Parentheses put around IS NULL only if operand is of type boolean (6.0)

[roji]

#25722 fixed #23990 by adding parentheses around IS NULL/IS NOT NULL, preventing operator precedence issues. However, it did so only when the operand of IS NULL is a bool. However, the same problem can happen if a non-bool column is being checked for null.

See npgsql/efcore.pg#2090 on PostgreSQL where the following LINQ query:

var boolParam = true;
_ = ctx.Blogs.Where(c => boolParam != c.NullableGuid.HasValue).ToList();

... generates the following SQL ...

SELECT b."Id", b."NullableGuid"
FROM "Blogs" AS b
WHERE @__boolParam_0 <> b."NullableGuid" IS NOT NULL

... which fails with operator does not exist: boolean <> uuid, because in PostgreSQL the precedence of <> is higher than the precedence of IS NOT NULL (docs). The issue also causes wrong data to be returned in Sqlite.

[ajcvickers]

@roji You put servicing-consider on this. Are you planning to get it into 6.0.1?