系统。合并

• (String) — The name of the database the table is in.
• table (String) — Table name.
• elapsed (Float64) — The time elapsed (in seconds) since the merge started.
• (UInt64) — The number of pieces to be merged.
• result_part_name (String) — The name of the part that will be formed as the result of merging.
• is_mutation (UInt8)-1如果这个过程是一个部分突变.
• (UInt64) — The total number of marks in the merged parts.
• bytes_read_uncompressed (UInt64) — Number of bytes read, uncompressed.
• rows_read (UInt64) — Number of rows read.
• (UInt64) — Number of rows written.