| commit | 30809c5bcd54ae20076dc3fc12cc923a0e28960a | |
| author | tgl <tgl> | |
| Wed, 25 Feb 2009 03:30:38 +0000 (25 03:30 +0000) | ||
| committer | tgl <tgl> | |
| Wed, 25 Feb 2009 03:30:38 +0000 (25 03:30 +0000) | ||
| tree | c65be559b8cd4e4eccbe5b1983b1ecd79c435b3b | treesnapshot (tar.gz zip) |
| parent | 23e1d1a0f2f465a4eea3aa86630c3bc223f744ea | commitdiff |
Get rid of the rather fuzzily defined FlattenedSubLink node type in favor of
making pull_up_sublinks() construct a full-blown JoinExpr tree representation
of IN/EXISTS SubLinks that it is able to convert to semi or anti joins.
This makes pull_up_sublinks() a shade more complex, but the gain in semantic
clarity is worth it. I still have more to do in this area to address the
previously-discussed problems, but this commit in itself fixes at least one
bug in HEAD, as shown by added regression test case.
making pull_up_sublinks() construct a full-blown JoinExpr tree representation
of IN/EXISTS SubLinks that it is able to convert to semi or anti joins.
This makes pull_up_sublinks() a shade more complex, but the gain in semantic
clarity is worth it. I still have more to do in this area to address the
previously-discussed problems, but this commit in itself fixes at least one
bug in HEAD, as shown by added regression test case.
18 files changed: