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#pragma once
#include <Core/QueryProcessingStage.h>
#include <Interpreters/IInterpreterUnionOrSelectQuery.h>
namespace DB
{
class InterpreterSelectQuery;
class QueryPlan;
/** Interprets one or multiple SELECT queries inside UNION/UNION ALL/UNION DISTINCT chain.
*/
class InterpreterSelectWithUnionQuery : public IInterpreterUnionOrSelectQuery
{
public:
using IInterpreterUnionOrSelectQuery::getSampleBlock;
InterpreterSelectWithUnionQuery(
const ASTPtr & query_ptr_,
ContextPtr context_,
const SelectQueryOptions &,
const Names & required_result_column_names = {});
InterpreterSelectWithUnionQuery(
const ASTPtr & query_ptr_,
ContextMutablePtr context_,
const SelectQueryOptions &,
const Names & required_result_column_names = {});
~InterpreterSelectWithUnionQuery() override;
/// Builds QueryPlan for current query.
void buildQueryPlan(QueryPlan & query_plan) override;
BlockIO execute() override;
bool ignoreLimits() const override { return options.ignore_limits; }
bool ignoreQuota() const override { return options.ignore_quota; }
static Block getSampleBlock(
const ASTPtr & query_ptr_,
ContextPtr context_,
bool is_subquery = false,
bool is_create_parameterized_view = false);
void ignoreWithTotals() override;
bool supportsTransactions() const override { return true; }
void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr context) const override;
private:
std::vector<std::unique_ptr<IInterpreterUnionOrSelectQuery>> nested_interpreters;
static Block getCommonHeaderForUnion(const Blocks & headers);
Block getCurrentChildResultHeader(const ASTPtr & ast_ptr_, const Names & required_result_column_names);
std::unique_ptr<IInterpreterUnionOrSelectQuery>
buildCurrentChildInterpreter(const ASTPtr & ast_ptr_, const Names & current_required_result_column_names);
};
}
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