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authorTom Lane <tgl@sss.pgh.pa.us>2013-12-10 16:10:20 -0500
committerTom Lane <tgl@sss.pgh.pa.us>2013-12-10 16:10:20 -0500
commit9d2e07fecd4bd37fc9e231bd706bc0c9ce0f17a7 (patch)
tree854ca0c45dc2707e148b92360fe4772b1fcd1cd6 /src/tutorial/complex.c
parent0ec530625f1cc0a17d975f925fed5d3ab469c6f8 (diff)
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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.
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