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If the variable's value is null, exec_stmt_return() missed filling in estate->rettype. This is a pretty old bug, but we'd managed not to notice because that value isn't consulted for a null result ... unless we have to cast it to a domain. That case led to a failure with "cache lookup failed for type 0". The correct way to assign the data type is known by exec_eval_datum. While we could copy-and-paste that logic, it seems like a better idea to just invoke exec_eval_datum, as the ROW case already does. Reported-by: Pavel Stehule <pavel.stehule@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAFj8pRBT_ahexDf-zT-cyH8bMR_qcySKM8D5nv5MvTWPiatYGA@mail.gmail.com Backpatch-through: 14 |
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