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<p style="margin: 10px 0 0 0">As I said in the previous comment, the current problem is in resolving the <tt>Type</tt> for the CASE overall. For example, in the CASE:</p>
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<span class="code-keyword" style="color: #000091">case</span> when someExpression = 'someLiteral' then :someParam <span class="code-keyword" style="color: #000091">else</span> someOtherExpression end
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<p style="margin: 10px 0 0 0">we can interpret the overall Type for the case, because one of the results is Typed (here, the ELSE result). However, when all the possible results are parameters we cannot resolve the Type:</p>
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<span class="code-keyword" style="color: #000091">case</span> when someExpression = 'someLiteral' then :someParam <span class="code-keyword" style="color: #000091">else</span> :anotherParam end
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<p style="margin: 10px 0 0 0">The only solution I can think of for that problem is to require CASTing the parameters:</p>
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<span class="code-keyword" style="color: #000091">case</span> when someExpression = 'someLiteral' then <span class="code-keyword" style="color: #000091">cast</span>( :someParam as <span class="code-object" style="color: #910091">String</span> ) <span class="code-keyword" style="color: #000091">else</span> <span class="code-keyword" style="color: #000091">cast</span>( :anotherParam as <span class="code-object" style="color: #910091">String</span>) end
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<p style="margin: 10px 0 0 0">(at least one of them):</p>
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<span class="code-keyword" style="color: #000091">case</span> when someExpression = 'someLiteral' then <span class="code-keyword" style="color: #000091">cast</span>( :someParam as <span class="code-object" style="color: #910091">String</span> ) <span class="code-keyword" style="color: #000091">else</span> :anotherParam end
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<p style="margin: 10px 0 0 0">or CASTing the CASE statement overall:</p>
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<span class="code-keyword" style="color: #000091">cast</span>( <span class="code-keyword" style="color: #000091">case</span> when someExpression = 'someLiteral' then :someParam <span class="code-keyword" style="color: #000091">else</span> :anotherParam end as <span class="code-object" style="color: #910091">String</span> )
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<p style="margin: 10px 0 0 0">BTW, the query in the original report is not conceptually valid since it gives no ELSE result.</p>
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