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* Update copyright for 2025Bruce Momjian2025-01-01
| | | | Backpatch-through: 13
* Remove useless casts to (void *)Peter Eisentraut2024-11-28
| | | | | | | | Many of them just seem to have been copied around for no real reason. Their presence causes (small) risks of hiding actual type mismatches or silently discarding qualifiers Discussion: https://www.postgresql.org/message-id/flat/461ea37c-8b58-43b4-9736-52884e862820@eisentraut.org
* Update copyright for 2024Bruce Momjian2024-01-03
| | | | | | | | Reported-by: Michael Paquier Discussion: https://postgr.es/m/ZZKTDPxBBMt3C0J9@paquier.xyz Backpatch-through: 12
* Remove obsolete executor cleanup codeAmit Langote2023-09-28
| | | | | | | | | | | | | | | | | | | This commit removes unnecessary ExecExprFreeContext() calls in ExecEnd* routines because the actual cleanup is managed by FreeExecutorState(). With no callers remaining for ExecExprFreeContext(), this commit also removes the function. This commit also drops redundant ExecClearTuple() calls, because ExecResetTupleTable() in ExecEndPlan() already takes care of resetting and dropping all TupleTableSlots initialized with ExecInitScanTupleSlot() and ExecInitExtraTupleSlot(). After these modifications, the ExecEnd*() routines for ValuesScan, NamedTuplestoreScan, and WorkTableScan became redundant. So, this commit removes them. Reviewed-by: Robert Haas Discussion: https://postgr.es/m/CA+HiwqFGkMSge6TgC9KQzde0ohpAycLQuV7ooitEEpbKB0O_mg@mail.gmail.com
* Update copyright for 2023Bruce Momjian2023-01-02
| | | | Backpatch-through: 11
* Allow nodeSort to perform Datum sorts for byref typesDavid Rowley2022-10-28
| | | | | | | | | | | | | | | | | | | | | | | | Here we add a new 'copy' parameter to tuplesort_getdatum so that we can instruct the function not to datumCopy() byref Datums before returning. Similar to 91e9e89dc, this can provide significant performance improvements in nodeSort when sorting by a single byref column and the sort's targetlist contains only that column. This allows us to re-enable Datum sorts for byref types which was disabled in 3a5817695 due to a reported memory leak. Additionally, here we slightly optimize DISTINCT aggregates so that we no longer perform any datumCopy() when we find the current value not to be distinct from the previous value. Previously the code would always take a copy of the most recent Datum and pfree the previous value, even when the values were the same. Testing shows a small but noticeable performance increase when aggregate transitions are skipped due to the current transition value being the same as the prior one. Author: David Rowley Discussion: https://postgr.es/m/CAApHDvqS6wC5U==k9Hd26E4EQXH3QR67-T4=Q1rQ36NGvjfVSg@mail.gmail.com Discussion: https://postgr.es/m/CAApHDvqHonfe9G1cVaKeHbDx70R_zCrM3qP2AGXpGrieSKGnhA@mail.gmail.com
* Restrict Datum sort optimization to byval types onlyDavid Rowley2022-09-29
| | | | | | | | | | | | | | | | | | | 91e9e89dc modified nodeSort.c so that it used datum sorts when the targetlist of the outer node contained only a single column. That commit failed to recognise that the Datum returned by tuplesort_getdatum() must be pfree'd when the type is a byref type. Ronan Dunklau did originally propose the patch with that restriction, but that, probably through my own fault, got lost during further development work. Due to the timing of this report (PG15 RC1 is almost out the door), let's just restrict the datum sort optimization to apply for byval types only. We might want to look harder into making this work for byref types in PG16. Reported-by: Önder Kalacı Diagnosis-by: Tom Lane Discussion: https://postgr.es/m/CACawEhVxe0ufR26UcqtU7GYGRuubq3p6ZWPGXL4cxy_uexpAAQ@mail.gmail.com Backpatch-through: 15, where 91e9e89dc was introduced.
* Use Generation memory contexts to store tuples in sortsDavid Rowley2022-04-04
| | | | | | | | | | | | | | | | | | | | | | | | | | The general usage pattern when we store tuples in tuplesort.c is that we store a series of tuples one by one then either perform a sort or spill them to disk. In the common case, there is no pfreeing of already stored tuples. For the common case since we do not individually pfree tuples, we have very little need for aset.c memory allocation behavior which maintains freelists and always rounds allocation sizes up to the next power of 2 size. Here we conditionally use generation.c contexts for storing tuples in tuplesort.c when the sort will never be bounded. Unfortunately, the memory context to store tuples is already created by the time any calls would be made to tuplesort_set_bound(), so here we add a new sort option that allows callers to specify if they're going to need a bounded sort or not. We'll use a standard aset.c allocator when this sort option is not set. Extension authors must ensure that the TUPLESORT_ALLOWBOUNDED flag is used when calling tuplesort_begin_* for any sorts that make a call to tuplesort_set_bound(). Author: David Rowley Reviewed-by: Andy Fan Discussion: https://postgr.es/m/CAApHDvoH4ASzsAOyHcxkuY01Qf++8JJ0paw+03dk+W25tQEcNQ@mail.gmail.com
* Adjust tuplesort API to have bitwise option flagsDavid Rowley2022-04-04
| | | | | | | | | | | | | | | | This replaces the bool flag for randomAccess. An upcoming patch requires adding another option, so instead of breaking the API for that, then breaking it again one day if we add more options, let's just break it once. Any boolean options we add in the future will just make use of an unused bit in the flags. Any extensions making use of tuplesorts will need to update their code to pass TUPLESORT_RANDOMACCESS instead of true for randomAccess. TUPLESORT_NONE can be used for a set of empty options. Author: David Rowley Reviewed-by: Justin Pryzby Discussion: https://postgr.es/m/CAApHDvoH4ASzsAOyHcxkuY01Qf%2B%2B8JJ0paw%2B03dk%2BW25tQEcNQ%40mail.gmail.com
* Update copyright for 2022Bruce Momjian2022-01-07
| | | | Backpatch-through: 10
* Make nodeSort.c use Datum sorts for single column sortsDavid Rowley2021-07-22
| | | | | | | | | | | | | | | Datum sorts can be significantly faster than tuple sorts, especially when the data type being sorted is a pass-by-value type. Something in the region of 50-70% performance improvements appear to be possible. Just in case there's any confusion; the Datum sort is only used when the targetlist of the Sort node contains a single column, not when there's a single column in the sort key and multiple items in the target list. Author: Ronan Dunklau Reviewed-by: James Coleman, David Rowley, Ranier Vilela, Hou Zhijie Tested-by: John Naylor Discussion: https://postgr.es/m/3177670.itZtoPt7T5@aivenronan
* Update copyright for 2021Bruce Momjian2021-01-02
| | | | Backpatch-through: 9.5
* Implement Incremental SortTomas Vondra2020-04-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Incremental Sort is an optimized variant of multikey sort for cases when the input is already sorted by a prefix of the requested sort keys. For example when the relation is already sorted by (key1, key2) and we need to sort it by (key1, key2, key3) we can simply split the input rows into groups having equal values in (key1, key2), and only sort/compare the remaining column key3. This has a number of benefits: - Reduced memory consumption, because only a single group (determined by values in the sorted prefix) needs to be kept in memory. This may also eliminate the need to spill to disk. - Lower startup cost, because Incremental Sort produce results after each prefix group, which is beneficial for plans where startup cost matters (like for example queries with LIMIT clause). We consider both Sort and Incremental Sort, and decide based on costing. The implemented algorithm operates in two different modes: - Fetching a minimum number of tuples without check of equality on the prefix keys, and sorting on all columns when safe. - Fetching all tuples for a single prefix group and then sorting by comparing only the remaining (non-prefix) keys. We always start in the first mode, and employ a heuristic to switch into the second mode if we believe it's beneficial - the goal is to minimize the number of unnecessary comparions while keeping memory consumption below work_mem. This is a very old patch series. The idea was originally proposed by Alexander Korotkov back in 2013, and then revived in 2017. In 2018 the patch was taken over by James Coleman, who wrote and rewrote most of the current code. There were many reviewers/contributors since 2013 - I've done my best to pick the most active ones, and listed them in this commit message. Author: James Coleman, Alexander Korotkov Reviewed-by: Tomas Vondra, Andreas Karlsson, Marti Raudsepp, Peter Geoghegan, Robert Haas, Thomas Munro, Antonin Houska, Andres Freund, Alexander Kuzmenkov Discussion: https://postgr.es/m/CAPpHfdscOX5an71nHd8WSUH6GNOCf=V7wgDaTXdDd9=goN-gfA@mail.gmail.com Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
* Update copyrights for 2020Bruce Momjian2020-01-01
| | | | Backpatch-through: update all files in master, backpatch legal files through 9.4
* Update copyright for 2019Bruce Momjian2019-01-02
| | | | Backpatch-through: certain files through 9.4
* Introduce notion of different types of slots (without implementing them).Andres Freund2018-11-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upcoming work intends to allow pluggable ways to introduce new ways of storing table data. Accessing those table access methods from the executor requires TupleTableSlots to be carry tuples in the native format of such storage methods; otherwise there'll be a significant conversion overhead. Different access methods will require different data to store tuples efficiently (just like virtual, minimal, heap already require fields in TupleTableSlot). To allow that without requiring additional pointer indirections, we want to have different structs (embedding TupleTableSlot) for different types of slots. Thus different types of slots are needed, which requires adapting creators of slots. The slot that most efficiently can represent a type of tuple in an executor node will often depend on the type of slot a child node uses. Therefore we need to track the type of slot is returned by nodes, so parent slots can create slots based on that. Relatedly, JIT compilation of tuple deforming needs to know which type of slot a certain expression refers to, so it can create an appropriate deforming function for the type of tuple in the slot. But not all nodes will only return one type of slot, e.g. an append node will potentially return different types of slots for each of its subplans. Therefore add function that allows to query the type of a node's result slot, and whether it'll always be the same type (whether it's fixed). This can be queried using ExecGetResultSlotOps(). The scan, result, inner, outer type of slots are automatically inferred from ExecInitScanTupleSlot(), ExecInitResultSlot(), left/right subtrees respectively. If that's not correct for a node, that can be overwritten using new fields in PlanState. This commit does not introduce the actually abstracted implementation of different kind of TupleTableSlots, that will be left for a followup commit. The different types of slots introduced will, for now, still use the same backing implementation. While this already partially invalidates the big comment in tuptable.h, it seems to make more sense to update it later, when the different TupleTableSlot implementations actually exist. Author: Ashutosh Bapat and Andres Freund, with changes by Amit Khandekar Discussion: https://postgr.es/m/20181105210039.hh4vvi4vwoq5ba2q@alap3.anarazel.de
* Don't require return slots for nodes without projection.Andres Freund2018-11-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In a lot of nodes the return slot is not required. That can either be because the node doesn't do any projection (say an Append node), or because the node does perform projections but the projection is optimized away because the projection would yield an identical row. Slots aren't that small, especially for wide rows, so it's worthwhile to avoid creating them. It's not possible to just skip creating the slot - it's currently used to determine the tuple descriptor returned by ExecGetResultType(). So separate the determination of the result type from the slot creation. The work previously done internally ExecInitResultTupleSlotTL() can now also be done separately with ExecInitResultTypeTL() and ExecInitResultSlot(). That way nodes that aren't guaranteed to need a result slot, can use ExecInitResultTypeTL() to determine the result type of the node, and ExecAssignScanProjectionInfo() (via ExecConditionalAssignProjectionInfo()) determines that a result slot is needed, it is created with ExecInitResultSlot(). Besides the advantage of avoiding to create slots that then are unused, this is necessary preparation for later patches around tuple table slot abstraction. In particular separating the return descriptor and slot is a prerequisite to allow JITing of tuple deforming with knowledge of the underlying tuple format, and to avoid unnecessarily creating JITed tuple deforming for virtual slots. This commit removes a redundant argument from ExecInitResultTupleSlotTL(). While this commit touches a lot of the relevant lines anyway, it'd normally still not worthwhile to cause breakage, except that aforementioned later commits will touch *all* ExecInitResultTupleSlotTL() callers anyway (but fits worse thematically). Author: Andres Freund Discussion: https://postgr.es/m/20181105210039.hh4vvi4vwoq5ba2q@alap3.anarazel.de
* Post-feature-freeze pgindent run.Tom Lane2018-04-26
| | | | Discussion: https://postgr.es/m/15719.1523984266@sss.pgh.pa.us
* Allow tupleslots to have a fixed tupledesc, use in executor nodes.Andres Freund2018-02-16
| | | | | | | | | | | | | | | | | | | | | The reason for doing so is that it will allow expression evaluation to optimize based on the underlying tupledesc. In particular it will allow to JIT tuple deforming together with the expression itself. For that expression initialization needs to be moved after the relevant slots are initialized - mostly unproblematic, except in the case of nodeWorktablescan.c. After doing so there's no need for ExecAssignResultType() and ExecAssignResultTypeFromTL() anymore, as all former callers have been converted to create a slot with a fixed descriptor. When creating a slot with a fixed descriptor, tts_values/isnull can be allocated together with the main slot, reducing allocation overhead and increasing cache density a bit. Author: Andres Freund Discussion: https://postgr.es/m/20171206093717.vqdxe5icqttpxs3p@alap3.anarazel.de
* Support parallel btree index builds.Robert Haas2018-02-02
| | | | | | | | | | | | | | | | | | | | | | To make this work, tuplesort.c and logtape.c must also support parallelism, so this patch adds that infrastructure and then applies it to the particular case of parallel btree index builds. Testing to date shows that this can often be 2-3x faster than a serial index build. The model for deciding how many workers to use is fairly primitive at present, but it's better than not having the feature. We can refine it as we get more experience. Peter Geoghegan with some help from Rushabh Lathia. While Heikki Linnakangas is not an author of this patch, he wrote other patches without which this feature would not have been possible, and therefore the release notes should possibly credit him as an author of this feature. Reviewed by Claudio Freire, Heikki Linnakangas, Thomas Munro, Tels, Amit Kapila, me. Discussion: http://postgr.es/m/CAM3SWZQKM=Pzc=CAHzRixKjp2eO5Q0Jg1SoFQqeXFQ647JiwqQ@mail.gmail.com Discussion: http://postgr.es/m/CAH2-Wz=AxWqDoVvGU7dq856S4r6sJAj6DBn7VMtigkB33N5eyg@mail.gmail.com
* Update copyright for 2018Bruce Momjian2018-01-02
| | | | Backpatch-through: certain files through 9.3
* Try again to fix accumulation of parallel worker instrumentation.Robert Haas2017-12-19
| | | | | | | | | | | | | | | | | When a Gather or Gather Merge node is started and stopped multiple times, accumulate instrumentation data only once, at the end, instead of after each execution, to avoid recording inflated totals. Commit 778e78ae9fa51e58f41cbdc72b293291d02d8984, the previous attempt at a fix, instead reset the state after every execution, which worked for the general instrumentation data but had problems for the additional instrumentation specific to Sort and Hash nodes. Report by hubert depesz lubaczewski. Analysis and fix by Amit Kapila, following a design proposal from Thomas Munro, with a comment tweak by me. Discussion: http://postgr.es/m/20171127175631.GA405@depesz.com
* Provide DSM segment to ExecXXXInitializeWorker functions.Andres Freund2017-11-16
| | | | | | | | | | | | Previously, executor nodes running in parallel worker processes didn't have access to the dsm_segment object used for parallel execution. In order to support resource management based on DSM segment lifetime, they need that. So create a ParallelWorkerContext object to hold it and pass it to all InitializeWorker functions. Author: Thomas Munro Reviewed-By: Andres Freund Discussion: https://postgr.es/m/CAEepm=2W=cOkiZxcg6qiFQP-dHUe09aqTrEMM7yJDrHMhDv_RA@mail.gmail.com
* Separate reinitialization of shared parallel-scan state from ExecReScan.Tom Lane2017-08-30
| | | | | | | | | | | | | | | | | | | | | | | | | | Previously, the parallel executor logic did reinitialization of shared state within the ExecReScan code for parallel-aware scan nodes. This is problematic, because it means that the ExecReScan call has to occur synchronously (ie, during the parent Gather node's ReScan call). That is swimming very much against the tide so far as the ExecReScan machinery is concerned; the fact that it works at all today depends on a lot of fragile assumptions, such as that no plan node between Gather and a parallel-aware scan node is parameterized. Another objection is that because ExecReScan might be called in workers as well as the leader, hacky extra tests are needed in some places to prevent unwanted shared-state resets. Hence, let's separate this code into two functions, a ReInitializeDSM call and the ReScan call proper. ReInitializeDSM is called only in the leader and is guaranteed to run before we start new workers. ReScan is returned to its traditional function of resetting only local state, which means that ExecReScan's usual habits of delaying or eliminating child rescan calls are safe again. As with the preceding commit 7df2c1f8d, it doesn't seem to be necessary to make these changes in 9.6, which is a good thing because the FDW and CustomScan APIs are impacted. Discussion: https://postgr.es/m/CAA4eK1JkByysFJNh9M349u_nNjqETuEnY_y1VUc_kJiU0bxtaQ@mail.gmail.com
* Propagate sort instrumentation from workers back to leader.Robert Haas2017-08-29
| | | | | | | | | | | | | | | | Up until now, when parallel query was used, no details about the sort method or space used by the workers were available; details were shown only for any sorting done by the leader. Fix that. Commit 1177ab1dabf72bafee8f19d904cee3a299f25892 forced the test case added by commit 1f6d515a67ec98194c23a5db25660856c9aab944 to run without parallelism; now that we have this infrastructure, allow that again, with a little tweaking to make it pass with and without force_parallel_mode. Robert Haas and Tom Lane Discussion: http://postgr.es/m/CA+Tgmoa2VBZW6S8AAXfhpHczb=Rf6RqQ2br+zJvEgwJ0uoD_tQ@mail.gmail.com
* Move ExecProcNode from dispatch to function pointer based model.Andres Freund2017-07-30
| | | | | | | | | | | | | | | | | | | | | | This allows us to add stack-depth checks the first time an executor node is called, and skip that overhead on following calls. Additionally it yields a nice speedup. While it'd probably have been a good idea to have that check all along, it has become more important after the new expression evaluation framework in b8d7f053c5c2bf2a7e - there's no stack depth check in common paths anymore now. We previously relied on ExecEvalExpr() being executed somewhere. We should move towards that model for further routines, but as this is required for v10, it seems better to only do the necessary (which already is quite large). Author: Andres Freund, Tom Lane Reported-By: Julien Rouhaud Discussion: https://postgr.es/m/22833.1490390175@sss.pgh.pa.us https://postgr.es/m/b0af9eaa-130c-60d0-9e4e-7a135b1e0c76@dalibo.com
* Move interrupt checking from ExecProcNode() to executor nodes.Andres Freund2017-07-30
| | | | | | | | | | | | | | | | | In a followup commit ExecProcNode(), and especially the large switch it contains, will largely be replaced by a function pointer directly to the correct node. The node functions will then get invoked by a thin inline function wrapper. To avoid having to include miscadmin.h in headers - CHECK_FOR_INTERRUPTS() - move the interrupt checks into the individual executor routines. While looking through all executor nodes, I noticed a number of arguably missing interrupt checks, add these too. Author: Andres Freund, Tom Lane Reviewed-By: Tom Lane Discussion: https://postgr.es/m/22833.1490390175@sss.pgh.pa.us
* Allow avoiding tuple copy within tuplesort_gettupleslot().Andres Freund2017-04-06
| | | | | | | | | | | | | | | | | | | | | | Add a "copy" argument to make it optional to receive a copy of caller tuple that is safe to use following a subsequent manipulating of tuplesort's state. This is a performance optimization. Most existing tuplesort_gettupleslot() callers are made to opt out of copying. Existing callers that happen to rely on the validity of tuple memory beyond subsequent manipulations of the tuplesort request their own copy. This brings tuplesort_gettupleslot() in line with tuplestore_gettupleslot(). In the future, a "copy" tuplesort_getdatum() argument may be added, that similarly allows callers to opt out of receiving their own copy of tuple. In passing, clarify assumptions that callers of other tuplesort fetch routines may make about tuple memory validity, per gripe from Tom Lane. Author: Peter Geoghegan Discussion: CAM3SWZQWZZ_N=DmmL7tKy_OUjGH_5mN=N=A6h7kHyyDvEhg2DA@mail.gmail.com
* Update copyright via script for 2017Bruce Momjian2017-01-03
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* Reuse abbreviated keys in ordered [set] aggregates.Robert Haas2016-02-17
| | | | | | | | | When processing ordered aggregates following a sort that could make use of the abbreviated key optimization, only call the equality operator to compare successive pairs of tuples when their abbreviated keys were not equal. Peter Geoghegan, reviewd by Andreas Karlsson and by me.
* Update copyright for 2016Bruce Momjian2016-01-02
| | | | Backpatch certain files through 9.1
* pgindent run for 9.5Bruce Momjian2015-05-23
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* Use outerPlanState macro instead of referring to leffttree.Robert Haas2015-05-04
| | | | | | | This makes the executor code more consistent. It also removes an apparently superfluous NULL test in nodeGroup.c. Qingqing Zhou, reviewed by Tom Lane, and further revised by me.
* Update copyright for 2015Bruce Momjian2015-01-06
| | | | Backpatch certain files through 9.0
* Update copyright for 2014Bruce Momjian2014-01-07
| | | | | Update all files in head, and files COPYRIGHT and legal.sgml in all back branches.
* Update copyrights for 2013Bruce Momjian2013-01-01
| | | | | Fully update git head, and update back branches in ./COPYRIGHT and legal.sgml files.
* Update copyright notices for year 2012.Bruce Momjian2012-01-01
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* Per-column collation supportPeter Eisentraut2011-02-08
| | | | | | | | This adds collation support for columns and domains, a COLLATE clause to override it per expression, and B-tree index support. Peter Eisentraut reviewed by Pavel Stehule, Itagaki Takahiro, Robert Haas, Noah Misch
* Stamp copyrights for year 2011.Bruce Momjian2011-01-01
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* Remove cvs keywords from all files.Magnus Hagander2010-09-20
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* Make NestLoop plan nodes pass outer-relation variables into their innerTom Lane2010-07-12
| | | | | | | | | | | | relation using the general PARAM_EXEC executor parameter mechanism, rather than the ad-hoc kluge of passing the outer tuple down through ExecReScan. The previous method was hard to understand and could never be extended to handle parameters coming from multiple join levels. This patch doesn't change the set of possible plans nor have any significant performance effect, but it's necessary infrastructure for future generalization of the concept of an inner indexscan plan. ExecReScan's second parameter is now unused, so it's removed.
* Update copyright for the year 2010.Bruce Momjian2010-01-02
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* Remove no-longer-needed ExecCountSlots infrastructure.Tom Lane2009-09-27
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* Revert DTrace patch from Robert LorBruce Momjian2009-04-02
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* Add support for additional DTrace probes.Bruce Momjian2009-04-02
| | | | Robert Lor
* Update copyright for 2009.Bruce Momjian2009-01-01
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* Update copyrights in source tree to 2008.Bruce Momjian2008-01-01
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* Teach tuplesort.c about "top N" sorting, in which only the first N tuplesTom Lane2007-05-04
| | | | | | | | | | need be returned. We keep a heap of the current best N tuples and sift-up new tuples into it as we scan the input. For M input tuples this means only about M*log(N) comparisons instead of M*log(M), not to mention a lot less workspace when N is small --- avoiding spill-to-disk for large M is actually the most attractive thing about it. Patch includes planner and executor support for invoking this facility in ORDER BY ... LIMIT queries. Greg Stark, with some editorialization by moi.
* Support ORDER BY ... NULLS FIRST/LAST, and add ASC/DESC/NULLS FIRST/NULLS LASTTom Lane2007-01-09
| | | | | | | | | | | | per-column options for btree indexes. The planner's support for this is still pretty rudimentary; it does not yet know how to plan mergejoins with nondefault ordering options. The documentation is pretty rudimentary, too. I'll work on improving that stuff later. Note incompatible change from prior behavior: ORDER BY ... USING will now be rejected if the operator is not a less-than or greater-than member of some btree opclass. This prevents less-than-sane behavior if an operator that doesn't actually define a proper sort ordering is selected.
* Update CVS HEAD for 2007 copyright. Back branches are typically notBruce Momjian2007-01-05
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