By filtering tuple record values using a predefined conditional expression, you can select the tuples to be held by the timestamp adjustment function, thereby reducing the number of tuples to be placed on hold.
You use the stream.filterMode parameter in the query group property file or stream property file to specify whether or not tuples are to be filtered by the timestamp adjustment function. A conditional expression for filtering is specified in the stream.filterCondition parameter. For details about the stream.filterMode and stream.filterCondition parameters, see 8.6 System configuration property file (system_config.properties).