ClickHouse/src/Interpreters/InterpreterInsertQuery.cpp

371 lines
15 KiB
C++

#include <Interpreters/InterpreterInsertQuery.h>
#include <Access/AccessFlags.h>
#include <DataStreams/AddingDefaultBlockOutputStream.h>
#include <DataStreams/AddingDefaultsBlockInputStream.h>
#include <DataStreams/CheckConstraintsBlockOutputStream.h>
#include <DataStreams/CountingBlockOutputStream.h>
#include <DataStreams/InputStreamFromASTInsertQuery.h>
#include <DataStreams/NullAndDoCopyBlockInputStream.h>
#include <DataStreams/NullBlockOutputStream.h>
#include <DataStreams/PushingToViewsBlockOutputStream.h>
#include <DataStreams/SquashingBlockOutputStream.h>
#include <DataStreams/copyData.h>
#include <IO/ConnectionTimeoutsContext.h>
#include <Interpreters/InterpreterSelectWithUnionQuery.h>
#include <Interpreters/InterpreterWatchQuery.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTInsertQuery.h>
#include <Parsers/ASTSelectQuery.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Parsers/ASTTablesInSelectQuery.h>
#include <Processors/Sources/SinkToOutputStream.h>
#include <Processors/Sources/SourceFromInputStream.h>
#include <Processors/Transforms/ExpressionTransform.h>
#include <Processors/Transforms/MaterializingTransform.h>
#include <Storages/StorageDistributed.h>
#include <Storages/StorageMaterializedView.h>
#include <TableFunctions/TableFunctionFactory.h>
#include <Common/checkStackSize.h>
#include <Interpreters/QueryLog.h>
#include <Interpreters/TranslateQualifiedNamesVisitor.h>
#include <Interpreters/getTableExpressions.h>
#include <Interpreters/processColumnTransformers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NO_SUCH_COLUMN_IN_TABLE;
extern const int ILLEGAL_COLUMN;
extern const int DUPLICATE_COLUMN;
}
InterpreterInsertQuery::InterpreterInsertQuery(
const ASTPtr & query_ptr_, ContextPtr context_, bool allow_materialized_, bool no_squash_, bool no_destination_)
: WithContext(context_)
, query_ptr(query_ptr_)
, allow_materialized(allow_materialized_)
, no_squash(no_squash_)
, no_destination(no_destination_)
{
checkStackSize();
}
StoragePtr InterpreterInsertQuery::getTable(ASTInsertQuery & query)
{
if (query.table_function)
{
const auto & factory = TableFunctionFactory::instance();
TableFunctionPtr table_function_ptr = factory.get(query.table_function, getContext());
return table_function_ptr->execute(query.table_function, getContext(), table_function_ptr->getName());
}
query.table_id = getContext()->resolveStorageID(query.table_id);
return DatabaseCatalog::instance().getTable(query.table_id, getContext());
}
Block InterpreterInsertQuery::getSampleBlock(
const ASTInsertQuery & query,
const StoragePtr & table,
const StorageMetadataPtr & metadata_snapshot) const
{
Block table_sample_non_materialized = metadata_snapshot->getSampleBlockNonMaterialized();
/// If the query does not include information about columns
if (!query.columns)
{
if (no_destination)
return metadata_snapshot->getSampleBlockWithVirtuals(table->getVirtuals());
else
return table_sample_non_materialized;
}
Block table_sample = metadata_snapshot->getSampleBlock();
const auto columns_ast = processColumnTransformers(getContext()->getCurrentDatabase(), table, metadata_snapshot, query.columns);
/// Form the block based on the column names from the query
Block res;
for (const auto & identifier : columns_ast->children)
{
std::string current_name = identifier->getColumnName();
/// The table does not have a column with that name
if (!table_sample.has(current_name))
throw Exception("No such column " + current_name + " in table " + table->getStorageID().getNameForLogs(),
ErrorCodes::NO_SUCH_COLUMN_IN_TABLE);
if (!allow_materialized && !table_sample_non_materialized.has(current_name))
throw Exception("Cannot insert column " + current_name + ", because it is MATERIALIZED column.", ErrorCodes::ILLEGAL_COLUMN);
if (res.has(current_name))
throw Exception("Column " + current_name + " specified more than once", ErrorCodes::DUPLICATE_COLUMN);
res.insert(ColumnWithTypeAndName(table_sample.getByName(current_name).type, current_name));
}
return res;
}
/** A query that just reads all data without any complex computations or filetering.
* If we just pipe the result to INSERT, we don't have to use too many threads for read.
*/
static bool isTrivialSelect(const ASTPtr & select)
{
if (auto * select_query = select->as<ASTSelectQuery>())
{
const auto & tables = select_query->tables();
if (!tables)
return false;
const auto & tables_in_select_query = tables->as<ASTTablesInSelectQuery &>();
if (tables_in_select_query.children.size() != 1)
return false;
const auto & child = tables_in_select_query.children.front();
const auto & table_element = child->as<ASTTablesInSelectQueryElement &>();
const auto & table_expr = table_element.table_expression->as<ASTTableExpression &>();
if (table_expr.subquery)
return false;
/// Note: how to write it in more generic way?
return (!select_query->distinct
&& !select_query->limit_with_ties
&& !select_query->prewhere()
&& !select_query->where()
&& !select_query->groupBy()
&& !select_query->having()
&& !select_query->orderBy()
&& !select_query->limitBy());
}
/// This query is ASTSelectWithUnionQuery subquery
return false;
};
BlockIO InterpreterInsertQuery::execute()
{
const Settings & settings = getContext()->getSettingsRef();
auto & query = query_ptr->as<ASTInsertQuery &>();
BlockIO res;
StoragePtr table = getTable(query);
auto table_lock = table->lockForShare(getContext()->getInitialQueryId(), settings.lock_acquire_timeout);
auto metadata_snapshot = table->getInMemoryMetadataPtr();
auto query_sample_block = getSampleBlock(query, table, metadata_snapshot);
if (!query.table_function)
getContext()->checkAccess(AccessType::INSERT, query.table_id, query_sample_block.getNames());
bool is_distributed_insert_select = false;
if (query.select && table->isRemote() && settings.parallel_distributed_insert_select)
{
// Distributed INSERT SELECT
if (auto maybe_pipeline = table->distributedWrite(query, getContext()))
{
res.pipeline = std::move(*maybe_pipeline);
is_distributed_insert_select = true;
}
}
BlockOutputStreams out_streams;
if (!is_distributed_insert_select || query.watch)
{
size_t out_streams_size = 1;
if (query.select)
{
bool is_trivial_insert_select = false;
if (settings.optimize_trivial_insert_select)
{
const auto & select_query = query.select->as<ASTSelectWithUnionQuery &>();
const auto & selects = select_query.list_of_selects->children;
const auto & union_modes = select_query.list_of_modes;
/// ASTSelectWithUnionQuery is not normalized now, so it may pass some queries which can be Trivial select queries
is_trivial_insert_select
= std::all_of(
union_modes.begin(),
union_modes.end(),
[](const ASTSelectWithUnionQuery::Mode & mode) { return mode == ASTSelectWithUnionQuery::Mode::ALL; })
&& std::all_of(selects.begin(), selects.end(), [](const ASTPtr & select) { return isTrivialSelect(select); });
}
if (is_trivial_insert_select)
{
/** When doing trivial INSERT INTO ... SELECT ... FROM table,
* don't need to process SELECT with more than max_insert_threads
* and it's reasonable to set block size for SELECT to the desired block size for INSERT
* to avoid unnecessary squashing.
*/
Settings new_settings = getContext()->getSettings();
new_settings.max_threads = std::max<UInt64>(1, settings.max_insert_threads);
if (settings.min_insert_block_size_rows && table->prefersLargeBlocks())
new_settings.max_block_size = settings.min_insert_block_size_rows;
auto new_context = Context::createCopy(context);
new_context->setSettings(new_settings);
InterpreterSelectWithUnionQuery interpreter_select{
query.select, new_context, SelectQueryOptions(QueryProcessingStage::Complete, 1)};
res = interpreter_select.execute();
}
else
{
/// Passing 1 as subquery_depth will disable limiting size of intermediate result.
InterpreterSelectWithUnionQuery interpreter_select{
query.select, getContext(), SelectQueryOptions(QueryProcessingStage::Complete, 1)};
res = interpreter_select.execute();
}
if (table->supportsParallelInsert() && settings.max_insert_threads > 1)
out_streams_size = std::min(size_t(settings.max_insert_threads), res.pipeline.getNumStreams());
res.pipeline.resize(out_streams_size);
}
else if (query.watch)
{
InterpreterWatchQuery interpreter_watch{ query.watch, getContext() };
res = interpreter_watch.execute();
res.pipeline.init(Pipe(std::make_shared<SourceFromInputStream>(std::move(res.in))));
}
for (size_t i = 0; i < out_streams_size; i++)
{
/// We create a pipeline of several streams, into which we will write data.
BlockOutputStreamPtr out;
/// NOTE: we explicitly ignore bound materialized views when inserting into Kafka Storage.
/// Otherwise we'll get duplicates when MV reads same rows again from Kafka.
if (table->noPushingToViews() && !no_destination)
out = table->write(query_ptr, metadata_snapshot, getContext());
else
out = std::make_shared<PushingToViewsBlockOutputStream>(table, metadata_snapshot, getContext(), query_ptr, no_destination);
/// Note that we wrap transforms one on top of another, so we write them in reverse of data processing order.
/// Checking constraints. It must be done after calculation of all defaults, so we can check them on calculated columns.
if (const auto & constraints = metadata_snapshot->getConstraints(); !constraints.empty())
out = std::make_shared<CheckConstraintsBlockOutputStream>(
query.table_id, out, out->getHeader(), metadata_snapshot->getConstraints(), getContext());
/// Actually we don't know structure of input blocks from query/table,
/// because some clients break insertion protocol (columns != header)
out = std::make_shared<AddingDefaultBlockOutputStream>(
out, query_sample_block, metadata_snapshot->getColumns(), getContext());
/// It's important to squash blocks as early as possible (before other transforms),
/// because other transforms may work inefficient if block size is small.
/// Do not squash blocks if it is a sync INSERT into Distributed, since it lead to double bufferization on client and server side.
/// Client-side bufferization might cause excessive timeouts (especially in case of big blocks).
if (!(settings.insert_distributed_sync && table->isRemote()) && !no_squash && !query.watch)
{
bool table_prefers_large_blocks = table->prefersLargeBlocks();
out = std::make_shared<SquashingBlockOutputStream>(
out,
out->getHeader(),
table_prefers_large_blocks ? settings.min_insert_block_size_rows : settings.max_block_size,
table_prefers_large_blocks ? settings.min_insert_block_size_bytes : 0);
}
auto out_wrapper = std::make_shared<CountingBlockOutputStream>(out);
out_wrapper->setProcessListElement(getContext()->getProcessListElement());
out = std::move(out_wrapper);
out_streams.emplace_back(std::move(out));
}
}
/// What type of query: INSERT or INSERT SELECT or INSERT WATCH?
if (is_distributed_insert_select)
{
/// Pipeline was already built.
}
else if (query.select || query.watch)
{
const auto & header = out_streams.at(0)->getHeader();
auto actions_dag = ActionsDAG::makeConvertingActions(
res.pipeline.getHeader().getColumnsWithTypeAndName(),
header.getColumnsWithTypeAndName(),
ActionsDAG::MatchColumnsMode::Position);
auto actions = std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(getContext()));
res.pipeline.addSimpleTransform([&](const Block & in_header) -> ProcessorPtr
{
return std::make_shared<ExpressionTransform>(in_header, actions);
});
res.pipeline.addSimpleTransform([&](const Block & in_header) -> ProcessorPtr
{
return std::make_shared<MaterializingTransform>(in_header);
});
res.pipeline.setSinks([&](const Block &, QueryPipeline::StreamType type) -> ProcessorPtr
{
if (type != QueryPipeline::StreamType::Main)
return nullptr;
auto stream = std::move(out_streams.back());
out_streams.pop_back();
return std::make_shared<SinkToOutputStream>(std::move(stream));
});
if (!allow_materialized)
{
for (const auto & column : metadata_snapshot->getColumns())
if (column.default_desc.kind == ColumnDefaultKind::Materialized && header.has(column.name))
throw Exception("Cannot insert column " + column.name + ", because it is MATERIALIZED column.", ErrorCodes::ILLEGAL_COLUMN);
}
}
else if (query.data && !query.has_tail) /// can execute without additional data
{
// res.out = std::move(out_streams.at(0));
res.in = std::make_shared<InputStreamFromASTInsertQuery>(query_ptr, nullptr, query_sample_block, getContext(), nullptr);
res.in = std::make_shared<NullAndDoCopyBlockInputStream>(res.in, out_streams.at(0));
}
else
res.out = std::move(out_streams.at(0));
res.pipeline.addStorageHolder(table);
if (const auto * mv = dynamic_cast<const StorageMaterializedView *>(table.get()))
{
if (auto inner_table = mv->tryGetTargetTable())
res.pipeline.addStorageHolder(inner_table);
}
return res;
}
StorageID InterpreterInsertQuery::getDatabaseTable() const
{
return query_ptr->as<ASTInsertQuery &>().table_id;
}
void InterpreterInsertQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr context_) const
{
elem.query_kind = "Insert";
const auto & insert_table = context_->getInsertionTable();
if (!insert_table.empty())
{
elem.query_databases.insert(insert_table.getDatabaseName());
elem.query_tables.insert(insert_table.getFullNameNotQuoted());
}
}
}