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is using mark/restore but not rewind or backward-scan capability. Insert a materialize plan node between a mergejoin and its inner child if the inner child is a sort that is expected to spill to disk. The materialize shields the sort from the need to do mark/restore and thereby allows it to perform its final merge pass on-the-fly; while the materialize itself is normally cheap since it won't spill to disk unless the number of tuples with equal key values exceeds work_mem. Greg Stark, with some kibitzing from Tom Lane. |
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bootstrap | ||
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commands | ||
executor | ||
lib | ||
libpq | ||
main | ||
nodes | ||
optimizer | ||
parser | ||
po | ||
port | ||
postmaster | ||
regex | ||
rewrite | ||
storage | ||
tcop | ||
utils | ||
Makefile | ||
nls.mk |