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#include <Processors/QueryPlan/Optimizations/Optimizations.h>
#include <Processors/QueryPlan/FilterStep.h>
#include <Processors/QueryPlan/ExpressionStep.h>
#include <Processors/QueryPlan/ArrayJoinStep.h>
#include <Interpreters/ActionsDAG.h>
#include <Interpreters/ArrayJoinAction.h>
namespace DB::QueryPlanOptimizations
{
size_t tryLiftUpArrayJoin(QueryPlan::Node * parent_node, QueryPlan::Nodes & nodes)
{
if (parent_node->children.size() != 1)
return 0;
QueryPlan::Node * child_node = parent_node->children.front();
auto & parent = parent_node->step;
auto & child = child_node->step;
auto * expression_step = typeid_cast<ExpressionStep *>(parent.get());
auto * filter_step = typeid_cast<FilterStep *>(parent.get());
auto * array_join_step = typeid_cast<ArrayJoinStep *>(child.get());
if (!(expression_step || filter_step) || !array_join_step)
return 0;
const auto & array_join = array_join_step->arrayJoin();
const auto & expression = expression_step ? expression_step->getExpression()
: filter_step->getExpression();
auto split_actions = expression->splitActionsBeforeArrayJoin(array_join->columns);
/// No actions can be moved before ARRAY JOIN.
if (split_actions.first->trivial())
return 0;
auto description = parent->getStepDescription();
/// Add new expression step before ARRAY JOIN.
/// Expression/Filter -> ArrayJoin -> Something
auto & node = nodes.emplace_back();
node.children.swap(child_node->children);
child_node->children.emplace_back(&node);
/// Expression/Filter -> ArrayJoin -> node -> Something
node.step = std::make_unique<ExpressionStep>(node.children.at(0)->step->getOutputStream(),
std::move(split_actions.first));
node.step->setStepDescription(description);
array_join_step->updateInputStream(node.step->getOutputStream());
if (expression_step)
parent = std::make_unique<ExpressionStep>(array_join_step->getOutputStream(), split_actions.second);
else
parent = std::make_unique<FilterStep>(array_join_step->getOutputStream(), split_actions.second,
filter_step->getFilterColumnName(), filter_step->removesFilterColumn());
parent->setStepDescription(description + " [split]");
return 3;
}
}
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