多列指标筛选表格

当列有 子列children时, 会报 You may have an infinite update loop in watcher with expression "columns" 见 https://jsfiddle.net/n8pmq0oe/9/

Start with the linked JSFiddle reproduction and verify the infinite watcher-update error when a table column has children. Trace that scenario into the table implementation and confirm the completed change by reproducing the case without the warning or loop.

Written by the indexing model from the issue text.