mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 17:32:32 +00:00
196 lines
6.3 KiB
C++
196 lines
6.3 KiB
C++
#pragma once
|
|
|
|
#include <shared_mutex>
|
|
#include <Core/Block.h>
|
|
#include <DataStreams/SizeLimits.h>
|
|
#include <DataTypes/IDataType.h>
|
|
#include <Interpreters/SetVariants.h>
|
|
#include <Interpreters/Context.h>
|
|
#include <Parsers/IAST.h>
|
|
#include <Storages/MergeTree/BoolMask.h>
|
|
|
|
#include <common/logger_useful.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
struct Range;
|
|
class FieldWithInfinity;
|
|
|
|
class IFunctionBase;
|
|
using FunctionBasePtr = std::shared_ptr<IFunctionBase>;
|
|
|
|
|
|
/** Data structure for implementation of IN expression.
|
|
*/
|
|
class Set
|
|
{
|
|
public:
|
|
/// 'fill_set_elements': in addition to hash table
|
|
/// (that is useful only for checking that some value is in the set and may not store the original values),
|
|
/// store all set elements in explicit form.
|
|
/// This is needed for subsequent use for index.
|
|
Set(const SizeLimits & limits, bool fill_set_elements)
|
|
: log(&Logger::get("Set")),
|
|
limits(limits), fill_set_elements(fill_set_elements)
|
|
{
|
|
}
|
|
|
|
bool empty() const { return data.empty(); }
|
|
|
|
/** Set can be created either from AST or from a stream of data (subquery result).
|
|
*/
|
|
|
|
/** Create a Set from expression (specified literally in the query).
|
|
* 'types' - types of what are on the left hand side of IN.
|
|
* 'node' - list of values: 1, 2, 3 or list of tuples: (1, 2), (3, 4), (5, 6).
|
|
* 'fill_set_elements' - if true, fill vector of elements. For primary key to work.
|
|
*/
|
|
void createFromAST(const DataTypes & types, ASTPtr node, const Context & context);
|
|
|
|
/** Create a Set from stream.
|
|
* Call setHeader, then call insertFromBlock for each block.
|
|
*/
|
|
void setHeader(const Block & header);
|
|
|
|
/// Returns false, if some limit was exceeded and no need to insert more data.
|
|
bool insertFromBlock(const Block & block);
|
|
|
|
/** For columns of 'block', check belonging of corresponding rows to the set.
|
|
* Return UInt8 column with the result.
|
|
*/
|
|
ColumnPtr execute(const Block & block, bool negative) const;
|
|
|
|
size_t getTotalRowCount() const { return data.getTotalRowCount(); }
|
|
size_t getTotalByteCount() const { return data.getTotalByteCount(); }
|
|
|
|
const DataTypes & getDataTypes() const { return data_types; }
|
|
|
|
bool hasExplicitSetElements() const { return fill_set_elements; }
|
|
Columns getSetElements() const { return { set_elements.begin(), set_elements.end() }; }
|
|
|
|
private:
|
|
size_t keys_size = 0;
|
|
Sizes key_sizes;
|
|
|
|
SetVariants data;
|
|
|
|
/** How IN works with Nullable types.
|
|
*
|
|
* For simplicity reasons, all NULL values and any tuples with at least one NULL element are ignored in the Set.
|
|
* And for left hand side values, that are NULLs or contain any NULLs, we return 0 (means that element is not in Set).
|
|
*
|
|
* If we want more standard compliant behaviour, we must return NULL
|
|
* if lhs is NULL and set is not empty or if lhs is not in set, but set contains at least one NULL.
|
|
* It is more complicated with tuples.
|
|
* For example,
|
|
* (1, NULL, 2) IN ((1, NULL, 3)) must return 0,
|
|
* but (1, NULL, 2) IN ((1, 1111, 2)) must return NULL.
|
|
*
|
|
* We have not implemented such sophisticated behaviour.
|
|
*/
|
|
|
|
/** The data types from which the set was created.
|
|
* When checking for belonging to a set, the types of columns to be checked must match with them.
|
|
*/
|
|
DataTypes data_types;
|
|
|
|
Logger * log;
|
|
|
|
/// Limitations on the maximum size of the set
|
|
SizeLimits limits;
|
|
|
|
/// Do we need to additionally store all elements of the set in explicit form for subsequent use for index.
|
|
bool fill_set_elements;
|
|
|
|
/// If in the left part columns contains the same types as the elements of the set.
|
|
void executeOrdinary(
|
|
const ColumnRawPtrs & key_columns,
|
|
ColumnUInt8::Container & vec_res,
|
|
bool negative,
|
|
const PaddedPODArray<UInt8> * null_map) const;
|
|
|
|
/// Collected elements of `Set`.
|
|
/// It is necessary for the index to work on the primary key in the IN statement.
|
|
std::vector<IColumn::WrappedPtr> set_elements;
|
|
|
|
/** Protects work with the set in the functions `insertFromBlock` and `execute`.
|
|
* These functions can be called simultaneously from different threads only when using StorageSet,
|
|
* and StorageSet calls only these two functions.
|
|
* Therefore, the rest of the functions for working with set are not protected.
|
|
*/
|
|
mutable std::shared_mutex rwlock;
|
|
|
|
template <typename Method>
|
|
void insertFromBlockImpl(
|
|
Method & method,
|
|
const ColumnRawPtrs & key_columns,
|
|
size_t rows,
|
|
SetVariants & variants,
|
|
ConstNullMapPtr null_map,
|
|
ColumnUInt8::Container * out_filter);
|
|
|
|
template <typename Method, bool has_null_map, bool build_filter>
|
|
void insertFromBlockImplCase(
|
|
Method & method,
|
|
const ColumnRawPtrs & key_columns,
|
|
size_t rows,
|
|
SetVariants & variants,
|
|
ConstNullMapPtr null_map,
|
|
ColumnUInt8::Container * out_filter);
|
|
|
|
template <typename Method>
|
|
void executeImpl(
|
|
Method & method,
|
|
const ColumnRawPtrs & key_columns,
|
|
ColumnUInt8::Container & vec_res,
|
|
bool negative,
|
|
size_t rows,
|
|
ConstNullMapPtr null_map) const;
|
|
|
|
template <typename Method, bool has_null_map>
|
|
void executeImplCase(
|
|
Method & method,
|
|
const ColumnRawPtrs & key_columns,
|
|
ColumnUInt8::Container & vec_res,
|
|
bool negative,
|
|
size_t rows,
|
|
ConstNullMapPtr null_map) const;
|
|
};
|
|
|
|
using SetPtr = std::shared_ptr<Set>;
|
|
using ConstSetPtr = std::shared_ptr<const Set>;
|
|
using Sets = std::vector<SetPtr>;
|
|
|
|
|
|
class IFunction;
|
|
using FunctionPtr = std::shared_ptr<IFunction>;
|
|
|
|
/// Class for checkInRange function.
|
|
class MergeTreeSetIndex
|
|
{
|
|
public:
|
|
/** Mapping for tuple positions from Set::set_elements to
|
|
* position of pk index and functions chain applied to this column.
|
|
*/
|
|
struct KeyTuplePositionMapping
|
|
{
|
|
size_t tuple_index;
|
|
size_t key_index;
|
|
std::vector<FunctionBasePtr> functions;
|
|
};
|
|
|
|
MergeTreeSetIndex(const Columns & set_elements, std::vector<KeyTuplePositionMapping> && indexes_mapping_);
|
|
|
|
size_t size() const { return ordered_set.at(0)->size(); }
|
|
|
|
BoolMask checkInRange(const std::vector<Range> & key_ranges, const DataTypes & data_types);
|
|
|
|
private:
|
|
Columns ordered_set;
|
|
std::vector<KeyTuplePositionMapping> indexes_mapping;
|
|
};
|
|
|
|
}
|