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author | Tom Lane <tgl@sss.pgh.pa.us> | 2013-12-10 16:10:20 -0500 |
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committer | Tom Lane <tgl@sss.pgh.pa.us> | 2013-12-10 16:10:20 -0500 |
commit | 9d2e07fecd4bd37fc9e231bd706bc0c9ce0f17a7 (patch) | |
tree | 854ca0c45dc2707e148b92360fe4772b1fcd1cd6 /src/tutorial/complex.c | |
parent | 0ec530625f1cc0a17d975f925fed5d3ab469c6f8 (diff) | |
download | postgresql-9d2e07fecd4bd37fc9e231bd706bc0c9ce0f17a7.tar.gz postgresql-9d2e07fecd4bd37fc9e231bd706bc0c9ce0f17a7.zip |
Fix possible crash with nested SubLinks.
An expression such as WHERE (... x IN (SELECT ...) ...) IN (SELECT ...)
could produce an invalid plan that results in a crash at execution time,
if the planner attempts to flatten the outer IN into a semi-join.
This happens because convert_testexpr() was not expecting any nested
SubLinks and would wrongly replace any PARAM_SUBLINK Params belonging
to the inner SubLink. (I think the comment denying that this case could
happen was wrong when written; it's certainly been wrong for quite a long
time, since very early versions of the semijoin flattening logic.)
Per report from Teodor Sigaev. Back-patch to all supported branches.
Diffstat (limited to 'src/tutorial/complex.c')
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