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Support MergeAppend plans, to allow sorted output from append relations.

author Tom Lane <tgl@sss.pgh.pa.us>

2010年10月14日 20:56:39 +0000 (16:56 -0400)

committer Tom Lane <tgl@sss.pgh.pa.us>

2010年10月14日 20:57:57 +0000 (16:57 -0400)

commit 11cad29c91524aac1d0b61e0ea0357398ab79bf8

tree ec9053dfee621437146f29ce20904a9949b3f2ae tree

parent 30e749dece0e6502d4dd0a3b2892eab61f8c073b commit | diff

Support MergeAppend plans, to allow sorted output from append relations.

This patch eliminates the former need to sort the output of an Append scan
when an ordered scan of an inheritance tree is wanted. This should be
particularly useful for fast-start cases such as queries with LIMIT.

Original patch by Greg Stark, with further hacking by Hans-Jurgen Schonig,
Robert Haas, and Tom Lane.

26 files changed:

src/backend/commands/explain.c diff | blob | blame | history

src/backend/executor/Makefile diff | blob | blame | history

src/backend/executor/execAmi.c diff | blob | blame | history

src/backend/executor/execCurrent.c diff | blob | blame | history

src/backend/executor/execProcnode.c diff | blob | blame | history

src/backend/executor/nodeMergeAppend.c [new file with mode: 0644] blob

src/backend/nodes/copyfuncs.c diff | blob | blame | history

src/backend/nodes/outfuncs.c diff | blob | blame | history

src/backend/optimizer/README diff | blob | blame | history

src/backend/optimizer/path/allpaths.c diff | blob | blame | history

src/backend/optimizer/path/costsize.c diff | blob | blame | history