Condition specifies the row judgment conditions in PutRow, UpdateRow, and DeleteRow. It currently contains row_existence and column_condition.
Data structure
message Condition {required RowExistenceExpectation row_existence = 1;optional bytes column_condition = 2;}
row_existence:
Type: RowExistenceExpectation
The row existence check settings for this row.
column_condition:
Type: Bytes
The column condition settings. It indicates the bytes after the Filter is serialized in Protobuf format.