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MDEV-32578 row_merge_fts_doc_tokenize() handles parser plugin inconsi…
…stently When mysql/mysql-server@0c954c2 added a plugin interface for FULLTEXT INDEX tokenization to MySQL 5.7, fts_tokenize_ctx::processed_len got a second meaning, which is only partly implemented in row_merge_fts_doc_tokenize(). This inconsistency could cause a crash when using FULLTEXT...WITH PARSER. A test case that would crash MySQL 8.0 when using an n-gram parser and single-character words would fail to crash in MySQL 5.7, because the buf_full condition in row_merge_fts_doc_tokenize() was not met. This change is inspired by mysql/mysql-server@38e9a07 that appeared in MySQL 5.7.44.
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