ClickHouse/src/Interpreters/IInterpreterUnionOrSelectQuery.cpp

#include <Interpreters/IInterpreterUnionOrSelectQuery.h>
#include <Interpreters/QueryLog.h>
#include <Processors/QueryPlan/QueryPlan.h>
#include <Processors/QueryPlan/BuildQueryPipelineSettings.h>
#include <Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h>
#include <QueryPipeline/QueryPipelineBuilder.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/parseQuery.h>
#include <Interpreters/ActionsDAG.h>
#include <Interpreters/ExpressionAnalyzer.h>
#include <Interpreters/TreeRewriter.h>
#include <Processors/QueryPlan/FilterStep.h>


namespace DB
{

QueryPipelineBuilder IInterpreterUnionOrSelectQuery::buildQueryPipeline()
{
    QueryPlan query_plan;
    return buildQueryPipeline(query_plan);
}

QueryPipelineBuilder IInterpreterUnionOrSelectQuery::buildQueryPipeline(QueryPlan & query_plan)
{
    buildQueryPlan(query_plan);
    return std::move(*query_plan.buildQueryPipeline(
        QueryPlanOptimizationSettings::fromContext(context), BuildQueryPipelineSettings::fromContext(context)));
}

static StreamLocalLimits getLimitsForStorage(const Settings & settings, const SelectQueryOptions & options)
{
    StreamLocalLimits limits;
    limits.mode = LimitsMode::LIMITS_TOTAL;
    limits.size_limits = SizeLimits(settings.max_rows_to_read, settings.max_bytes_to_read, settings.read_overflow_mode);
    limits.speed_limits.max_execution_time = settings.max_execution_time;
    limits.timeout_overflow_mode = settings.timeout_overflow_mode;

    /** Quota and minimal speed restrictions are checked on the initiating server of the request, and not on remote servers,
      *  because the initiating server has a summary of the execution of the request on all servers.
      *
      * But limits on data size to read and maximum execution time are reasonable to check both on initiator and
      *  additionally on each remote server, because these limits are checked per block of data processed,
      *  and remote servers may process way more blocks of data than are received by initiator.
      *
      * The limits to throttle maximum execution speed is also checked on all servers.
      */
    if (options.to_stage == QueryProcessingStage::Complete)
    {
        limits.speed_limits.min_execution_rps = settings.min_execution_speed;
        limits.speed_limits.min_execution_bps = settings.min_execution_speed_bytes;
    }

    limits.speed_limits.max_execution_rps = settings.max_execution_speed;
    limits.speed_limits.max_execution_bps = settings.max_execution_speed_bytes;
    limits.speed_limits.timeout_before_checking_execution_speed = settings.timeout_before_checking_execution_speed;

    return limits;
}

StorageLimits IInterpreterUnionOrSelectQuery::getStorageLimits(const Context & context, const SelectQueryOptions & options)
{
    const auto & settings = context.getSettingsRef();

    StreamLocalLimits limits;
    SizeLimits leaf_limits;

    /// Set the limits and quota for reading data, the speed and time of the query.
    if (!options.ignore_limits)
    {
        limits = getLimitsForStorage(settings, options);
        leaf_limits = SizeLimits(settings.max_rows_to_read_leaf, settings.max_bytes_to_read_leaf, settings.read_overflow_mode_leaf);
    }

    return {limits, leaf_limits};
}

void IInterpreterUnionOrSelectQuery::setQuota(QueryPipeline & pipeline) const
{
    std::shared_ptr<const EnabledQuota> quota;

    if (!options.ignore_quota && (options.to_stage == QueryProcessingStage::Complete))
        quota = context->getQuota();

    pipeline.setQuota(quota);
}

static ASTPtr parseAdditionalPostFilter(const Context & context)
{
    const auto & settings = context.getSettingsRef();
    const String & filter = settings.additional_result_filter;
    if (filter.empty())
        return nullptr;

    ParserExpression parser;
    return parseQuery(
                parser, filter.data(), filter.data() + filter.size(),
                "additional filter", settings.max_query_size, settings.max_parser_depth);
}

static ActionsDAGPtr makeAdditionalPostFilter(ASTPtr & ast, ContextPtr context, const Block & header)
{
    auto syntax_result = TreeRewriter(context).analyze(ast, header.getNamesAndTypesList());
    String result_column_name = ast->getColumnName();
    auto dag = ExpressionAnalyzer(ast, syntax_result, context).getActionsDAG(false, false);
    const ActionsDAG::Node * result_node = &dag->findInOutputs(result_column_name);
    auto & outputs = dag->getOutputs();
    outputs.clear();
    outputs.reserve(dag->getInputs().size() + 1);
    for (const auto * node : dag->getInputs())
        outputs.push_back(node);

    outputs.push_back(result_node);

    return dag;
}

void IInterpreterUnionOrSelectQuery::addAdditionalPostFilter(QueryPlan & plan) const
{
    if (options.subquery_depth != 0)
        return;

    auto ast = parseAdditionalPostFilter(*context);
    if (!ast)
        return;

    auto dag = makeAdditionalPostFilter(ast, context, plan.getCurrentDataStream().header);
    std::string filter_name = dag->getOutputs().back()->result_name;
    auto filter_step = std::make_unique<FilterStep>(
        plan.getCurrentDataStream(), std::move(dag), std::move(filter_name), true);
    filter_step->setStepDescription("Additional result filter");
    plan.addStep(std::move(filter_step));
}

void IInterpreterUnionOrSelectQuery::addStorageLimits(const StorageLimitsList & limits)
{
    for (const auto & val : limits)
        storage_limits.push_back(val);
}

}