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The field fts_token->position is not initialized in row_merge_fts_doc_tokenize(). We cannot have that field without changing the fulltext parser plugin ABI (adding st_mysql_ftparser_boolean_info::position, as it was done in MySQL 5.7 in WL#6943). The InnoDB fulltext parser plugins "ngram" and "Mecab" that were introduced in MySQL 5.7 do depend on that field. But the simple_parser does not. Apparently, simple_parser is leaving the field as 0. So, in our fix we will assume that the missing position field is 0. |
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