Function assign_expr_collations

src/backend/parser/parse_collate.c:176–189

* assign_expr_collations() * Mark all nodes in the given expression tree with collation information. * * This is exported for the benefit of various utility commands that process * expressions without building a complete Query. It should be applied after * calling transformExpr() plus any expression-modifying operations such as * coerce_to_boolean(). */

 * coerce_to_boolean().
 */
void
assign_expr_collations(ParseState *pstate, Node *expr)
{
	assign_collations_context context;

	/* initialize context for tree walk */
	context.pstate = pstate;
	context.collation = InvalidOid;
	context.strength = COLLATE_NONE;
	context.location = -1;

	/* and away we go */
	(void) assign_collations_walker(expr, &context);
}

/*
 * select_common_collation()