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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">Ahh ok so example 1 should deliver all subtype1 instances that have subvalue1 <> 100 and all instances of other types, correct?<br> That would require putting negations to atoms and introduce a rule like: "Negated predicates e.g. <b>treat(e as SubType1).subvalue1 <> 100</b> should be rendered like <b>(type(e) not in (SubType1) or subvalue1 <> 100)</b>. Apparently I have forgotten to think about negations.</p> <p style="margin: 10px 0 0">The nullness checks of subtype properties e.g. <b>treat(e as SubType1).subvalue1 is null</b> should be implemented like <b>type(e) = SubType1 and subvalue1 is null</b>? That makes it a bit more complicated as the treat could be somewhere within a more complex expression like in e.g. <b>case when ... then treat(e as SubType1).subvalue1 else treat(e as SubType2).subvalue2 end is null</b> but it should be doable.</p> <p style="margin: 10px 0 0">In the end, your approach to simply translate <b>treat(e as SubType1).subvalue1 OPERATOR ...</b> to <b>type(e) = SubType1 and subvalue1 OPERATOR ...</b> for predicates now makes much more sense. Applying that and then a predicate simplification optimization are probably simpler than my approach.<br> Would you say this behavior should always be like that in all conditional contexts(WHERE, ON, HAVING, condition part of CASE WHEN)?</p> <p style="margin: 10px 0 0">Treats in the SELECT, ORDER BY and GROUP BY clauses could still rely on the NULL value produced by left outer joins and only produce the ugly case when statement for single table inheritance shared columns.</p> </td>
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