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58 lines
2.5 KiB
C++
58 lines
2.5 KiB
C++
#pragma once
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#include <type_traits>
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnsNumber.h>
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#include "IValueSource.h"
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#include "IArraySource.h"
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#include "IArraySink.h"
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/** These methods are intended for implementation of functions, that
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* copy ranges from one or more columns to another column.
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*
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* Example:
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* - concatenation of strings and arrays (concat);
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* - extracting slices and elements of strings and arrays (substring, arraySlice, arrayElement);
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* - creating arrays from several columns ([x, y]);
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* - conditional selecting from several string or array columns (if, multiIf);
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* - push and pop elements from array front or back (arrayPushBack, etc);
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* - splitting strings into arrays and joining arrays back;
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* - formatting strings (format).
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*
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* There are various Sources, Sinks and Slices.
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* Source - allows to iterate over a column and obtain Slices.
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* Slice - a reference to elements to copy.
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* Sink - allows to build result column by copying Slices into it.
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*/
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namespace DB::GatherUtils
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{
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std::unique_ptr<IArraySource> createArraySource(const ColumnArray & col, bool is_const, size_t total_rows);
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std::unique_ptr<IValueSource> createValueSource(const IColumn & col, bool is_const, size_t total_rows);
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std::unique_ptr<IArraySink> createArraySink(ColumnArray & col, size_t column_size);
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void concat(const std::vector<std::unique_ptr<IArraySource>> & sources, IArraySink & sink);
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void sliceFromLeftConstantOffsetUnbounded(IArraySource & src, IArraySink & sink, size_t offset);
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void sliceFromLeftConstantOffsetBounded(IArraySource & src, IArraySink & sink, size_t offset, ssize_t length);
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void sliceFromRightConstantOffsetUnbounded(IArraySource & src, IArraySink & sink, size_t offset);
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void sliceFromRightConstantOffsetBounded(IArraySource & src, IArraySink & sink, size_t offset, ssize_t length);
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void sliceDynamicOffsetUnbounded(IArraySource & src, IArraySink & sink, const IColumn & offset_column);
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void sliceDynamicOffsetBounded(IArraySource & src, IArraySink & sink, const IColumn & offset_column, const IColumn & length_column);
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void sliceHas(IArraySource & first, IArraySource & second, bool all, ColumnUInt8 & result);
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void push(IArraySource & array_source, IValueSource & value_source, IArraySink & sink, bool push_front);
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void resizeDynamicSize(IArraySource & array_source, IValueSource & value_source, IArraySink & sink, const IColumn & size_column);
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void resizeConstantSize(IArraySource & array_source, IValueSource & value_source, IArraySink & sink, ssize_t size);
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}
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