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#include <Common/SettingsChanges.h>
#include <Parsers/QueryWithOutputSettingsPushDownVisitor.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Parsers/ASTSelectQuery.h>
#include <Parsers/ASTSetQuery.h>
#include <Parsers/ASTSubquery.h>
#include <iterator>
#include <algorithm>
namespace DB
{
bool QueryWithOutputSettingsPushDownMatcher::needChildVisit(ASTPtr & node, const ASTPtr & child)
{
if (node->as<ASTSelectWithUnionQuery>())
return true;
if (node->as<ASTSubquery>())
return true;
if (child->as<ASTSelectQuery>())
return true;
return false;
}
void QueryWithOutputSettingsPushDownMatcher::visit(ASTPtr & ast, Data & data)
{
if (auto * select_query = ast->as<ASTSelectQuery>())
visit(*select_query, ast, data);
}
void QueryWithOutputSettingsPushDownMatcher::visit(ASTSelectQuery & select_query, ASTPtr &, Data & data)
{
ASTPtr select_settings_ast = select_query.settings();
if (!select_settings_ast)
{
select_query.setExpression(ASTSelectQuery::Expression::SETTINGS, data.settings_ast->clone());
return;
}
SettingsChanges & select_settings = select_settings_ast->as<ASTSetQuery &>().changes;
SettingsChanges & settings = data.settings_ast->as<ASTSetQuery &>().changes;
for (auto & setting : settings)
{
auto it = std::find_if(select_settings.begin(), select_settings.end(), [&](auto & select_setting)
{
return select_setting.name == setting.name;
});
if (it == select_settings.end())
select_settings.push_back(setting);
else
it->value = setting.value;
}
}
}
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