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af33039317
TupleQueueReaderNext() leaks like a sieve if it has to do any tuple disassembly/reconstruction. While we could try to clean up its allocations piecemeal, it seems like a better idea just to insist that it should be run in a short-lived memory context, so that any transient space goes away automatically. I chose to have nodeGather.c switch into its existing per-tuple context before the call, rather than inventing a separate context inside tqueue.c. This is sufficient to stop all leakage in the simple case I exhibited earlier today (see link below), but it does not deal with leaks induced in more complex cases by tqueue.c's insistence on using TopMemoryContext for data that it's not actually trying hard to keep track of. That issue is intertwined with another major source of inefficiency, namely failure to cache lookup results across calls, so it seems best to deal with it separately. In passing, improve some comments, and modify gather_readnext's method for deciding when it's visited all the readers so that it's more obviously correct. (I'm not actually convinced that the previous code *is* correct in the case of a reader deletion; it certainly seems fragile.) Discussion: <32763.1469821037@sss.pgh.pa.us> |
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| .. | ||
| execdebug.h | ||
| execdesc.h | ||
| execParallel.h | ||
| executor.h | ||
| functions.h | ||
| hashjoin.h | ||
| instrument.h | ||
| nodeAgg.h | ||
| nodeAppend.h | ||
| nodeBitmapAnd.h | ||
| nodeBitmapHeapscan.h | ||
| nodeBitmapIndexscan.h | ||
| nodeBitmapOr.h | ||
| nodeCtescan.h | ||
| nodeCustom.h | ||
| nodeForeignscan.h | ||
| nodeFunctionscan.h | ||
| nodeGather.h | ||
| nodeGroup.h | ||
| nodeHash.h | ||
| nodeHashjoin.h | ||
| nodeIndexonlyscan.h | ||
| nodeIndexscan.h | ||
| nodeLimit.h | ||
| nodeLockRows.h | ||
| nodeMaterial.h | ||
| nodeMergeAppend.h | ||
| nodeMergejoin.h | ||
| nodeModifyTable.h | ||
| nodeNestloop.h | ||
| nodeRecursiveunion.h | ||
| nodeResult.h | ||
| nodeSamplescan.h | ||
| nodeSeqscan.h | ||
| nodeSetOp.h | ||
| nodeSort.h | ||
| nodeSubplan.h | ||
| nodeSubqueryscan.h | ||
| nodeTidscan.h | ||
| nodeUnique.h | ||
| nodeValuesscan.h | ||
| nodeWindowAgg.h | ||
| nodeWorktablescan.h | ||
| spi.h | ||
| spi_priv.h | ||
| tqueue.h | ||
| tstoreReceiver.h | ||
| tuptable.h | ||