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Merge pull request #41122 from lthaooo/optimize_compact_part_mutation

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optimize compact part mutation
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Anton Popov 2022-09-13 14:10:21 +02:00 committed by GitHub
commit 1989380485
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1 changed files with 13 additions and 6 deletions
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19
src/Interpreters/MutationsInterpreter.cpp
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@ -473,6 +473,7 @@ ASTPtr MutationsInterpreter::prepare(bool dry_run)
dependencies = getAllColumnDependencies(metadata_snapshot, updated_columns);
std::vector<String> read_columns;
/// First, break a sequence of commands into stages.
for (auto & command : commands)
{
@ -706,17 +707,23 @@ ASTPtr MutationsInterpreter::prepare(bool dry_run)
else if (command.type == MutationCommand::READ_COLUMN)
{
mutation_kind.set(MutationKind::MUTATE_OTHER);
if (stages.empty() || !stages.back().column_to_updated.empty())
stages.emplace_back(context);
if (stages.size() == 1) /// First stage only supports filtering and can't update columns.
stages.emplace_back(context);
stages.back().column_to_updated.emplace(command.column_name, std::make_shared<ASTIdentifier>(command.column_name));
read_columns.emplace_back(command.column_name);
}
else
throw Exception("Unknown mutation command type: " + DB::toString<int>(command.type), ErrorCodes::UNKNOWN_MUTATION_COMMAND);
}
if (!read_columns.empty())
{
if (stages.empty() || !stages.back().column_to_updated.empty())
stages.emplace_back(context);
if (stages.size() == 1) /// First stage only supports filtering and can't update columns.
stages.emplace_back(context);
for (auto & column_name : read_columns)
stages.back().column_to_updated.emplace(column_name, std::make_shared<ASTIdentifier>(column_name));
}
/// We care about affected indices and projections because we also need to rewrite them
/// when one of index columns updated or filtered with delete.
/// The same about columns, that are needed for calculation of TTL expressions.