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authorTom Lane <tgl@sss.pgh.pa.us>2013-12-10 16:10:17 -0500
committerTom Lane <tgl@sss.pgh.pa.us>2013-12-10 16:10:17 -0500
commit9ec6199d18d6235cc4b4d5e4e8986e73b55b14d8 (patch)
treef2ad089b6b8dc6bd84214bca2328fdbb8f212c42 /src/backend/commands/trigger.c
parent53685d79813a46c7e3a46ae4b1210f608d41d6ab (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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