Anthony Ogier commented on Bug HHH-6913

If I read the spec (JPA 2.0, p.149)

4.6.9 In Expressions

The syntax for the use of the comparison operator [NOT] IN in a conditional expression is as follows:

in_expression ::=
	{state_field_path_expression | type_discriminator} [NOT] IN
		{ ( in_item {, in_item}* ) | (subquery) | collection_valued_input_parameter }
in_item ::= literal | single_valued_input_parameter

So if I correctly understand that expression, collection_valued_input_parameter is allowed without parenthesis around... am I wrong ?
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