IS_NOT_NULL() does not always add enough parentheses to the compiled SQL

[kblomster]

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Describe the bug Consider this Jet statement:

postgres.SELECT(postgres.Bool(true).EQ(postgres.String("foo").IS_NOT_NULL()))

It compiles to

SELECT TRUE::boolean = 'foo'::text IS NOT NULL;

Which, when you run it in Postgres, results in this error:

[42883] ERROR: operator does not exist: boolean = text
Hint: No operator matches the given name and argument types. You might need to add explicit type casts.
Position: 22

We get the error because the = operator has higher precedence than IS [NOT] NULL, so the expression gets parsed like this:

SELECT (TRUE::boolean = 'foo'::text) IS NOT NULL;

Environment (please complete the following information):

• OS: macosx
• Database: postgres 14
• Database driver: pgx
• Jet version: 2.13.0

Expected behavior Jet knew what we meant. The .EQ() method was expecting a BoolExpression and we gave it a BoolExpression, so I would have expected the query compiler to put parens around that expression:

SELECT TRUE::boolean = ('foo'::text IS NOT NULL);