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47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#pragma once
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#include <Core/Types.h>
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namespace DB
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{
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class ReadBuffer;
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class WriteBuffer;
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/** More information about the block.
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*/
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struct BlockInfo
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{
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/** is_overflows:
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* After running GROUP BY ... WITH TOTALS with the max_rows_to_group_by and group_by_overflow_mode = 'any' settings,
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* a row is inserted in the separate block with aggregated values that have not passed max_rows_to_group_by.
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* If it is such a block, then is_overflows is set to true for it.
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*/
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/** bucket_num:
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* When using the two-level aggregation method, data with different key groups are scattered across different buckets.
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* In this case, the bucket number is indicated here. It is used to optimize the merge for distributed aggregation.
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* Otherwise -1.
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*/
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#define APPLY_FOR_BLOCK_INFO_FIELDS(M) \
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M(bool, is_overflows, false, 1) \
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M(Int32, bucket_num, -1, 2)
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#define DECLARE_FIELD(TYPE, NAME, DEFAULT, FIELD_NUM) \
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TYPE NAME = DEFAULT;
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APPLY_FOR_BLOCK_INFO_FIELDS(DECLARE_FIELD)
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#undef DECLARE_FIELD
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/// Write the values in binary form. NOTE: You could use protobuf, but it would be overkill for this case.
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void write(WriteBuffer & out) const;
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/// Read the values in binary form.
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void read(ReadBuffer & in);
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};
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}
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