Allow empty inline collections #32414
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maumar
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Fixes dotnet#32375 (cherry picked from commit 01a470c)
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Fixes #32375
We translate inline query roots to SQL VALUES, which doesn't support empty sets (there must be at least one element); so we had an early check to detect this and throw an informative exception.
However, in the Contains case, we pattern-match the ValuesExpression and optimize it away to an InExpression, so no actual VALUES gets sent to the database. This PR removes the check - allowing ValuesExpression to get get converted to InExpression - and moves the check for empty ValuesExpression to the SQL generation phase.