[BUGS] BUG #14524: Commands compare with nested subquery expressions failwith "should not reference subplan var"

The following bug has been logged on the website:

Bug reference:      14524
Logged by:          Wei Congrui
Email address:      crvv.mail@gmail.com
PostgreSQL version: 9.6.1
Operating system:   Linux
Description:

SQLs which do not work are
SELECT '1' IN (SELECT (SELECT '1'::BOOL))
SELECT '1' = ANY (SELECT (SELECT '1'::BOOL))
SELECT '1' = ALL (SELECT (SELECT '1'::BOOL))
SELECT '1' = ALL (SELECT (SELECT '1'::TEXT))
SELECT '1' = ALL (SELECT (SELECT '1'::INT))

Similar SQLs but work are
SELECT '1' IN (SELECT (SELECT '1'::INT))
SELECT '1' = ANY (SELECT (SELECT '1'::TEXT))

Error message is "plan should not reference subplan's variable".

With all other majar verions, I can get the right result.

I reproduced it on Travis. https://travis-ci.org/crvv/pg


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