ClickHouse/dbms/src/Storages/WindowView/StorageWindowView.cpp

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#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <Columns/ColumnTuple.h>
#include <Columns/ColumnsNumber.h>
#include <DataStreams/BlocksBlockInputStream.h>
#include <DataStreams/IBlockOutputStream.h>
#include <DataStreams/MaterializingBlockInputStream.h>
#include <DataStreams/NullBlockInputStream.h>
#include <DataStreams/OneBlockInputStream.h>
#include <DataStreams/SquashingBlockInputStream.h>
#include <DataStreams/copyData.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionsWindow.h>
#include <Interpreters/AddDefaultDatabaseVisitor.h>
#include <Interpreters/Context.h>
#include <Interpreters/InDepthNodeVisitor.h>
#include <Interpreters/InterpreterDropQuery.h>
#include <Interpreters/InterpreterSelectQuery.h>
#include <Interpreters/getTableExpressions.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/ASTDropQuery.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTSelectQuery.h>
#include <Parsers/ASTSubquery.h>
#include <Parsers/ASTTablesInSelectQuery.h>
#include <Parsers/ASTWatchQuery.h>
#include <Parsers/formatAST.h>
#include <Storages/StorageFactory.h>
#include <Common/typeid_cast.h>
#include <Storages/WindowView/StorageWindowView.h>
#include <Storages/WindowView/WindowViewBlockInputStream.h>
#include <Storages/WindowView/WindowViewBlocksBlockInputStream.h>
#include <Storages/WindowView/WindowViewProxyStorage.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int INCORRECT_QUERY;
extern const int TABLE_WAS_NOT_DROPPED;
extern const int QUERY_IS_NOT_SUPPORTED_IN_WINDOW_VIEW;
extern const int SUPPORT_IS_DISABLED;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
const auto RESCHEDULE_MS = 500;
class ParserStageMergeableOneMatcher
{
public:
using Visitor = InDepthNodeVisitor<ParserStageMergeableOneMatcher, true>;
struct Data
{
ASTPtr window_function;
String window_column_name;
// String window_column_name_or_alias;
bool is_tumble = false;
bool is_hop = false;
};
static bool needChildVisit(ASTPtr & node, const ASTPtr &)
{
if (node->as<ASTFunction>())
return false;
return true;
}
static void visit(ASTPtr & ast, Data & data)
{
if (const auto * t = ast->as<ASTFunction>())
visit(*t, ast, data);
}
private:
static void visit(const ASTFunction & node, ASTPtr & node_ptr, Data & data)
{
if (node.name == "TUMBLE")
{
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if (!data.window_function)
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{
data.is_tumble = true;
data.window_column_name = node.getColumnName();
data.window_function = node.clone();
}
else if (serializeAST(node) != serializeAST(*data.window_function))
throw Exception("WINDOW VIEW only support ONE WINDOW FUNCTION", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_WINDOW_VIEW);
}
else if (node.name == "HOP")
{
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if (!data.window_function)
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{
data.is_hop = true;
data.window_function = node.clone();
auto ptr_ = node.clone();
std::static_pointer_cast<ASTFunction>(ptr_)->setAlias("");
auto arrayJoin = makeASTFunction("arrayJoin", ptr_);
arrayJoin->alias = node.alias;
data.window_column_name = arrayJoin->getColumnName();
node_ptr = arrayJoin;
}
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else if (serializeAST(node) != serializeAST(*data.window_function))
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throw Exception("WINDOW VIEW only support ONE WINDOW FUNCTION", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_WINDOW_VIEW);
}
}
};
}
static void extractDependentTable(ASTSelectQuery & query, String & select_database_name, String & select_table_name)
{
auto db_and_table = getDatabaseAndTable(query, 0);
ASTPtr subquery = extractTableExpression(query, 0);
if (!db_and_table && !subquery)
return;
if (db_and_table)
{
select_table_name = db_and_table->table;
if (db_and_table->database.empty())
{
db_and_table->database = select_database_name;
AddDefaultDatabaseVisitor visitor(select_database_name);
visitor.visit(query);
}
else
select_database_name = db_and_table->database;
}
else if (auto * ast_select = subquery->as<ASTSelectWithUnionQuery>())
{
if (ast_select->list_of_selects->children.size() != 1)
throw Exception("UNION is not supported for WINDOW VIEW", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_WINDOW_VIEW);
auto & inner_query = ast_select->list_of_selects->children.at(0);
extractDependentTable(inner_query->as<ASTSelectQuery &>(), select_database_name, select_table_name);
}
else
throw Exception(
"Logical error while creating StorageWindowView."
" Could not retrieve table name from select query.",
DB::ErrorCodes::LOGICAL_ERROR);
}
void StorageWindowView::checkTableCanBeDropped() const
{
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auto table_id = getStorageID();
Dependencies dependencies = global_context.getDependencies(table_id);
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if (!dependencies.empty())
{
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StorageID dependent_table_id = dependencies.front();
throw Exception("Table has dependency " + dependent_table_id.getNameForLogs(), ErrorCodes::TABLE_WAS_NOT_DROPPED);
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}
}
void StorageWindowView::drop(TableStructureWriteLockHolder &)
{
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auto table_id = getStorageID();
global_context.removeDependency(select_table_id, table_id);
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std::lock_guard lock(mutex);
is_dropped = true;
condition.notify_all();
}
inline void StorageWindowView::flushToTable()
{
//write into dependent table
StoragePtr target_table = getTargetTable();
auto _blockInputStreamPtr = getNewBlocksInputStreamPtr();
auto _lock = target_table->lockStructureForShare(true, global_context.getCurrentQueryId());
auto stream = target_table->write(getInnerQuery(), global_context);
copyData(*_blockInputStreamPtr, *stream);
}
UInt32 StorageWindowView::getWindowUpperBound(UInt32 time_sec)
{
switch (window_kind)
{
#define CASE_WINDOW_KIND(KIND) \
case IntervalKind::KIND: \
{ \
UInt32 start = ToStartOfTransform<IntervalKind::KIND>::execute(time_sec, window_num_units, time_zone); \
return AddTime<IntervalKind::KIND>::execute(start, window_num_units, time_zone); \
}
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CASE_WINDOW_KIND(Second)
CASE_WINDOW_KIND(Minute)
CASE_WINDOW_KIND(Hour)
CASE_WINDOW_KIND(Day)
CASE_WINDOW_KIND(Week)
CASE_WINDOW_KIND(Month)
CASE_WINDOW_KIND(Quarter)
CASE_WINDOW_KIND(Year)
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#undef CASE_WINDOW_KIND
}
__builtin_unreachable();
}
void StorageWindowView::threadFuncToTable()
{
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while (!shutdown_called && !target_table_id.empty())
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{
std::unique_lock lock(flushTableMutex);
UInt64 timestamp_usec = static_cast<UInt64>(Poco::Timestamp().epochMicroseconds());
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UInt64 w_end = static_cast<UInt64>(getWindowUpperBound(static_cast<UInt32>(timestamp_usec / 1000000))) * 1000000;
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condition.wait_for(lock, std::chrono::microseconds(w_end - timestamp_usec));
try
{
if (refreshBlockStatus())
flushToTable();
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
break;
}
}
if (!shutdown_called)
toTableTask->scheduleAfter(RESCHEDULE_MS);
}
BlockInputStreams StorageWindowView::watch(
const Names & /*column_names*/,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum & processed_stage,
size_t /*max_block_size*/,
const unsigned /*num_streams*/)
{
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if (!target_table_id.empty())
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throw Exception("WATCH query is disabled for " + getName() + " when constructed with 'TO' clause.", ErrorCodes::INCORRECT_QUERY);
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if (active_ptr.use_count() > 1)
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throw Exception("WATCH query is already attached, WINDOW VIEW only supports attaching one watch query.", ErrorCodes::INCORRECT_QUERY);
ASTWatchQuery & query = typeid_cast<ASTWatchQuery &>(*query_info.query);
bool has_limit = false;
UInt64 limit = 0;
if (query.limit_length)
{
has_limit = true;
limit = safeGet<UInt64>(typeid_cast<ASTLiteral &>(*query.limit_length).value);
}
auto reader = std::make_shared<WindowViewBlockInputStream>(
std::static_pointer_cast<StorageWindowView>(shared_from_this()),
active_ptr,
has_limit,
limit,
context.getSettingsRef().temporary_window_view_timeout.totalSeconds());
{
std::lock_guard no_users_thread_lock(no_users_thread_mutex);
if (no_users_thread.joinable())
{
std::lock_guard lock(no_users_thread_wakeup_mutex);
no_users_thread_wakeup = true;
no_users_thread_condition.notify_one();
}
}
processed_stage = QueryProcessingStage::Complete;
return {reader};
}
Block StorageWindowView::getHeader() const
{
if (!sample_block)
{
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auto storage = global_context.getTable(select_table_id);
sample_block = InterpreterSelectQuery(getInnerQuery(), global_context, storage, SelectQueryOptions(QueryProcessingStage::Complete))
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.getSampleBlock();
for (size_t i = 0; i < sample_block.columns(); ++i)
sample_block.safeGetByPosition(i).column = sample_block.safeGetByPosition(i).column->convertToFullColumnIfConst();
}
return sample_block;
}
StorageWindowView::StorageWindowView(
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const StorageID & table_id_,
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Context & local_context,
const ASTCreateQuery & query,
const ColumnsDescription & columns_)
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: IStorage(table_id_)
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, global_context(local_context.getGlobalContext())
, time_zone(DateLUT::instance())
{
setColumns(columns_);
if (!query.select)
throw Exception("SELECT query is not specified for " + getName(), ErrorCodes::INCORRECT_QUERY);
/// Default value, if only table name exist in the query
if (query.select->list_of_selects->children.size() != 1)
throw Exception("UNION is not supported for Window View", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_WINDOW_VIEW);
auto inner_query_ = query.select->list_of_selects->children.at(0);
ASTSelectQuery & select_query = typeid_cast<ASTSelectQuery &>(*inner_query_);
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String select_database_name = local_context.getCurrentDatabase();
String select_table_name;
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extractDependentTable(select_query, select_database_name, select_table_name);
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select_table_id = StorageID(select_database_name, select_table_name);
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inner_query = innerQueryParser(select_query);
/// If the table is not specified - use the table `system.one`
if (select_table_name.empty())
{
select_database_name = "system";
select_table_name = "one";
}
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global_context.addDependency(select_table_id, table_id_);
parent_storage = local_context.getTable(select_table_id);
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if (!query.to_table.empty())
{
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target_table_id = StorageID(query.to_database, query.to_table);
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}
is_temporary = query.temporary;
temporary_window_view_timeout = local_context.getSettingsRef().temporary_window_view_timeout.totalSeconds();
mergeable_blocks = std::make_shared<std::list<BlocksListPtr>>();
active_ptr = std::make_shared<bool>(true);
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toTableTask = global_context.getSchedulePool().createTask(getStorageID().getFullTableName(), [this] { threadFuncToTable(); });
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toTableTask->deactivate();
}
ASTPtr StorageWindowView::innerQueryParser(ASTSelectQuery & query)
{
if (!query.groupBy())
throw Exception("GROUP BY query is required for " + getName(), ErrorCodes::INCORRECT_QUERY);
// parse stage mergeable
ASTPtr result = query.clone();
ASTPtr expr_list = result;
ParserStageMergeableOneMatcher::Data stageMergeableOneData;
ParserStageMergeableOneMatcher::Visitor(stageMergeableOneData).visit(expr_list);
if (!stageMergeableOneData.is_tumble && !stageMergeableOneData.is_hop)
throw Exception("WINDOW FUNCTION is not specified for " + getName(), ErrorCodes::INCORRECT_QUERY);
window_column_name = stageMergeableOneData.window_column_name;
// parser window function
ASTFunction & window_function = typeid_cast<ASTFunction &>(*stageMergeableOneData.window_function);
ASTExpressionList &window_function_args = typeid_cast<ASTExpressionList&>(*window_function.arguments);
const auto & children = window_function_args.children;
const auto & interval_p1 = std::static_pointer_cast<ASTFunction>(children.at(1));
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if (!interval_p1 || !startsWith(interval_p1->name, "toInterval"))
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throw Exception("Illegal type of last argument of function " + interval_p1->name + " should be Interval", ErrorCodes::ILLEGAL_COLUMN);
String interval_str = interval_p1->name.substr(10);
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if (interval_str == "Second")
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window_kind = IntervalKind::Second;
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else if (interval_str == "Minute")
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window_kind = IntervalKind::Minute;
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else if (interval_str == "Hour")
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window_kind = IntervalKind::Hour;
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else if (interval_str == "Day")
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window_kind = IntervalKind::Day;
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else if (interval_str == "Week")
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window_kind = IntervalKind::Week;
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else if (interval_str == "Month")
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window_kind = IntervalKind::Month;
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else if (interval_str == "Quarter")
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window_kind = IntervalKind::Quarter;
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else if (interval_str == "Year")
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window_kind = IntervalKind::Year;
const auto & interval_units_p1 = std::static_pointer_cast<ASTLiteral>(interval_p1->children.front()->children.front());
window_num_units = stoi(interval_units_p1->value.get<String>());
return result;
}
void StorageWindowView::writeIntoWindowView(StorageWindowView & window_view, const Block & block, const Context & context)
{
BlockInputStreams streams = {std::make_shared<OneBlockInputStream>(block)};
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auto window_proxy_storage = std::make_shared<WindowViewProxyStorage>(StorageID("", "WindowViewProxyStorage"),
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window_view.getParentStorage(), std::move(streams), QueryProcessingStage::FetchColumns);
InterpreterSelectQuery select_block(
window_view.getInnerQuery(), context, window_proxy_storage, QueryProcessingStage::WithMergeableState);
auto data_mergeable_stream = std::make_shared<MaterializingBlockInputStream>(select_block.execute().in);
BlocksListPtr new_mergeable_blocks = std::make_shared<BlocksList>();
while (Block block_ = data_mergeable_stream->read())
{
const ColumnTuple * column_tuple = checkAndGetColumn<ColumnTuple>(block_.getByName(window_view.window_column_name).column.get());
block_.insert(
{ColumnUInt8::create(block_.rows(), WINDOW_VIEW_FIRE_STATUS::WAITING), std::make_shared<DataTypeUInt8>(), "____fire_status"});
block_.insert({column_tuple->getColumnPtr(1), std::make_shared<DataTypeDateTime>(), "____w_end"});
new_mergeable_blocks->push_back(block_);
}
if (new_mergeable_blocks->empty())
return;
{
std::unique_lock lock(window_view.mutex);
window_view.getMergeableBlocksList()->push_back(new_mergeable_blocks);
}
window_view.condition.notify_all();
}
StoragePtr StorageWindowView::getTargetTable() const
{
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return global_context.getTable(target_table_id);
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}
StoragePtr StorageWindowView::tryGetTargetTable() const
{
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return global_context.tryGetTable(target_table_id);
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}
void StorageWindowView::startup()
{
// Start the working thread
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if (!target_table_id.empty())
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toTableTask->activateAndSchedule();
startNoUsersThread(temporary_window_view_timeout);
}
void StorageWindowView::shutdown()
{
bool expected = false;
if (!shutdown_called.compare_exchange_strong(expected, true))
return;
toTableTask->deactivate();
{
std::lock_guard no_users_thread_lock(no_users_thread_mutex);
if (no_users_thread.joinable())
{
{
std::lock_guard lock(no_users_thread_wakeup_mutex);
no_users_thread_wakeup = true;
no_users_thread_condition.notify_one();
}
}
}
}
StorageWindowView::~StorageWindowView()
{
shutdown();
{
std::lock_guard lock(no_users_thread_mutex);
if (no_users_thread.joinable())
no_users_thread.detach();
}
}
bool StorageWindowView::refreshBlockStatus()
{
UInt32 timestamp_now = std::time(nullptr);
for (BlocksListPtr mergeable_block : *mergeable_blocks)
{
for (Block & block : *mergeable_block)
{
auto & col_wend = block.getByName("____w_end").column;
const auto & wend_data = static_cast<const ColumnUInt32 &>(*col_wend).getData();
auto & col_status = block.getByName("____fire_status").column;
const auto & col_status_data = static_cast<const ColumnUInt8 &>(*col_status).getData();
for (size_t i = 0; i < col_wend->size(); ++i)
{
if (wend_data[i] < timestamp_now && col_status_data[i] == WINDOW_VIEW_FIRE_STATUS::WAITING)
return true;
}
}
}
return false;
}
BlockInputStreamPtr StorageWindowView::getNewBlocksInputStreamPtr()
{
if (mergeable_blocks->empty())
return {std::make_shared<NullBlockInputStream>(getHeader())};
{
std::lock_guard lock(mutex);
//delete fired blocks
for (BlocksListPtr mergeable_block : *mergeable_blocks)
{
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mergeable_block->remove_if([](Block & block_)
{
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auto & column_ = block_.getByName("____fire_status").column;
const auto & data = static_cast<const ColumnUInt8 &>(*column_).getData();
for (size_t i = 0; i < column_->size(); ++i)
{
if (data[i] != WINDOW_VIEW_FIRE_STATUS::RETIRED)
return false;
}
return true;
});
}
mergeable_blocks->remove_if([](BlocksListPtr & ptr) { return ptr->size() == 0; });
if (mergeable_blocks->empty())
return {std::make_shared<NullBlockInputStream>(getHeader())};
// mark blocks can be fired
UInt32 timestamp_now = std::time(nullptr);
for (BlocksListPtr mergeable_block : *mergeable_blocks)
{
for (Block & block : *mergeable_block)
{
auto & col_wend = block.getByName("____w_end").column;
const auto & wend_data = static_cast<const ColumnUInt32 &>(*col_wend).getData();
auto & col_status = block.getByName("____fire_status").column;
auto col_status_mutable = col_status->assumeMutable();
auto & col_status_data = static_cast<ColumnUInt8 &>(*col_status_mutable).getData();
for (size_t i = 0; i < col_wend->size(); ++i)
{
if (wend_data[i] < timestamp_now && col_status_data[i] == WINDOW_VIEW_FIRE_STATUS::WAITING)
col_status_data[i] = WINDOW_VIEW_FIRE_STATUS::READY;
}
col_status = std::move(col_status_mutable);
}
}
}
BlockInputStreams from;
auto sample_block_ = mergeable_blocks->front()->front().cloneEmpty(); //TODO: 改为全局
BlockInputStreamPtr stream = std::make_shared<WindowViewBlocksBlockInputStream>(mergeable_blocks, sample_block_, mutex);
from.push_back(std::move(stream));
auto proxy_storage = std::make_shared<WindowViewProxyStorage>(
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StorageID("", "WindowViewProxyStorage"), getParentStorage(), std::move(from), QueryProcessingStage::WithMergeableState);
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InterpreterSelectQuery select(getInnerQuery(), global_context, proxy_storage, QueryProcessingStage::Complete);
BlockInputStreamPtr data = std::make_shared<MaterializingBlockInputStream>(select.execute().in);
return data;
}
BlocksPtr StorageWindowView::getNewBlocks()
{
auto res = getNewBlocksInputStreamPtr();
BlocksPtr blocks = std::make_shared<Blocks>();
while (Block this_block = res->read())
blocks->push_back(this_block);
return blocks;
}
void StorageWindowView::noUsersThread(std::shared_ptr<StorageWindowView> storage, const UInt64 & timeout)
{
bool drop_table = false;
if (storage->shutdown_called)
return;
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auto table_id = storage->getStorageID();
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{
while (1)
{
std::unique_lock lock(storage->no_users_thread_wakeup_mutex);
if (!storage->no_users_thread_condition.wait_for(lock, std::chrono::seconds(timeout), [&] { return storage->no_users_thread_wakeup; }))
{
storage->no_users_thread_wakeup = false;
if (storage->shutdown_called)
return;
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if (!storage->global_context.getDependencies(table_id).empty())
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continue;
drop_table = true;
}
break;
}
}
if (drop_table)
{
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if (storage->global_context.tryGetTable(table_id))
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{
try
{
/// We create and execute `drop` query for this table
auto drop_query = std::make_shared<ASTDropQuery>();
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drop_query->database = table_id.database_name;
drop_query->table = table_id.table_name;
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drop_query->kind = ASTDropQuery::Kind::Drop;
ASTPtr ast_drop_query = drop_query;
InterpreterDropQuery drop_interpreter(ast_drop_query, storage->global_context);
drop_interpreter.execute();
}
catch (...)
{
}
}
}
}
void StorageWindowView::startNoUsersThread(const UInt64 & timeout)
{
bool expected = false;
if (!start_no_users_thread_called.compare_exchange_strong(expected, true))
return;
if (is_temporary)
{
std::lock_guard no_users_thread_lock(no_users_thread_mutex);
if (shutdown_called)
return;
if (no_users_thread.joinable())
{
{
std::lock_guard lock(no_users_thread_wakeup_mutex);
no_users_thread_wakeup = true;
no_users_thread_condition.notify_one();
}
no_users_thread.join();
}
{
std::lock_guard lock(no_users_thread_wakeup_mutex);
no_users_thread_wakeup = false;
}
if (!is_dropped)
no_users_thread = std::thread(&StorageWindowView::noUsersThread,
std::static_pointer_cast<StorageWindowView>(shared_from_this()), timeout);
}
start_no_users_thread_called = false;
}
void registerStorageWindowView(StorageFactory & factory)
{
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factory.registerStorage("WindowView", [](const StorageFactory::Arguments & args)
{
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if (!args.attach && !args.local_context.getSettingsRef().allow_experimental_window_view)
throw Exception(
"Experimental WINDOW VIEW feature is not enabled (the setting 'allow_experimental_window_view')",
ErrorCodes::SUPPORT_IS_DISABLED);
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return StorageWindowView::create(args.table_id, args.local_context, args.query, args.columns);
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});
}
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}