ClickHouse/dbms/Interpreters/SelectQueryOptions.h

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#pragma once
#include <Core/QueryProcessingStage.h>
namespace DB
{
/**
* to_stage
* - the stage to which the query is to be executed. By default - till to the end.
* You can perform till the intermediate aggregation state, which are combined from different servers for distributed query processing.
*
* subquery_depth
* - to control the limit on the depth of nesting of subqueries. For subqueries, a value that is incremented by one is passed;
* for INSERT SELECT, a value 1 is passed instead of 0.
*
* only_analyze
* - the object was created only for query analysis.
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*
* is_subquery
* - there could be some specific for subqueries. Ex. there's no need to pass duplicated columns in results, cause of indirect results.
*/
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struct SelectQueryOptions
{
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QueryProcessingStage::Enum to_stage;
size_t subquery_depth;
bool only_analyze = false;
bool modify_inplace = false;
bool remove_duplicates = false;
bool ignore_quota = false;
bool ignore_limits = false;
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SelectQueryOptions(QueryProcessingStage::Enum stage = QueryProcessingStage::Complete, size_t depth = 0)
: to_stage(stage), subquery_depth(depth)
{
}
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SelectQueryOptions copy() const { return *this; }
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SelectQueryOptions subquery() const
{
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SelectQueryOptions out = *this;
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out.to_stage = QueryProcessingStage::Complete;
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++out.subquery_depth;
return out;
}
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SelectQueryOptions & analyze(bool dry_run = true)
{
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only_analyze = dry_run;
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return *this;
}
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SelectQueryOptions & modify(bool value = true)
{
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modify_inplace = value;
return *this;
}
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SelectQueryOptions & noModify() { return modify(false); }
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SelectQueryOptions & removeDuplicates(bool value = true)
{
remove_duplicates = value;
return *this;
}
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SelectQueryOptions & noSubquery()
{
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subquery_depth = 0;
return *this;
}
SelectQueryOptions & ignoreLimits(bool value = true)
{
ignore_limits = value;
return *this;
}
};
}