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Commit6e481eb

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Improve error message when an FDW doesn't support WHERE CURRENT OF.
If an FDW fails to take special measures with a CurrentOfExpr, we willend up trying to execute it as an ordinary qual, which was being treatedas a purely internal failure condition. Provide a more user-orientederror message for such cases.
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‎src/backend/executor/execQual.c‎

Lines changed: 8 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4257,16 +4257,20 @@ ExecEvalArrayCoerceExpr(ArrayCoerceExprState *astate,
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/* ----------------------------------------------------------------
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*ExecEvalCurrentOfExpr
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*
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* The planner must convert CURRENT OF into a TidScan qualification.
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* So, we have to be able to do ExecInitExpr on a CurrentOfExpr,
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* but we shouldn't ever actually execute it.
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* The planner should convert CURRENT OF into a TidScan qualification, or some
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* other special handling in a ForeignScan node. So we have to be able to do
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* ExecInitExpr on a CurrentOfExpr, but we shouldn't ever actually execute it.
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* If we get here, we suppose we must be dealing with CURRENT OF on a foreign
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* table whose FDW doesn't handle it, and complain accordingly.
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* ----------------------------------------------------------------
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*/
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staticDatum
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ExecEvalCurrentOfExpr(ExprState*exprstate,ExprContext*econtext,
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bool*isNull,ExprDoneCond*isDone)
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{
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elog(ERROR,"CURRENT OF cannot be executed");
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("WHERE CURRENT OF is not supported for this table type")));
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return0;/* keep compiler quiet */
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}
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