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98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
#pragma once
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#include <Common/typeid_cast.h>
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#include <DataTypes/IDataType.h>
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#include <Columns/IColumn.h>
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#include <Columns/ColumnConst.h>
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#include <Core/Block.h>
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#include <Core/ColumnNumbers.h>
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#include <Core/callOnTypeIndex.h>
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namespace DB
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{
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/// Methods, that helps dispatching over real column types.
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template <typename Type>
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const Type * checkAndGetDataType(const IDataType * data_type)
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{
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return typeid_cast<const Type *>(data_type);
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}
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template <typename Type>
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const Type * checkAndGetColumn(const IColumn * column)
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{
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return typeid_cast<const Type *>(column);
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}
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template <typename Type>
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bool checkColumn(const IColumn * column)
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{
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return checkAndGetColumn<Type>(column);
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}
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template <typename Type>
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const ColumnConst * checkAndGetColumnConst(const IColumn * column)
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{
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if (!column || !column->isColumnConst())
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return {};
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const ColumnConst * res = static_cast<const ColumnConst *>(column);
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if (!checkColumn<Type>(&res->getDataColumn()))
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return {};
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return res;
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}
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template <typename Type>
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const Type * checkAndGetColumnConstData(const IColumn * column)
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{
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const ColumnConst * res = checkAndGetColumnConst<Type>(column);
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if (!res)
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return {};
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return static_cast<const Type *>(&res->getDataColumn());
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}
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template <typename Type>
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bool checkColumnConst(const IColumn * column)
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{
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return checkAndGetColumnConst<Type>(column);
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}
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/// Returns non-nullptr if column is ColumnConst with ColumnString or ColumnFixedString inside.
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const ColumnConst * checkAndGetColumnConstStringOrFixedString(const IColumn * column);
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/// Transform anything to Field.
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template <typename T>
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inline std::enable_if_t<!IsDecimalNumber<T>, Field> toField(const T & x)
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{
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return Field(NearestFieldType<T>(x));
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}
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template <typename T>
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inline std::enable_if_t<IsDecimalNumber<T>, Field> toField(const T & x, UInt32 scale)
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{
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return Field(NearestFieldType<T>(x, scale));
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}
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Columns convertConstTupleToConstantElements(const ColumnConst & column);
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/// Returns the copy of a given block in which each column specified in
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/// the "arguments" parameter is replaced with its respective nested
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/// column if it is nullable.
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Block createBlockWithNestedColumns(const Block & block, const ColumnNumbers & args);
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/// Similar function as above. Additionally transform the result type if needed.
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Block createBlockWithNestedColumns(const Block & block, const ColumnNumbers & args, size_t result);
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}
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