Fix read from Buffer table with empty nested table with different types. #15662
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…d table with different types.
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… table with different types.
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Oct 15, 2020
Backport #15662 to 20.8: Fix read from Buffer table with empty nested table with different types.
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Backport #15662 to 20.9: Fix read from Buffer table with empty nested table with different types.
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Backport #15662 to 20.10: Fix read from Buffer table with empty nested table with different types.
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Backport #15662 to 20.7: Fix read from Buffer table with empty nested table with different types.
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Fix error
Cannot add simple transform to empty Pipewhich happened while reading fromBuffertable which has different structure than destination table. It was possible if destination table returned empty result for query. Fixes #15529