pkg/planner, pkg/sessionctx: keep native TiCI FTS plan when LIKE fallback rejects syntax | tidb-test=feature/fts tiflash=feature/fts tikv=feature/fts#68525

Merged

winoros merged 8 commits into

pingcap:feature/ftsfrom

AilinKid:codex/fts-keep-native-fallback-fix

May 21, 2026