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#include <Common/typeid_cast.h>
#include <Interpreters/JoinSwitcher.h>
#include <Interpreters/HashJoin.h>
#include <Interpreters/MergeJoin.h>
#include <Interpreters/JoinUtils.h>
namespace DB
{
JoinSwitcher::JoinSwitcher(std::shared_ptr<TableJoin> table_join_, const Block & right_sample_block_)
: limits(table_join_->sizeLimits())
, switched(false)
, table_join(table_join_)
, right_sample_block(right_sample_block_.cloneEmpty())
{
join = std::make_shared<HashJoin>(table_join, right_sample_block);
if (!limits.hasLimits())
limits.max_bytes = table_join->defaultMaxBytes();
}
bool JoinSwitcher::addBlockToJoin(const Block & block, bool)
{
std::lock_guard lock(switch_mutex);
if (switched)
return join->addBlockToJoin(block);
/// HashJoin with external limits check
join->addBlockToJoin(block, false);
size_t rows = join->getTotalRowCount();
size_t bytes = join->getTotalByteCount();
if (!limits.softCheck(rows, bytes))
return switchJoin();
return true;
}
bool JoinSwitcher::switchJoin()
{
HashJoin * hash_join = assert_cast<HashJoin *>(join.get());
BlocksList right_blocks = hash_join->releaseJoinedBlocks(true);
/// Destroy old join & create new one.
join = std::make_shared<MergeJoin>(table_join, right_sample_block);
bool success = true;
for (const Block & saved_block : right_blocks)
success = success && join->addBlockToJoin(saved_block);
switched = true;
return success;
}
}
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