Avoid creating init fork for unlogged indexes when it already exists.
Report by Greg Sabino Mullane, diagnosis and preliminary patch by Andres Freund, corrections by me.
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@ -1741,9 +1741,14 @@ index_build(Relation heapRelation,
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Assert(PointerIsValid(stats));
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/*
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* If this is an unlogged index, we need to write out an init fork for it.
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* If this is an unlogged index, we may need to write out an init fork for
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* it -- but we must first check whether one already exists. If, for
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* example, an unlogged relation is truncated in the transaction that
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* created it, or truncated twice in a subsequent transaction, the
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* relfilenode won't change, and nothing needs to be done here.
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*/
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if (heapRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED)
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if (heapRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED
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&& !smgrexists(indexRelation->rd_smgr, INIT_FORKNUM))
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{
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RegProcedure ambuildempty = indexRelation->rd_am->ambuildempty;
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