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Add brief comment for MergeTreeSequentialSource
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
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@ -20,7 +20,9 @@ namespace ErrorCodes
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}
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/// Lightweight (in terms of logic) stream for reading single part from MergeTree
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/// Lightweight (in terms of logic) stream for reading single part from
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/// MergeTree, used for merges and mutations.
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///
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/// NOTE:
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/// It doesn't filter out rows that are deleted with lightweight deletes.
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/// Use createMergeTreeSequentialSource filter out those rows.
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