GetAllTables holds all tables' Definition which should be handled in ETLMerge.

JsonField will have same effect as StringField.

NewETLPath path like: sys/[log|merged]/yyyy/mm/dd/table/***.csv ## idx: 0 1 2 3 4 5 6 filename like: {timestamp}_{node_uuid}_{node_type}.csv ## or: {timestamp_start}_{timestamp_end}_merged.csv.

RegisterTableDefine return old one, if already registered.

SetPathBuilder Deprecated.

Time2DatetimeBuffed output datetime string to buffer len(buf) should >= max(64, len(timestampFormatter) + 10).

only used in ColumnField.

only used in ColumnField.

ExternalTableEngine Deprecated.

AfterWrite cooperate with RowWriter.

NeedCheckWrite cooperate with AfterWrite and RowField.

PathBuilder hold strategy to build filepath.