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ClickHouse/src/Planner/PlannerJoinTree.cpp

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#include <Planner/PlannerJoinTree.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionFactory.h>
#include <Access/Common/AccessFlags.h>
#include <Access/ContextAccess.h>
#include <Storages/IStorage.h>
#include <Storages/StorageDictionary.h>
#include <Analyzer/ConstantNode.h>
#include <Analyzer/ColumnNode.h>
#include <Analyzer/TableNode.h>
#include <Analyzer/TableFunctionNode.h>
#include <Analyzer/QueryNode.h>
#include <Analyzer/UnionNode.h>
#include <Analyzer/JoinNode.h>
#include <Analyzer/ArrayJoinNode.h>
#include <Analyzer/Utils.h>
#include <Processors/Sources/NullSource.h>
#include <Processors/QueryPlan/SortingStep.h>
#include <Processors/QueryPlan/CreateSetAndFilterOnTheFlyStep.h>
#include <Processors/QueryPlan/ReadFromPreparedSource.h>
#include <Processors/QueryPlan/ExpressionStep.h>
#include <Processors/QueryPlan/JoinStep.h>
#include <Processors/QueryPlan/ArrayJoinStep.h>
#include <Interpreters/Context.h>
#include <Interpreters/IJoin.h>
#include <Interpreters/TableJoin.h>
#include <Interpreters/HashJoin.h>
#include <Interpreters/ArrayJoinAction.h>
#include <Planner/CollectColumnIdentifiers.h>
#include <Planner/Planner.h>
#include <Planner/PlannerJoins.h>
#include <Planner/PlannerActionsVisitor.h>
#include <Planner/Utils.h>
namespace DB
{
namespace ErrorCodes
{
extern const int INVALID_JOIN_ON_EXPRESSION;
extern const int LOGICAL_ERROR;
extern const int NOT_IMPLEMENTED;
extern const int SYNTAX_ERROR;
extern const int ACCESS_DENIED;
extern const int PARAMETER_OUT_OF_BOUND;
extern const int TOO_MANY_COLUMNS;
extern const int UNSUPPORTED_METHOD;
}
namespace
{
/// Check if current user has privileges to SELECT columns from table
void checkAccessRights(const TableNode & table_node, const Names & column_names, const ContextPtr & query_context)
{
const auto & storage_id = table_node.getStorageID();
const auto & storage_snapshot = table_node.getStorageSnapshot();
if (column_names.empty())
{
/** For a trivial queries like "SELECT count() FROM table", "SELECT 1 FROM table" access is granted if at least
* one table column is accessible.
*/
auto access = query_context->getAccess();
for (const auto & column : storage_snapshot->metadata->getColumns())
{
if (access->isGranted(AccessType::SELECT, storage_id.database_name, storage_id.table_name, column.name))
return;
}
throw Exception(ErrorCodes::ACCESS_DENIED,
"{}: Not enough privileges. To execute this query it's necessary to have grant SELECT for at least one column on {}",
query_context->getUserName(),
storage_id.getFullTableName());
}
query_context->checkAccess(AccessType::SELECT, storage_id, column_names);
}
NameAndTypePair chooseSmallestColumnToReadFromStorage(const StoragePtr & storage, const StorageSnapshotPtr & storage_snapshot)
{
/** We need to read at least one column to find the number of rows.
* We will find a column with minimum <compressed_size, type_size, uncompressed_size>.
* Because it is the column that is cheapest to read.
*/
class ColumnWithSize
{
public:
ColumnWithSize(NameAndTypePair column_, ColumnSize column_size_)
: column(std::move(column_))
, compressed_size(column_size_.data_compressed)
, uncompressed_size(column_size_.data_uncompressed)
, type_size(column.type->haveMaximumSizeOfValue() ? column.type->getMaximumSizeOfValueInMemory() : 100)
{
}
bool operator<(const ColumnWithSize & rhs) const
{
return std::tie(compressed_size, type_size, uncompressed_size)
< std::tie(rhs.compressed_size, rhs.type_size, rhs.uncompressed_size);
}
NameAndTypePair column;
size_t compressed_size = 0;
size_t uncompressed_size = 0;
size_t type_size = 0;
};
std::vector<ColumnWithSize> columns_with_sizes;
auto column_sizes = storage->getColumnSizes();
auto column_names_and_types = storage_snapshot->getColumns(GetColumnsOptions(GetColumnsOptions::AllPhysical).withSubcolumns());
if (!column_sizes.empty())
{
for (auto & column_name_and_type : column_names_and_types)
{
auto it = column_sizes.find(column_name_and_type.name);
if (it == column_sizes.end())
continue;
columns_with_sizes.emplace_back(column_name_and_type, it->second);
}
}
NameAndTypePair result;
if (!columns_with_sizes.empty())
result = std::min_element(columns_with_sizes.begin(), columns_with_sizes.end())->column;
else
/// If we have no information about columns sizes, choose a column of minimum size of its data type
result = ExpressionActions::getSmallestColumn(column_names_and_types);
return result;
}
JoinTreeQueryPlan buildQueryPlanForTableExpression(const QueryTreeNodePtr & table_expression,
const SelectQueryInfo & select_query_info,
const SelectQueryOptions & select_query_options,
PlannerContextPtr & planner_context,
bool is_single_table_expression)
{
const auto & query_context = planner_context->getQueryContext();
const auto & settings = query_context->getSettingsRef();
QueryProcessingStage::Enum from_stage = QueryProcessingStage::Enum::FetchColumns;
auto * table_node = table_expression->as<TableNode>();
auto * table_function_node = table_expression->as<TableFunctionNode>();
auto * query_node = table_expression->as<QueryNode>();
auto * union_node = table_expression->as<UnionNode>();
QueryPlan query_plan;
auto & table_expression_data = planner_context->getTableExpressionDataOrThrow(table_expression);
if (table_node || table_function_node)
{
const auto & storage = table_node ? table_node->getStorage() : table_function_node->getStorage();
const auto & storage_snapshot = table_node ? table_node->getStorageSnapshot() : table_function_node->getStorageSnapshot();
auto table_expression_query_info = select_query_info;
table_expression_query_info.table_expression = table_expression;
size_t max_streams = settings.max_threads;
size_t max_threads_execute_query = settings.max_threads;
/** With distributed query processing, almost no computations are done in the threads,
* but wait and receive data from remote servers.
* If we have 20 remote servers, and max_threads = 8, then it would not be efficient to
* connect and ask only 8 servers at a time.
* To simultaneously query more remote servers,
* instead of max_threads, max_distributed_connections is used.
*/
bool is_remote = table_expression_data.isRemote();
if (is_remote)
{
max_streams = settings.max_distributed_connections;
max_threads_execute_query = settings.max_distributed_connections;
}
UInt64 max_block_size = settings.max_block_size;
auto & main_query_node = select_query_info.query_tree->as<QueryNode &>();
if (is_single_table_expression)
{
size_t limit_length = 0;
if (main_query_node.hasLimit())
{
/// Constness of limit is validated during query analysis stage
limit_length = main_query_node.getLimit()->as<ConstantNode &>().getValue().safeGet<UInt64>();
}
size_t limit_offset = 0;
if (main_query_node.hasOffset())
{
/// Constness of offset is validated during query analysis stage
limit_offset = main_query_node.getOffset()->as<ConstantNode &>().getValue().safeGet<UInt64>();
}
/** If not specified DISTINCT, WHERE, GROUP BY, HAVING, ORDER BY, JOIN, LIMIT BY, LIMIT WITH TIES
* but LIMIT is specified, and limit + offset < max_block_size,
* then as the block size we will use limit + offset (not to read more from the table than requested),
* and also set the number of threads to 1.
*/
if (main_query_node.hasLimit() &&
!main_query_node.isDistinct() &&
!main_query_node.isLimitWithTies() &&
!main_query_node.hasPrewhere() &&
!main_query_node.hasWhere() &&
select_query_info.filter_asts.empty() &&
!main_query_node.hasGroupBy() &&
!main_query_node.hasHaving() &&
!main_query_node.hasOrderBy() &&
!main_query_node.hasLimitBy() &&
!select_query_info.need_aggregate &&
!select_query_info.has_window &&
limit_length <= std::numeric_limits<UInt64>::max() - limit_offset)
{
if (limit_length + limit_offset < max_block_size)
{
max_block_size = std::max<UInt64>(1, limit_length + limit_offset);
max_streams = 1;
max_threads_execute_query = 1;
}
if (limit_length + limit_offset < select_query_info.local_storage_limits.local_limits.size_limits.max_rows)
{
table_expression_query_info.limit = limit_length + limit_offset;
}
}
if (!max_block_size)
throw Exception(ErrorCodes::PARAMETER_OUT_OF_BOUND,
"Setting 'max_block_size' cannot be zero");
}
if (max_streams == 0)
max_streams = 1;
/// If necessary, we request more sources than the number of threads - to distribute the work evenly over the threads
if (max_streams > 1 && !is_remote)
max_streams = static_cast<size_t>(max_streams * settings.max_streams_to_max_threads_ratio);
if (table_node)
table_expression_query_info.table_expression_modifiers = table_node->getTableExpressionModifiers();
else
table_expression_query_info.table_expression_modifiers = table_function_node->getTableExpressionModifiers();
from_stage = storage->getQueryProcessingStage(query_context, select_query_options.to_stage, storage_snapshot, table_expression_query_info);
Names columns_names = table_expression_data.getColumnNames();
/** The current user must have the SELECT privilege.
* We do not check access rights for table functions because they have been already checked in ITableFunction::execute().
*/
if (table_node)
{
auto column_names_with_aliases = columns_names;
const auto & alias_columns_names = table_expression_data.getAliasColumnsNames();
column_names_with_aliases.insert(column_names_with_aliases.end(), alias_columns_names.begin(), alias_columns_names.end());
checkAccessRights(*table_node, column_names_with_aliases, planner_context->getQueryContext());
}
/// Limitation on the number of columns to read
if (settings.max_columns_to_read && columns_names.size() > settings.max_columns_to_read)
throw Exception(ErrorCodes::TOO_MANY_COLUMNS,
"Limit for number of columns to read exceeded. Requested: {}, maximum: {}",
columns_names.size(),
settings.max_columns_to_read);
if (columns_names.empty())
{
auto additional_column_to_read = chooseSmallestColumnToReadFromStorage(storage, storage_snapshot);
const auto & column_identifier = planner_context->getGlobalPlannerContext()->createColumnIdentifier(additional_column_to_read, table_expression);
columns_names.push_back(additional_column_to_read.name);
table_expression_data.addColumn(additional_column_to_read, column_identifier);
}
bool need_rewrite_query_with_final = storage->needRewriteQueryWithFinal(columns_names);
if (need_rewrite_query_with_final)
{
if (table_expression_query_info.table_expression_modifiers)
{
const auto & table_expression_modifiers = table_expression_query_info.table_expression_modifiers;
auto sample_size_ratio = table_expression_modifiers->getSampleSizeRatio();
auto sample_offset_ratio = table_expression_modifiers->getSampleOffsetRatio();
table_expression_query_info.table_expression_modifiers = TableExpressionModifiers(true /*has_final*/,
sample_size_ratio,
sample_offset_ratio);
}
else
{
table_expression_query_info.table_expression_modifiers = TableExpressionModifiers(true /*has_final*/,
{} /*sample_size_ratio*/,
{} /*sample_offset_ratio*/);
}
}
storage->read(query_plan, columns_names, storage_snapshot, table_expression_query_info, query_context, from_stage, max_block_size, max_streams);
if (query_plan.isInitialized())
{
/** Specify the number of threads only if it wasn't specified in storage.
*
* But in case of remote query and prefer_localhost_replica=1 (default)
* The inner local query (that is done in the same process, without
* network interaction), it will setMaxThreads earlier and distributed
* query will not update it.
*/
if (!query_plan.getMaxThreads() || is_remote)
query_plan.setMaxThreads(max_threads_execute_query);
}
else
{
/// Create step which reads from empty source if storage has no data.
auto source_header = storage_snapshot->getSampleBlockForColumns(columns_names);
Pipe pipe(std::make_shared<NullSource>(source_header));
auto read_from_pipe = std::make_unique<ReadFromPreparedSource>(std::move(pipe));
read_from_pipe->setStepDescription("Read from NullSource");
query_plan.addStep(std::move(read_from_pipe));
}
}
else if (query_node || union_node)
{
if (table_expression_data.getColumnNames().empty())
{
const auto & projection_columns = query_node ? query_node->getProjectionColumns() : union_node->computeProjectionColumns();
NamesAndTypesList projection_columns_list(projection_columns.begin(), projection_columns.end());
auto additional_column_to_read = ExpressionActions::getSmallestColumn(projection_columns_list);
const auto & column_identifier = planner_context->getGlobalPlannerContext()->createColumnIdentifier(additional_column_to_read, table_expression);
table_expression_data.addColumn(additional_column_to_read, column_identifier);
}
auto subquery_options = select_query_options.subquery();
Planner subquery_planner(table_expression, subquery_options, planner_context->getGlobalPlannerContext());
/// Propagate storage limits to subquery
subquery_planner.addStorageLimits(*select_query_info.storage_limits);
subquery_planner.buildQueryPlanIfNeeded();
query_plan = std::move(subquery_planner).extractQueryPlan();
}
else
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "Expected table, table function, query or union. Actual {}",
table_expression->formatASTForErrorMessage());
}
if (from_stage == QueryProcessingStage::FetchColumns)
{
auto rename_actions_dag = std::make_shared<ActionsDAG>(query_plan.getCurrentDataStream().header.getColumnsWithTypeAndName());
ActionsDAG::NodeRawConstPtrs updated_actions_dag_outputs;
for (auto & output_node : rename_actions_dag->getOutputs())
{
const auto * column_identifier = table_expression_data.getColumnIdentifierOrNull(output_node->result_name);
if (!column_identifier)
continue;
updated_actions_dag_outputs.push_back(&rename_actions_dag->addAlias(*output_node, *column_identifier));
}
rename_actions_dag->getOutputs() = std::move(updated_actions_dag_outputs);
auto rename_step = std::make_unique<ExpressionStep>(query_plan.getCurrentDataStream(), rename_actions_dag);
rename_step->setStepDescription("Change column names to column identifiers");
query_plan.addStep(std::move(rename_step));
}
else
{
Planner planner(select_query_info.query_tree,
SelectQueryOptions(from_stage).analyze(),
select_query_info.planner_context);
planner.buildQueryPlanIfNeeded();
auto expected_header = planner.getQueryPlan().getCurrentDataStream().header;
materializeBlockInplace(expected_header);
auto rename_actions_dag = ActionsDAG::makeConvertingActions(
query_plan.getCurrentDataStream().header.getColumnsWithTypeAndName(),
expected_header.getColumnsWithTypeAndName(),
ActionsDAG::MatchColumnsMode::Position,
true /*ignore_constant_values*/);
auto rename_step = std::make_unique<ExpressionStep>(query_plan.getCurrentDataStream(), std::move(rename_actions_dag));
std::string step_description = table_expression_data.isRemote() ? "Change remote column names to local column names" : "Change column names";
rename_step->setStepDescription(std::move(step_description));
query_plan.addStep(std::move(rename_step));
}
return {std::move(query_plan), from_stage};
}
JoinTreeQueryPlan buildQueryPlanForJoinNode(const QueryTreeNodePtr & join_table_expression,
JoinTreeQueryPlan left_join_tree_query_plan,
JoinTreeQueryPlan right_join_tree_query_plan,
const ColumnIdentifierSet & outer_scope_columns,
PlannerContextPtr & planner_context)
{
auto & join_node = join_table_expression->as<JoinNode &>();
if (left_join_tree_query_plan.from_stage != QueryProcessingStage::FetchColumns)
throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
"JOIN {} left table expression expected to process query to fetch columns stage. Actual {}",
join_node.formatASTForErrorMessage(),
QueryProcessingStage::toString(left_join_tree_query_plan.from_stage));
auto left_plan = std::move(left_join_tree_query_plan.query_plan);
auto left_plan_output_columns = left_plan.getCurrentDataStream().header.getColumnsWithTypeAndName();
if (right_join_tree_query_plan.from_stage != QueryProcessingStage::FetchColumns)
throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
"JOIN {} right table expression expected to process query to fetch columns stage. Actual {}",
join_node.formatASTForErrorMessage(),
QueryProcessingStage::toString(right_join_tree_query_plan.from_stage));
auto right_plan = std::move(right_join_tree_query_plan.query_plan);
auto right_plan_output_columns = right_plan.getCurrentDataStream().header.getColumnsWithTypeAndName();
JoinClausesAndActions join_clauses_and_actions;
JoinKind join_kind = join_node.getKind();
std::optional<bool> join_constant;
if (join_node.getStrictness() == JoinStrictness::All)
join_constant = tryExtractConstantFromJoinNode(join_table_expression);
if (join_constant)
{
/** If there is JOIN with always true constant, we transform it to cross.
* If there is JOIN with always false constant, we do not process JOIN keys.
* It is expected by join algorithm to handle such case.
*
* Example: SELECT * FROM test_table AS t1 INNER JOIN test_table AS t2 ON 1;
*/
if (*join_constant)
join_kind = JoinKind::Cross;
}
else if (join_node.isOnJoinExpression())
{
join_clauses_and_actions = buildJoinClausesAndActions(left_plan_output_columns,
right_plan_output_columns,
join_table_expression,
planner_context);
join_clauses_and_actions.left_join_expressions_actions->projectInput();
auto left_join_expressions_actions_step = std::make_unique<ExpressionStep>(left_plan.getCurrentDataStream(), join_clauses_and_actions.left_join_expressions_actions);
left_join_expressions_actions_step->setStepDescription("JOIN actions");
left_plan.addStep(std::move(left_join_expressions_actions_step));
join_clauses_and_actions.right_join_expressions_actions->projectInput();
auto right_join_expressions_actions_step = std::make_unique<ExpressionStep>(right_plan.getCurrentDataStream(), join_clauses_and_actions.right_join_expressions_actions);
right_join_expressions_actions_step->setStepDescription("JOIN actions");
right_plan.addStep(std::move(right_join_expressions_actions_step));
}
std::unordered_map<ColumnIdentifier, DataTypePtr> left_plan_column_name_to_cast_type;
std::unordered_map<ColumnIdentifier, DataTypePtr> right_plan_column_name_to_cast_type;
if (join_node.isUsingJoinExpression())
{
auto & join_node_using_columns_list = join_node.getJoinExpression()->as<ListNode &>();
for (auto & join_node_using_node : join_node_using_columns_list.getNodes())
{
auto & join_node_using_column_node = join_node_using_node->as<ColumnNode &>();
auto & inner_columns_list = join_node_using_column_node.getExpressionOrThrow()->as<ListNode &>();
auto & left_inner_column_node = inner_columns_list.getNodes().at(0);
auto & left_inner_column = left_inner_column_node->as<ColumnNode &>();
auto & right_inner_column_node = inner_columns_list.getNodes().at(1);
auto & right_inner_column = right_inner_column_node->as<ColumnNode &>();
const auto & join_node_using_column_node_type = join_node_using_column_node.getColumnType();
if (!left_inner_column.getColumnType()->equals(*join_node_using_column_node_type))
{
const auto & left_inner_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(left_inner_column_node);
left_plan_column_name_to_cast_type.emplace(left_inner_column_identifier, join_node_using_column_node_type);
}
if (!right_inner_column.getColumnType()->equals(*join_node_using_column_node_type))
{
const auto & right_inner_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(right_inner_column_node);
right_plan_column_name_to_cast_type.emplace(right_inner_column_identifier, join_node_using_column_node_type);
}
}
}
auto join_cast_plan_output_nodes = [&](QueryPlan & plan_to_add_cast, std::unordered_map<std::string, DataTypePtr> & plan_column_name_to_cast_type)
{
auto cast_actions_dag = std::make_shared<ActionsDAG>(plan_to_add_cast.getCurrentDataStream().header.getColumnsWithTypeAndName());
for (auto & output_node : cast_actions_dag->getOutputs())
{
auto it = plan_column_name_to_cast_type.find(output_node->result_name);
if (it == plan_column_name_to_cast_type.end())
continue;
const auto & cast_type = it->second;
output_node = &cast_actions_dag->addCast(*output_node, cast_type, output_node->result_name);
}
cast_actions_dag->projectInput();
auto cast_join_columns_step
= std::make_unique<ExpressionStep>(plan_to_add_cast.getCurrentDataStream(), std::move(cast_actions_dag));
cast_join_columns_step->setStepDescription("Cast JOIN USING columns");
plan_to_add_cast.addStep(std::move(cast_join_columns_step));
};
if (!left_plan_column_name_to_cast_type.empty())
join_cast_plan_output_nodes(left_plan, left_plan_column_name_to_cast_type);
if (!right_plan_column_name_to_cast_type.empty())
join_cast_plan_output_nodes(right_plan, right_plan_column_name_to_cast_type);
const auto & query_context = planner_context->getQueryContext();
const auto & settings = query_context->getSettingsRef();
bool join_use_nulls = settings.join_use_nulls;
auto to_nullable_function = FunctionFactory::instance().get("toNullable", query_context);
auto join_cast_plan_columns_to_nullable = [&](QueryPlan & plan_to_add_cast)
{
auto cast_actions_dag = std::make_shared<ActionsDAG>(plan_to_add_cast.getCurrentDataStream().header.getColumnsWithTypeAndName());
for (auto & output_node : cast_actions_dag->getOutputs())
{
if (planner_context->getGlobalPlannerContext()->hasColumnIdentifier(output_node->result_name))
output_node = &cast_actions_dag->addFunction(to_nullable_function, {output_node}, output_node->result_name);
}
cast_actions_dag->projectInput();
auto cast_join_columns_step = std::make_unique<ExpressionStep>(plan_to_add_cast.getCurrentDataStream(), std::move(cast_actions_dag));
cast_join_columns_step->setStepDescription("Cast JOIN columns to Nullable");
plan_to_add_cast.addStep(std::move(cast_join_columns_step));
};
if (join_use_nulls)
{
if (isFull(join_kind))
{
join_cast_plan_columns_to_nullable(left_plan);
join_cast_plan_columns_to_nullable(right_plan);
}
else if (isLeft(join_kind))
{
join_cast_plan_columns_to_nullable(right_plan);
}
else if (isRight(join_kind))
{
join_cast_plan_columns_to_nullable(left_plan);
}
}
auto table_join = std::make_shared<TableJoin>(settings, query_context->getTemporaryVolume());
table_join->getTableJoin() = join_node.toASTTableJoin()->as<ASTTableJoin &>();
table_join->getTableJoin().kind = join_kind;
if (join_kind == JoinKind::Comma)
{
join_kind = JoinKind::Cross;
table_join->getTableJoin().kind = JoinKind::Cross;
}
table_join->setIsJoinWithConstant(join_constant != std::nullopt);
if (join_node.isOnJoinExpression())
{
const auto & join_clauses = join_clauses_and_actions.join_clauses;
bool is_asof = table_join->strictness() == JoinStrictness::Asof;
if (join_clauses.size() > 1)
{
if (is_asof)
throw Exception(ErrorCodes::NOT_IMPLEMENTED,
"ASOF join {} doesn't support multiple ORs for keys in JOIN ON section",
join_node.formatASTForErrorMessage());
}
auto & table_join_clauses = table_join->getClauses();
for (const auto & join_clause : join_clauses)
{
table_join_clauses.emplace_back();
auto & table_join_clause = table_join_clauses.back();
const auto & join_clause_left_key_nodes = join_clause.getLeftKeyNodes();
const auto & join_clause_right_key_nodes = join_clause.getRightKeyNodes();
size_t join_clause_key_nodes_size = join_clause_left_key_nodes.size();
assert(join_clause_key_nodes_size == join_clause_right_key_nodes.size());
for (size_t i = 0; i < join_clause_key_nodes_size; ++i)
{
table_join_clause.key_names_left.push_back(join_clause_left_key_nodes[i]->result_name);
table_join_clause.key_names_right.push_back(join_clause_right_key_nodes[i]->result_name);
}
const auto & join_clause_get_left_filter_condition_nodes = join_clause.getLeftFilterConditionNodes();
if (!join_clause_get_left_filter_condition_nodes.empty())
{
if (join_clause_get_left_filter_condition_nodes.size() != 1)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"JOIN {} left filter conditions size must be 1. Actual {}",
join_node.formatASTForErrorMessage(),
join_clause_get_left_filter_condition_nodes.size());
const auto & join_clause_left_filter_condition_name = join_clause_get_left_filter_condition_nodes[0]->result_name;
table_join_clause.analyzer_left_filter_condition_column_name = join_clause_left_filter_condition_name;
}
const auto & join_clause_get_right_filter_condition_nodes = join_clause.getRightFilterConditionNodes();
if (!join_clause_get_right_filter_condition_nodes.empty())
{
if (join_clause_get_right_filter_condition_nodes.size() != 1)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"JOIN {} right filter conditions size must be 1. Actual {}",
join_node.formatASTForErrorMessage(),
join_clause_get_right_filter_condition_nodes.size());
const auto & join_clause_right_filter_condition_name = join_clause_get_right_filter_condition_nodes[0]->result_name;
table_join_clause.analyzer_right_filter_condition_column_name = join_clause_right_filter_condition_name;
}
if (is_asof)
{
if (!join_clause.hasASOF())
throw Exception(ErrorCodes::INVALID_JOIN_ON_EXPRESSION,
"JOIN {} no inequality in ASOF JOIN ON section.",
join_node.formatASTForErrorMessage());
if (table_join_clause.key_names_left.size() <= 1)
throw Exception(ErrorCodes::SYNTAX_ERROR,
"JOIN {} ASOF join needs at least one equi-join column",
join_node.formatASTForErrorMessage());
}
if (join_clause.hasASOF())
{
const auto & asof_conditions = join_clause.getASOFConditions();
assert(asof_conditions.size() == 1);
const auto & asof_condition = asof_conditions[0];
table_join->setAsofInequality(asof_condition.asof_inequality);
/// Execution layer of JOIN algorithms expects that ASOF keys are last JOIN keys
std::swap(table_join_clause.key_names_left.at(asof_condition.key_index), table_join_clause.key_names_left.back());
std::swap(table_join_clause.key_names_right.at(asof_condition.key_index), table_join_clause.key_names_right.back());
}
}
}
else if (join_node.isUsingJoinExpression())
{
auto & table_join_clauses = table_join->getClauses();
table_join_clauses.emplace_back();
auto & table_join_clause = table_join_clauses.back();
auto & using_list = join_node.getJoinExpression()->as<ListNode &>();
for (auto & join_using_node : using_list.getNodes())
{
auto & join_using_column_node = join_using_node->as<ColumnNode &>();
auto & using_join_columns_list = join_using_column_node.getExpressionOrThrow()->as<ListNode &>();
auto & using_join_left_join_column_node = using_join_columns_list.getNodes().at(0);
auto & using_join_right_join_column_node = using_join_columns_list.getNodes().at(1);
const auto & left_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(using_join_left_join_column_node);
const auto & right_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(using_join_right_join_column_node);
table_join_clause.key_names_left.push_back(left_column_identifier);
table_join_clause.key_names_right.push_back(right_column_identifier);
}
}
const Block & left_header = left_plan.getCurrentDataStream().header;
auto left_table_names = left_header.getNames();
NameSet left_table_names_set(left_table_names.begin(), left_table_names.end());
auto columns_from_joined_table = right_plan.getCurrentDataStream().header.getNamesAndTypesList();
table_join->setColumnsFromJoinedTable(columns_from_joined_table, left_table_names_set, "");
for (auto & column_from_joined_table : columns_from_joined_table)
{
/// Add columns from joined table only if they are presented in outer scope, otherwise they can be dropped
if (planner_context->getGlobalPlannerContext()->hasColumnIdentifier(column_from_joined_table.name) &&
outer_scope_columns.contains(column_from_joined_table.name))
table_join->addJoinedColumn(column_from_joined_table);
}
const Block & right_header = right_plan.getCurrentDataStream().header;
auto join_algorithm = chooseJoinAlgorithm(table_join, join_node.getRightTableExpression(), left_header, right_header, planner_context);
auto result_plan = QueryPlan();
if (join_algorithm->isFilled())
{
auto filled_join_step = std::make_unique<FilledJoinStep>(
left_plan.getCurrentDataStream(),
join_algorithm,
settings.max_block_size);
filled_join_step->setStepDescription("Filled JOIN");
left_plan.addStep(std::move(filled_join_step));
result_plan = std::move(left_plan);
}
else
{
auto add_sorting = [&] (QueryPlan & plan, const Names & key_names, JoinTableSide join_table_side)
{
SortDescription sort_description;
sort_description.reserve(key_names.size());
for (const auto & key_name : key_names)
sort_description.emplace_back(key_name);
SortingStep::Settings sort_settings(*query_context);
auto sorting_step = std::make_unique<SortingStep>(
plan.getCurrentDataStream(),
std::move(sort_description),
0 /*limit*/,
sort_settings,
settings.optimize_sorting_by_input_stream_properties);
sorting_step->setStepDescription(fmt::format("Sort {} before JOIN", join_table_side));
plan.addStep(std::move(sorting_step));
};
auto crosswise_connection = CreateSetAndFilterOnTheFlyStep::createCrossConnection();
auto add_create_set = [&settings, crosswise_connection](QueryPlan & plan, const Names & key_names, JoinTableSide join_table_side)
{
auto creating_set_step = std::make_unique<CreateSetAndFilterOnTheFlyStep>(
plan.getCurrentDataStream(),
key_names,
settings.max_rows_in_set_to_optimize_join,
crosswise_connection,
join_table_side);
creating_set_step->setStepDescription(fmt::format("Create set and filter {} joined stream", join_table_side));
auto * step_raw_ptr = creating_set_step.get();
plan.addStep(std::move(creating_set_step));
return step_raw_ptr;
};
if (join_algorithm->pipelineType() == JoinPipelineType::YShaped)
{
const auto & join_clause = table_join->getOnlyClause();
bool kind_allows_filtering = isInner(join_kind) || isLeft(join_kind) || isRight(join_kind);
if (settings.max_rows_in_set_to_optimize_join > 0 && kind_allows_filtering)
{
auto * left_set = add_create_set(left_plan, join_clause.key_names_left, JoinTableSide::Left);
auto * right_set = add_create_set(right_plan, join_clause.key_names_right, JoinTableSide::Right);
if (isInnerOrLeft(join_kind))
right_set->setFiltering(left_set->getSet());
if (isInnerOrRight(join_kind))
left_set->setFiltering(right_set->getSet());
}
add_sorting(left_plan, join_clause.key_names_left, JoinTableSide::Left);
add_sorting(right_plan, join_clause.key_names_right, JoinTableSide::Right);
}
auto join_pipeline_type = join_algorithm->pipelineType();
auto join_step = std::make_unique<JoinStep>(
left_plan.getCurrentDataStream(),
right_plan.getCurrentDataStream(),
std::move(join_algorithm),
settings.max_block_size,
settings.max_threads,
false /*optimize_read_in_order*/);
join_step->setStepDescription(fmt::format("JOIN {}", join_pipeline_type));
std::vector<QueryPlanPtr> plans;
plans.emplace_back(std::make_unique<QueryPlan>(std::move(left_plan)));
plans.emplace_back(std::make_unique<QueryPlan>(std::move(right_plan)));
result_plan.unitePlans(std::move(join_step), {std::move(plans)});
}
auto drop_unused_columns_after_join_actions_dag = std::make_shared<ActionsDAG>(result_plan.getCurrentDataStream().header.getColumnsWithTypeAndName());
ActionsDAG::NodeRawConstPtrs drop_unused_columns_after_join_actions_dag_updated_outputs;
std::unordered_set<std::string_view> drop_unused_columns_after_join_actions_dag_updated_outputs_names;
std::optional<size_t> first_skipped_column_node_index;
auto & drop_unused_columns_after_join_actions_dag_outputs = drop_unused_columns_after_join_actions_dag->getOutputs();
size_t drop_unused_columns_after_join_actions_dag_outputs_size = drop_unused_columns_after_join_actions_dag_outputs.size();
for (size_t i = 0; i < drop_unused_columns_after_join_actions_dag_outputs_size; ++i)
{
const auto & output = drop_unused_columns_after_join_actions_dag_outputs[i];
const auto & global_planner_context = planner_context->getGlobalPlannerContext();
if (drop_unused_columns_after_join_actions_dag_updated_outputs_names.contains(output->result_name)
|| !global_planner_context->hasColumnIdentifier(output->result_name))
continue;
if (!outer_scope_columns.contains(output->result_name))
{
if (!first_skipped_column_node_index)
first_skipped_column_node_index = i;
continue;
}
drop_unused_columns_after_join_actions_dag_updated_outputs.push_back(output);
drop_unused_columns_after_join_actions_dag_updated_outputs_names.insert(output->result_name);
}
/** It is expected that JOIN TREE query plan will contain at least 1 column, even if there are no columns in outer scope.
*
* Example: SELECT count() FROM test_table_1 AS t1, test_table_2 AS t2;
*/
if (drop_unused_columns_after_join_actions_dag_updated_outputs.empty() && first_skipped_column_node_index)
drop_unused_columns_after_join_actions_dag_updated_outputs.push_back(drop_unused_columns_after_join_actions_dag_outputs[*first_skipped_column_node_index]);
drop_unused_columns_after_join_actions_dag_outputs = std::move(drop_unused_columns_after_join_actions_dag_updated_outputs);
auto drop_unused_columns_after_join_transform_step = std::make_unique<ExpressionStep>(result_plan.getCurrentDataStream(), std::move(drop_unused_columns_after_join_actions_dag));
drop_unused_columns_after_join_transform_step->setStepDescription("DROP unused columns after JOIN");
result_plan.addStep(std::move(drop_unused_columns_after_join_transform_step));
return {std::move(result_plan), QueryProcessingStage::FetchColumns};
}
JoinTreeQueryPlan buildQueryPlanForArrayJoinNode(const QueryTreeNodePtr & array_join_table_expression,
JoinTreeQueryPlan join_tree_query_plan,
const ColumnIdentifierSet & outer_scope_columns,
PlannerContextPtr & planner_context)
{
auto & array_join_node = array_join_table_expression->as<ArrayJoinNode &>();
if (join_tree_query_plan.from_stage != QueryProcessingStage::FetchColumns)
throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
"ARRAY JOIN {} table expression expected to process query to fetch columns stage. Actual {}",
array_join_node.formatASTForErrorMessage(),
QueryProcessingStage::toString(join_tree_query_plan.from_stage));
auto plan = std::move(join_tree_query_plan.query_plan);
auto plan_output_columns = plan.getCurrentDataStream().header.getColumnsWithTypeAndName();
ActionsDAGPtr array_join_action_dag = std::make_shared<ActionsDAG>(plan_output_columns);
PlannerActionsVisitor actions_visitor(planner_context);
std::unordered_set<std::string> array_join_expressions_output_nodes;
NameSet array_join_column_names;
for (auto & array_join_expression : array_join_node.getJoinExpressions().getNodes())
{
const auto & array_join_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(array_join_expression);
array_join_column_names.insert(array_join_column_identifier);
auto & array_join_expression_column = array_join_expression->as<ColumnNode &>();
auto expression_dag_index_nodes = actions_visitor.visit(array_join_action_dag, array_join_expression_column.getExpressionOrThrow());
for (auto & expression_dag_index_node : expression_dag_index_nodes)
{
const auto * array_join_column_node = &array_join_action_dag->addAlias(*expression_dag_index_node, array_join_column_identifier);
array_join_action_dag->getOutputs().push_back(array_join_column_node);
array_join_expressions_output_nodes.insert(array_join_column_node->result_name);
}
}
array_join_action_dag->projectInput();
auto array_join_actions = std::make_unique<ExpressionStep>(plan.getCurrentDataStream(), array_join_action_dag);
array_join_actions->setStepDescription("ARRAY JOIN actions");
plan.addStep(std::move(array_join_actions));
auto drop_unused_columns_before_array_join_actions_dag = std::make_shared<ActionsDAG>(plan.getCurrentDataStream().header.getColumnsWithTypeAndName());
ActionsDAG::NodeRawConstPtrs drop_unused_columns_before_array_join_actions_dag_updated_outputs;
std::unordered_set<std::string_view> drop_unused_columns_before_array_join_actions_dag_updated_outputs_names;
auto & drop_unused_columns_before_array_join_actions_dag_outputs = drop_unused_columns_before_array_join_actions_dag->getOutputs();
size_t drop_unused_columns_before_array_join_actions_dag_outputs_size = drop_unused_columns_before_array_join_actions_dag_outputs.size();
for (size_t i = 0; i < drop_unused_columns_before_array_join_actions_dag_outputs_size; ++i)
{
const auto & output = drop_unused_columns_before_array_join_actions_dag_outputs[i];
if (drop_unused_columns_before_array_join_actions_dag_updated_outputs_names.contains(output->result_name))
continue;
if (!array_join_expressions_output_nodes.contains(output->result_name) &&
!outer_scope_columns.contains(output->result_name))
continue;
drop_unused_columns_before_array_join_actions_dag_updated_outputs.push_back(output);
drop_unused_columns_before_array_join_actions_dag_updated_outputs_names.insert(output->result_name);
}
drop_unused_columns_before_array_join_actions_dag_outputs = std::move(drop_unused_columns_before_array_join_actions_dag_updated_outputs);
auto drop_unused_columns_before_array_join_transform_step = std::make_unique<ExpressionStep>(plan.getCurrentDataStream(),
std::move(drop_unused_columns_before_array_join_actions_dag));
drop_unused_columns_before_array_join_transform_step->setStepDescription("DROP unused columns before ARRAY JOIN");
plan.addStep(std::move(drop_unused_columns_before_array_join_transform_step));
auto array_join_action = std::make_shared<ArrayJoinAction>(array_join_column_names, array_join_node.isLeft(), planner_context->getQueryContext());
auto array_join_step = std::make_unique<ArrayJoinStep>(plan.getCurrentDataStream(), std::move(array_join_action));
array_join_step->setStepDescription("ARRAY JOIN");
plan.addStep(std::move(array_join_step));
return {std::move(plan), QueryProcessingStage::FetchColumns};
}
}
JoinTreeQueryPlan buildJoinTreeQueryPlan(const QueryTreeNodePtr & query_node,
const SelectQueryInfo & select_query_info,
const SelectQueryOptions & select_query_options,
const ColumnIdentifierSet & outer_scope_columns,
PlannerContextPtr & planner_context)
{
const auto & query_node_typed = query_node->as<QueryNode &>();
auto table_expressions_stack = buildTableExpressionsStack(query_node_typed.getJoinTree());
size_t table_expressions_stack_size = table_expressions_stack.size();
bool is_single_table_expression = table_expressions_stack_size == 1;
std::vector<ColumnIdentifierSet> table_expressions_outer_scope_columns(table_expressions_stack_size);
ColumnIdentifierSet current_outer_scope_columns = outer_scope_columns;
for (Int64 i = static_cast<Int64>(table_expressions_stack_size) - 1; i >= 0; --i)
{
table_expressions_outer_scope_columns[i] = current_outer_scope_columns;
auto & table_expression = table_expressions_stack[i];
auto table_expression_type = table_expression->getNodeType();
if (table_expression_type == QueryTreeNodeType::JOIN)
collectTopLevelColumnIdentifiers(table_expression, planner_context, current_outer_scope_columns);
else if (table_expression_type == QueryTreeNodeType::ARRAY_JOIN)
collectTopLevelColumnIdentifiers(table_expression, planner_context, current_outer_scope_columns);
}
std::vector<JoinTreeQueryPlan> query_plans_stack;
for (size_t i = 0; i < table_expressions_stack_size; ++i)
{
const auto & table_expression = table_expressions_stack[i];
auto table_expression_node_type = table_expression->getNodeType();
if (table_expression_node_type == QueryTreeNodeType::ARRAY_JOIN)
{
if (query_plans_stack.empty())
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Expected at least 1 query plan on stack before ARRAY JOIN processing. Actual {}",
query_plans_stack.size());
auto query_plan = std::move(query_plans_stack.back());
query_plans_stack.back() = buildQueryPlanForArrayJoinNode(table_expression,
std::move(query_plan),
table_expressions_outer_scope_columns[i],
planner_context);
}
else if (table_expression_node_type == QueryTreeNodeType::JOIN)
{
if (query_plans_stack.size() < 2)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Expected at least 2 query plans on stack before JOIN processing. Actual {}",
query_plans_stack.size());
auto right_query_plan = std::move(query_plans_stack.back());
query_plans_stack.pop_back();
auto left_query_plan = std::move(query_plans_stack.back());
query_plans_stack.pop_back();
query_plans_stack.push_back(buildQueryPlanForJoinNode(table_expression,
std::move(left_query_plan),
std::move(right_query_plan),
table_expressions_outer_scope_columns[i],
planner_context));
}
else
{
const auto & table_expression_data = planner_context->getTableExpressionDataOrThrow(table_expression);
if (table_expression_data.isRemote() && i != 0)
throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
"JOIN with multiple remote storages is unsupported");
query_plans_stack.push_back(buildQueryPlanForTableExpression(table_expression,
select_query_info,
select_query_options,
planner_context,
is_single_table_expression));
if (query_plans_stack.back().from_stage != QueryProcessingStage::FetchColumns)
break;
}
}
if (query_plans_stack.size() != 1)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Expected 1 query plan for JOIN TREE. Actual {}",
query_plans_stack.size());
return std::move(query_plans_stack.back());
}
}
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