ClickHouse/dbms/Interpreters/InterpreterSelectWithUnionQuery.h

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#pragma once
#include <Core/QueryProcessingStage.h>
#include <Interpreters/Context.h>
#include <Interpreters/IInterpreter.h>
#include <Interpreters/SelectQueryOptions.h>
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#include <Processors/QueryPipeline.h>
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namespace DB
{
class InterpreterSelectQuery;
/** Interprets one or multiple SELECT queries inside UNION ALL chain.
*/
class InterpreterSelectWithUnionQuery : public IInterpreter
{
public:
InterpreterSelectWithUnionQuery(
const ASTPtr & query_ptr_,
const Context & context_,
const SelectQueryOptions &,
const Names & required_result_column_names = {});
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~InterpreterSelectWithUnionQuery() override;
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BlockIO execute() override;
/// Execute the query without union of streams.
BlockInputStreams executeWithMultipleStreams(QueryPipeline & parent_pipeline);
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QueryPipeline executeWithProcessors() override;
bool canExecuteWithProcessors() const override { return true; }
bool ignoreLimits() const override { return options.ignore_limits; }
bool ignoreQuota() const override { return options.ignore_quota; }
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Block getSampleBlock();
static Block getSampleBlock(
const ASTPtr & query_ptr_,
const Context & context_);
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void ignoreWithTotals();
ASTPtr getQuery() const { return query_ptr; }
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private:
SelectQueryOptions options;
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ASTPtr query_ptr;
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std::shared_ptr<Context> context;
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std::vector<std::unique_ptr<InterpreterSelectQuery>> nested_interpreters;
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Block result_header;
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size_t max_streams = 1;
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static Block getCommonHeaderForUnion(const Blocks & headers);
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};
}