_.count();
cur_idx++) {
if (col_field_arr_.at(cur_idx).is_last_) {
// do nothing
} else {
PCColStruct &left_col_item = col_field_arr_.at(cur_idx);
PCColStruct &right_col_item = col_field_arr_.at(cur_idx + 1);
bool all_same = true;
ObIArray<ObPCParam *> &raw_params = pc_ctx.fp_result_.raw_params_;
for (int64_t i = 0; OB_SUCC(ret) && all_same && i < left_col_item.param_idxs_.count(); i++) {
int64_t l_idx = left_col_item.param_idxs_.at(i);
int64_t r_idx = right_col_item.param_idxs_.at(i);
if (OB_ISNULL(raw_params.at(l_idx)) ||
OB_ISNULL(raw_params.at(r_idx)) ||
OB_ISNULL(raw_params.at(l_idx)->node_) ||
OB_ISNULL(raw_params.at(r_idx)->node_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret));
} else {
ObString l_tmp_str(raw_params.at(l_idx)->node_->text_len_,
raw_params.at(l_idx)->node_->raw_text_);
ObString r_tmp_str(raw_params.at(r_idx)->node_->text_len_,
raw_params.at(r_idx)->node_->raw_text_);
if (0 != l_tmp_str.compare(r_tmp_str)) {
all_same = false;
LOG_TRACE("raw text not matched", K(l_tmp_str), K(r_tmp_str));
}
}
} // for end
contain_dup_col = all_same;
}
}
}
return ret;
}
int ObPCVSet::check_contains_table(uint64_t db_id, common::ObString tab_name, bool &contains)
{
int ret = OB_SUCCESS;
DLIST_FOREACH(pcv, pcv_list_) {
if (OB_ISNULL(pcv)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(pcv), K(ret));
} else if (OB_FAIL(pcv->check_contains_table(db_id, tab_name, contains))) {
LOG_WARN("fail to check table name", K(ret), K(db_id), K(tab_name));
} else if (!contains) {
// continue find
} else {
break;
}
}
return ret;
}
bool ObPCVSet::set_expired_time()
{
bool ret = false;
int64_t expired_time = ATOMIC_LOAD(&expired_time_);
int64_t cur_time = ObTimeUtility::current_time();
const static int64_t REGENERATE_EXPIRED_PLAN_INTERVAL = 10 * 1000 * 1000L; // 10 second
if (expired_time + REGENERATE_EXPIRED_PLAN_INTERVAL < cur_time) {
ret = expired_time == ATOMIC_VCAS(&expired_time_, expired_time, cur_time);
}
return ret;
}
}
}