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Fix review comments

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This commit is contained in:
Igor Nikonov 2023-02-03 15:12:20 +00:00
parent 7b922784e8
commit 82e50fc211
3 changed files with 30 additions and 33 deletions
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28
src/Interpreters/ActionsDAG.cpp
View File

@ -2260,32 +2260,4 @@ ActionsDAGPtr ActionsDAG::buildFilterActionsDAG(
return result_dag;
}
const ActionsDAG::Node * ActionsDAG::getOriginalNodeForOutputAlias(const String & output_name)
{
/// find alias in output
const Node * output_alias = nullptr;
for (const auto * node : outputs)
{
if (node->result_name == output_name && node->type == ActionsDAG::ActionType::ALIAS)
{
output_alias = node;
break;
}
}
if (!output_alias)
return nullptr;
/// find original(non alias) node it refers to
const Node * node = output_alias;
while (node && node->type == ActionsDAG::ActionType::ALIAS)
{
chassert(!node->children.empty());
node = node->children.front();
}
if (node->type != ActionsDAG::ActionType::INPUT)
return nullptr;
return node;
}
}

3
src/Interpreters/ActionsDAG.h
View File

@ -347,9 +347,6 @@ public:
const std::unordered_map<std::string, ColumnWithTypeAndName> & node_name_to_input_node_column,
const ContextPtr & context);
/// Return original node (input) for alias in output if exists
const Node * getOriginalNodeForOutputAlias(const String & output_name);
private:
NodeRawConstPtrs getParents(const Node * target) const;

32
src/Processors/QueryPlan/Optimizations/removeRedundantDistinct.cpp
View File

@ -37,6 +37,34 @@ namespace
return non_const_columns;
}
const ActionsDAG::Node * getOriginalNodeForOutputAlias(const ActionsDAGPtr & actions, const String & output_name)
{
/// find alias in output
const ActionsDAG::Node * output_alias = nullptr;
for (const auto * node : actions->getOutputs())
{
if (node->result_name == output_name && node->type == ActionsDAG::ActionType::ALIAS)
{
output_alias = node;
break;
}
}
if (!output_alias)
return nullptr;
/// find original(non alias) node it refers to
const ActionsDAG::Node * node = output_alias;
while (node && node->type == ActionsDAG::ActionType::ALIAS)
{
chassert(!node->children.empty());
node = node->children.front();
}
if (node->type != ActionsDAG::ActionType::INPUT)
return nullptr;
return node;
}
bool canRemoveDistinct(const QueryPlan::Node * distinct_node)
{
const DistinctStep * distinct_step = typeid_cast<DistinctStep *>(distinct_node->step.get());
@ -98,7 +126,7 @@ namespace
/// compare columns of two DISTINCTs
for (const auto & column : distinct_columns)
{
const auto * alias_node = path_actions->getOriginalNodeForOutputAlias(String(column));
const auto * alias_node = getOriginalNodeForOutputAlias(path_actions, String(column));
if (!alias_node)
return false;
@ -129,7 +157,7 @@ size_t tryRemoveRedundantDistinct(QueryPlan::Node * parent_node, QueryPlan::Node
for (const auto * node : parent_node->children)
{
/// check if it is distinct node
if (typeid_cast<const DistinctStep *>(node->step.get()))
if (typeid_cast<const DistinctStep *>(node->step.get()) == nullptr)
continue;
if (canRemoveDistinct(node))