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Now generated stored columns are always system versioned. WITH/WITHOUT SYSTEM VERSIONING is not supported for generated columns at parser level:
field_def:
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opt_attribute
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| opt*generated_always AS virtual_column*func
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{
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Lex->last*field->vcol*info= $3;
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Lex->last*field->flags&= ~NOT_NULL*FLAG; // undo automatic NOT NULL for timestamps
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}
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vcol*opt_specifier vcol_opt*attribute
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| opt*generated_always AS ROW_SYM START_SYM opt_asrow*attribute
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{
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if (Lex->last*field_generated_always_as_row*start())
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MYSQL_YYABORT;
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}
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| opt*generated_always AS ROW_SYM END opt_asrow*attribute
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{
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if (Lex->last*field_generated_always_as_row*end())
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MYSQL_YYABORT;
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}
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;
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Better feature would be to detect if all the components of generated stored column are WITHOUT SYSTEM VERSIONING and make it so accordingly. Of course independent WITHOUT SYSTEM VERSIONING for generated stored also makes sense.
Please vote if your production use case will benefit from these features.
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