Comment 1991 added to page indexes.html of version 7.4

Author: Andrew Droffner <adroffne@advance.net>
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Andrew Nurcahya's comment above applies to any SQL plan.

The Postgres server's parser seems to choose a constant's datatype out-of-context. The string [1234] is SQL text is an
INTEGERto the planner. A ['1234'] with quotes is text, and gets properly cast to BIGINT to match the left-side of
[item_number=1234].

It looks like the server plans BEFORE it promotes constants to the right datatype.

A PREPAREd statment should find the index too. It requires the datatypes of parameters to be declared.
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Manual page: http://wwwmaster.postgresql.org/docs/7.4/interactive/indexes.html
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