8000 Scalar `yield` after singleton record `yield` throws "Conversion to core did not preserve type" · Issue #263 · hydromatic/morel · GitHub
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Scalar yield after singleton record yield throws "Conversion to core did not preserve type" #263

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julianhyde opened this issue May 2, 2025 · 1 comment
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Scalar yield after singleton record yield throws "Conversion to core did not preserve type" #263

julianhyde opened this issue May 2, 2025 · 1 comment

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@julianhyde
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Scalar yield after record yield throws "Conversion to core did not preserve type".

from i in [1, 2, 3, 4, 5, 6],
    j in [1, 2, 3, 4, 5, 6]
  yield {x = i + j}
  yield x;

gives

Conversion to core did not preserve type: expected [int list] actual [{x:int} list] from [from i_8 in [1, 2, 3, 4, 5, 6] join j_8 in [1, 2, 3, 4, 5, 6] yield {x = i_8 + j_8}]

The problem is that FromBuilder thinks the second yield is trivial, and removes it, but actually it affects the result type of the query.
@julianhyde julianhyde changed the title Scalar yield after record yield throws "Conversion to core did not preserve type" Scalar yield after singleton record yield throws "Conversion to core did not preserve type" May 2, 2025
@julianhyde
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Fixed in 5802238. (The commit message erroneously referenced #253.)

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