Revise nodeMergejoin in light of example provided by Guillaume Smet.

Browse Source

When one side of the join has a NULL, we don't want to uselessly try
to match it against every remaining tuple of the other side.  While
at it, rewrite the comparison machinery to avoid multiple evaluations
of the left and right input expressions and to use a btree comparator
where available, instead of double operator calls.  Also revise the
state machine to eliminate redundant comparisons and hopefully make it
more readable too.

...

This commit is contained in:

Tom Lane

2005-05-13 21:20:16 +00:00

parent 2979334d47

commit 184e7a73a5

4 changed files with 679 additions and 535 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download Patch File Download Diff File Expand all files Collapse all files

1145

src/backend/executor/nodeMergejoin.c

File diff suppressed because it is too large Load Diff