PostgreSQL - max aantal parameters in IN-clausule?

Volgens de broncode die hier te vinden is, vanaf regel 850, beperkt PostgreSQL het aantal argumenten niet expliciet.

Het volgende is een codecommentaar van regel 870:

/*
 * We try to generate a ScalarArrayOpExpr from IN/NOT IN, but this is only
 * possible if the inputs are all scalars (no RowExprs) and there is a
 * suitable array type available.  If not, we fall back to a boolean
 * condition tree with multiple copies of the lefthand expression.
 * Also, any IN-list items that contain Vars are handled as separate
 * boolean conditions, because that gives the planner more scope for
 * optimization on such clauses.
 *
 * First step: transform all the inputs, and detect whether any are
 * RowExprs or contain Vars.
 */