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Added comment [#CLICKHOUSE-3901]

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Alexey Milovidov 2018-10-17 00:25:45 +03:00
parent 98543b7c41
commit 7c4d24ce39
1 changed files with 2 additions and 0 deletions
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dbms/src/Storages/MergeTree/MergedBlockOutputStream.h
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@ -156,6 +156,8 @@ class MergedColumnOnlyOutputStream final : public IMergedBlockOutputStream
{
public:
/// skip_offsets: used when ALTERing columns if we know that array offsets are not altered.
/// Pass empty 'already_written_offset_columns' first time then and pass the same object to subsequent instances of MergedColumnOnlyOutputStream
/// if you want to serialize elements of Nested data structure in different instances of MergedColumnOnlyOutputStream.
MergedColumnOnlyOutputStream(
MergeTreeData & storage_, const Block & header_, String part_path_, bool sync_,
CompressionSettings compression_settings, bool skip_offsets_,