datax是否支持同步前的前置判断

我有一个数据同步需求，将先将一个表truncate，再全表同步。
这做这个任务前，需要先对源表做一个判断，比如源表数据量大于一个值，才执行此任务，不符合条件不执行，datax有这个功能么？

The issue asks whether DataX can conditionally run a truncate and full-table synchronization based on the source row count. Start by checking DataX's documented job and task execution features; no file or test is identified in the report. Done would require either confirming existing support or defining a clear implementation scope for conditional execution.

Written by the indexing model from the issue text.