Notes on empty user variable identifier allowed (SELECT @) - Githubissues

AnyhowStep / sql-compiler

An experimental SQL compiler

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Notes on empty user variable identifier allowed (SELECT @) #18

Open AnyhowStep opened 3 years ago

AnyhowStep commented 3 years ago

https://github.com/mysql/mysql-server/blob/5c8c085ba96d30d697d0baa54d67b102c232116b/sql/sql_lex.cc#L2082

LEX_HOSTNAME can be an empty string.
LEX_HOSTNAME is a valid ident_or_text https://github.com/mysql/mysql-server/blob/3e90d07c3578e4da39dc1bce73559bbdf655c28c/sql/sql_yacc.yy#L14939
variable_aux allows ident_or_text https://github.com/mysql/mysql-server/blob/3e90d07c3578e4da39dc1bce73559bbdf655c28c/sql/sql_yacc.yy#L11459 Therefore, SELECT @ is valid.