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Keep original order of conditions during move to prewhere

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avogar 2024-09-12 14:51:59 +00:00
parent a7d0a5991e
commit beffb92411
1 changed files with 19 additions and 2 deletions
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21
src/Storages/MergeTree/MergeTreeWhereOptimizer.cpp
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@ -361,11 +361,23 @@ std::optional<MergeTreeWhereOptimizer::OptimizeResult> MergeTreeWhereOptimizer::
UInt64 total_size_of_moved_conditions = 0;
UInt64 total_number_of_moved_columns = 0;
/// Remember positions of conditions in where_conditions list
/// to keep original order of conditions in prewhere_conditions while moving.
std::unordered_map<const Condition *, size_t> condition_positions;
size_t position= 0;
for (const auto & condition : where_conditions)
condition_positions[&condition] = position++;
/// Move condition and all other conditions depend on the same set of columns.
auto move_condition = [&](Conditions::iterator cond_it)
{
LOG_TRACE(log, "Condition {} moved to PREWHERE", cond_it->node.getColumnName());
prewhere_conditions.splice(prewhere_conditions.end(), where_conditions, cond_it);
/// Keep the original order of conditions in prewhere_conditions.
position = condition_positions[&(*cond_it)];
auto prewhere_it = prewhere_conditions.begin();
while (condition_positions[&(*prewhere_it)] < position && prewhere_it != prewhere_conditions.end())
++prewhere_it;
prewhere_conditions.splice(prewhere_it, where_conditions, cond_it);
total_size_of_moved_conditions += cond_it->columns_size;
total_number_of_moved_columns += cond_it->table_columns.size();
@ -375,7 +387,12 @@ std::optional<MergeTreeWhereOptimizer::OptimizeResult> MergeTreeWhereOptimizer::
if (jt->viable && jt->columns_size == cond_it->columns_size && jt->table_columns == cond_it->table_columns)
{
LOG_TRACE(log, "Condition {} moved to PREWHERE", jt->node.getColumnName());
prewhere_conditions.splice(prewhere_conditions.end(), where_conditions, jt++);
/// Keep the original order of conditions in prewhere_conditions.
position = condition_positions[&(*jt)];
prewhere_it = prewhere_conditions.begin();
while (condition_positions[&(*prewhere_it)] < position && prewhere_it != prewhere_conditions.end())
++prewhere_it;
prewhere_conditions.splice(prewhere_it, where_conditions, jt++);
}
else
{